Got Nature? Blog

Step into the woods and into the legacy of sustainable forestry with a full-day field tour of the Goetsch property in Beloit, Wisconsin—one of the highlights of this year’s Walnut Council National Meeting. This unique site, donated to the Council in 2019, showcases nearly a century of hardwood forest management, including majestic walnut trees planted in the 1930s and thousands of younger trees carefully cultivated over the past four decades.

Participants will explore hands-on demonstrations in crop tree release, regeneration planting, drone-assisted monitoring, and sawmilling. The tour includes bus transportation, lunch, and expert-led discussions on real-world forestry practices in action.

Connect, Learn, and Share at the National Meeting in Rockford, Illinois
The full program runs Sunday, July 27 through Tuesday, July 29 at the Hilton Garden Inn Rockford Conference Center, offering a rich mix of networking, education, and inspiration:

• Sunday evening kicks off with a welcoming dinner and informal “Landowner Show & Tell,” where members share personal stories, tips, and lessons learned.
• Monday features the Goetsch property field tour, followed by an evening banquet with a keynote by Illinois State Forester Kenneth Jolly.
• Tuesday brings a full day of indoor programming, including expert presentations on hardwood management, roundtable discussions, and a landowner panel.

Companion tours are also available, including visits to Anderson Japanese Garden and Midway Village Museum.

Whether you’re a seasoned forester, a new landowner, or simply passionate about sustainable hardwood management, this event offers something for everyone. Register for the full event or individual days, and don’t forget to book your hotel by June 28 to receive the special group rate.

View the Meeting Agenda

Meeting Registration Page

This program will be submitted for CFE credits from Society of American Foresters.

Questions? Call 765-496-5013 or email walnutcouncil@gmail.com.

About the Walnut Council:
Founded in 1970, the Walnut Council is an international association representing nearly 700 woodland owners, foresters, forest scientists, and wood-producing industry representatives in 45 states and three foreign countries. The purpose is to assist in the technical transfer of forest research to field applications, help build and maintain better markets for wood products and nut crops, and to promote sustainable forest management, conservation, reforestation, and utilization of American black walnut (Juglans nigra) and other high quality fine hardwoods.

Resources:
Indiana Forestry & Woodland Owners Association (IFWOA) YouTube Channel
Deer Impact Toolbox, Purdue Extension Pond and Wildlife Management
Grassland Management, Purdue Extension Pond and Wildlife Management
District Forester, Indiana DNR Division of Forestry, for over 10 acres of woodlands
Directory of Professional Foresters, Indiana Forestry & Woodland Owners Association (IFWOA)
Indiana Woodland Steward E-newsletters, Eleven Member Organization
A Woodland Management Moment, Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
Forest Improvement Handbook, The Education Store
Invasive Species, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Invasive Plant Species Identification, Video, Purdue Extension – FNR YouTube Channel
Report Invasive Species, Purdue Invasive Species
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Subscribe – Purdue Extension-FNR YouTube Channel

Liz Jackson, IFWOA Engagement Specialist & Walnut Council Manager
Indiana Forestry & Woodlands Owners Association (IFWOA)

Welcome to ID That Tree! In this episode, Purdue Extension Forester Lenny Farlee introduces us to a relatively common Indiana shrub called Witch-Hazel. Discover the characteristics of the environment this shrub is found in, the features of the shrub itself and the interesting history behind it! As a nature lover, student or someone who’s simply just curious about local plants, this video is a great way to get a quick run-down on important information and identification.

If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Indiana Department of Natural Resources: Invasive Species
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
101 Trees in Indiana, Amazon
Habitat University, Episode 12 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Native Trees of the Midwest, Purdue University Press
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Find an Arborist, International Society of Arboriculture
Forest Improvement Handbook, The Education Store

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources

In recognition of Pollinator Week June 16-22, 2025, let’s see what is blooming at Purdue FNR Tippecanoe County property, Martell Forest.

More about Pollinator Week: this is an annual celebration in support of pollinator health that was initiated and is managed by Pollinator Partnership. It is a time to raise awareness for pollinators and spread the word about what we can do to protect them. Pollinators include bees, butterflies, beetles, moths, wasps, hummingbirds, bats, flies, beetles, lizards, rodents and more.

Resources:
Ask an Expert: What’s Buzzing or Not Buzzing About Pollinators, Purdue Extension – Forestry & Natural Resources (FNR) YouTube Channel
Pollinator Conservation Education, Purdue Extension – Entomology
What’s buzzing in your backyard? Learn about protecting pollinators, beekeeping with Purdue Extension, Purdue Extension News
Indiana Monarch and Pollinator Conservation website
Protecting Pollinators: Protecting Pollinators in Home Lawns and Landscapes, publication, The Education Store, Purdue Extension’s resource center
Consider Pollinators When Planning Your Garden, Got Nature? Blog, Purdue Extension – FNR
Pollinator Conservation Education, Purdue Entomology
Recommended Indiana-Native Plants for Attracting Pollinators (pdf), Purdue Extension – Entomology
Attract Hummingbirds to Your Yard video, Purdue Extension – FNR YouTube Channel
Protecting Pollinators: Biology and Control of Varroa Mites in Bee Hives, The Education Store, Purdue Extension resource center
Gardening for Pollinators, Purdue Garden Articles
Subscribe Purdue Extension-Forestry and Natural Resources YouTube Channel

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources

Figure 1: Examples of volcano mulching (PLR)

Purdue Landscape Report: Tree care, in many cases, can be expensive if you require the assistance of an arborist for pruning or removals.  Extreme weather events, characterized by extensive rain and wind, can cause damage to the canopy or, in worst-case scenarios, lead to tree failure.  In cases of failures, weather is often the final push to already existing issues.  One cause that can lead to decay, decline, and failure if applied incorrectly can also extend the life of your tree with proper application.

Mulch is the double-edged sword that can promote healthy growth by maintaining soil moisture and temperature through extreme heat, cold, and drought, enrich the soil in the critical root zone, maintain a safety area from mechanical damage from lawn care tools, and add a nice aesthetic.

Figure 2: Digging out and exposing the root flare (PLR)

But it can also cause decay through excess moisture to the root flare, damage from pests like mice and insects that can live in mulch, expose the tree to pathogens, and promote unnecessary root growth and/or stem girdling roots that cut off nutrient supply between the root system and the rest of the tree.

The application is the same if it’s the first time mulching a tree or a re-application.  Add enough mulch so there is a 2–3-inch layer sloping away from the tree with at least a 3–5-foot radius around the stem (older, larger trees can benefit from larger mulch rings).  No volcano mulching, make sure you also have around a 1-2-inch gap between the stem and the start of the mulch ring.

Figure 3: Creating a 1–2-inch space between the root flare and the mulch.

If you are reapplying mulch, first rake the old mulch to even the layer and mix some into the soil if possible.  If your tree has already been mulched and has been volcano mulched, simply dig out the excess, exposing the root flare and creating that 1-2-inch gap between the stem and the mulch.

This simple act is relatively inexpensive, does not require a lot of time, and will help keep your tree healthy, extending its life.  If you notice any other issues with your trees, hiring an ISA Certified arborist is the next step in managing your trees’ health.  To find an arborist near you and verify credentials, use the link at Find an Arborist, Trees are Good, International Society of Arboriculture (ISA).

View the original article on the Purdue Landscape Report website: Simple Steps to Care for Your Tree: Mulching.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Re-mulch Your Trees, Purdue Landscape Report
Find an Arborist video, Trees are Good-International Society of Arboriculture (ISA)
Trees and Storms – The Education Store, Purdue Education’s resource center
Moist soil and rotten roots makes it easy for trees to come crashing down – Fox 59 News
Expert: Some storm damage can be easily prevented – Fox 59
Why Is My Tree Dying? – The Education Store
Tree Risk Management – The Education Store
Tree Pruning Essentials, Publication & Video, The Education Store
Mechanical Damage to Trees: Mowing and Maintenance Equipment – The Education Store
Trees and Electric Lines – The Education Store
Tree Defect Identification, The Education Store
Planting Your Tree, video, Purdue Extension
Tree Installation, The Education Store
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Subscribe – Purdue Extension-FNR YouTube Channel

Ben McCallister, Urban Forestry Specialist
Purdue Forestry & Natural Resources

Welcome to ID That Tree! In this episode, Purdue Extension Forester Lenny Farlee introduces Coralberry, a small native Indiana shrub also known as Buckbrush. Learn how it got its name, what makes its leaves unique and where it typically grows. Whether you’re a nature lover, student or just curious about local plant life, this quick and informative video is a great way to expand your knowledge of Indiana’s native shrubs.

If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Indiana Department of Natural Resources: Invasive Species
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
101 Trees in Indiana, Amazon
Habitat University, Episode 12 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
Native Trees of the Midwest, The Education Store
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Find an Arborist, International Society of Arboriculture
Forest Improvement Handbook, The Education Store

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources

Discover the importance of thinning dense native warm-season grasses in conservation plantings to improve diversity. This guide explains methods to reduce tall native warm-season grasses to improve habitat for wildlife. Essential reading for conservationists and land managers interested in grassland ecosystems.

Learn when and how to thin these grasses effectively, and explore strategies that balance ecological health with long-term land management goals: Thinning Native Warm-Season Grasses

This publication is part of a seven publication series The Managing Conservation Plantings Series which include details on how to control invasive species and other problematic plants in Conservation Reserve Program (CRP) plantings and native warm-season grass and wildflower conservation plantings.

Publications in this series include:

• Golden Rod Control
• Thinning Native Warm-Season Grasses
• Sericea Lespedeza Control
• Woody Encroachment and Woody Invasives
• Johnson Grass Control
• Reed Canarygrass Control
• Teasel Control (Common and Cut Leaved)
• Controlling Introduced Cool-season Grasses
• Crownvetch, Sweetclover and Birdsfoot Trefoil Control

Resources:
Deer Impact Toolbox & Grassland Management, Purdue Extension Pond and Wildlife Management
Pond and Wildlife Management, Purdue Extension
Forestry for the Birds Virtual Tour and Pocket Guide, Got Nature? Blog, Purdue Extension – FNR
Frost Seeding to Establish Wildlife Food Plots and Native Grass and Forb Plantings – Purdue Extension – FNR YouTube channel
Wildlife Habitat Hint: Tips for Evaluating a First Year Native Grass and Forb Plantings, Purdue Extension – FNR YouTube Channel
Drone Seeding Native Grasses and Forbs: Project Overview & Drone Setup, Purdue Extension – FNR YouTube channel
Ask an Expert: Wildlife Food Plots, video, Purdue Extension – FNR YouTube Channel
Handling Harvested Game: Episode 1, Field Dressing, video, Purdue Extension – FNR YouTube Channel
Managing Your Woods for White-Tailed Deer, The Education Store
Forest Improvement Handbook, The Education Store
Forest Management for Reptiles and Amphibians: A Technical Guide for the Midwest, The Education Store
A Template for Your Wildlife Habitat Management Plan, The Education Store
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube channel
Nature of Teaching Unit 1: Animal Diversity and Tracking, The Education Store
Nature of Teaching, Purdue College of Agriculture
Invasive Species Playlist, Playlist, Purdue Extension – FNR YouTube Channel
Report Invasive, Purdue Extension
Subscribe Purdue Extension – Forestry and Natural Resources YouTube Channel

Jarred Brooke, Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

Purdue Landscape Report: Recently, there has been an uptick in questions related to one of Indiana’s most notorious invasive pests: the emerald ash borer.  Homeowners, businesses, even professionals have asked if ash trees are still present in Indiana, and if the insect is still a threat to our ecosystem.  Emerald ash borer wreaked significant havoc among Indiana’s hardwoods, and a person could be forgiven for believing that there are no ash trees at all in our state, but this is simply not true.  Ash still survives in Indiana and can be found both as ornamental plantings and in untended woodlots; unfortunately, emerald ash borer is also still present and just as deadly to them as ever.  The question of protecting ash versus removal them is complex, but entomologists and tree specialists have learned from this insect’s invasion.

Figure 1. Side view of EAB, John Obermeyer

The emerald ash borer (Agrilus planipennis), a wood-boring insect native to Asia, is responsible for decimating ash (Fraxinus spp.) throughout the United States and elsewhere.  In Indiana, this insect’s presence was confirmed in 2004, though it had probably been in the state for some time before then.  Since its arrival, Hoosiers have been forced to watch as ash trees have rapidly declined and died due to the insect’s feeding and life cycle.  The insect lays its eggs in crevices in the bark of an ash that is 8 to 10 years old, and after hatching, the new larvae begin to bore through the tree’s cambium tissue. The tree relies on its cambium tissue to transport water and nutrients and supply cells for new growth.  Often, the only signs of the insect’s presence are a reduction in canopy coverage and D-shaped exit holes in the bark, indicating adult emergence.  As time goes on, however, the tree will continue to lose canopy, experience limb death, and often have large chunks of bark detach. Unprotected trees will typically die within 2 to 5 years of infestation.  Dead and dying ash trees represent a serious hazard to health and property as infestation will leave them extremely brittle. Brittle ash will often fall during weather events or even collapse over time as limbs fall off.

While emerald ash borer did significant damage to ash tree populations in Indiana, they did not destroy the population entirely.  While virtually all untreated trees will eventually become infested, saplings with a trunk diameter of ½ to 1 inch will remain untouched, allowing annual replacement of trees to continue.  Since the initial invasion killed so many trees, the borer’s populations have been proportionally reduced as well due to a lack of a food source.  This combination of factors has created a cycle of growth and infestation that allows both populations to survive, but at significantly lower levels as compared to the period of the initial infestation.  Unfortunately, this also means that emerald ash borer is now a permanent fixture in the hardwood ecosystem in Indiana.

Figure 2. This photo illustration shows three ash trees in Bloomington, Indiana, with different levels of canopy lost to the emerald ash borer. (Purdue Tree Doctor app illustration/Cliff Sadof)

While many may believe ash trees are a total loss, there are still options to protect ash tree and even rescue ash that have already been infested.  The first step in this process is to determine the extent of damage in a given tree.  As the cambium tissue is consume by ash borer larvae, the tree will experience a steady loss of canopy and limb death.  The proportion of lost canopy makes a great indicator for treatment viability.  For example, a tree that has only lost 10% of its canopy will normally respond well to treatment.  As more canopy is lost, recovery is more challenging, until the tree has lost %30 of canopy coverage.  After that point, there is very little chance that a rescue treatment will be successful, and removal will most likely be necessary.  It is also important to remember that limb death may occur; these limbs will not recover and will need to be removed to avoid any potential hazards.

There are several insecticides with varying ranges of efficacy that can be used to manage emerald ash borer.  These include imidacloprid, dinotefuran, azadirachtin, and emamectin benzoate. Several studies have been conducted to find the best combination of chemical and application type, such as the difference between using a soil drench compared to a trunk injection. While all of the above chemicals can be effective against the insect, the combination of emamectin benzoate applied through a trunk injection offers the best, longest lasting protection from infestation.  This combination has a durable effect lasting for two years under dense infestations.  However, the reduction in emerald ash borer populations have spread the distribution of the insect thinner, and longer intervals between treatments are possible.  A ten-year study conducted by Purdue University demonstrated that treating trees once every three years provided sufficient protection from the beetles, while also showing that 4 to 5 years after last treatment coincided with an increase in damage to the trees.  This same study also found that by six years post-treatment, the trees would decline to the point of making removal a necessity.  This research concluded that increasing time between intervals after three years increased the risk of catastrophic damage due to emerald ash borer activity, thus the recommendation for three-year intervals.

Ultimately, many will see this as a financial issue: the cost of treatment over time against the cost of removal to avoid potential damages.  The above study estimated the cost of treating a single tree with an emamectin benzoate injection at $300 per treatment. Since treatment only needs to happen once every three years, the cost per year per tree would be $100, approximately.  Tree removal was estimated between $1800 and $3600, depending on tree location and other factors.  Also consider replacement costs if you wanted to continue to grow ash in that area, and how long the tree would need to grow to match the size of the tree you just replaced.  Additionally, add in any treatment costs to make sure it survives infestation.  When looked at from this angle, maintaining regular treatment on rescuable trees would appear to be the most cost-effective route for managing ash.  Any treatment plan should be discussed with a professional, such as a certified arborist.

Read the original article posted in the Purdue Landscape Report April 2025 Newsletter: Revisiting Ash Tree Protection.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
New Hope for Fighting Ash Borer, Got Nature? Purdue Extension-FNR
Invasive Pest Species: Tools for Staging and Managing EAB in the Urban Forest, Got Nature?
Emerald Ash Borer, Purdue Extension-Entomology
Emerald Ash Borer Cost Calculator – Purdue Extension Entomology
Planting Your Tree Part 1: Choosing Your Tree, Purdue Extension YouTube Channel
Tree Planting Part 2: Planting a Tree, Purdue Extension – Forestry and Natural Resources YouTube Channel
Indiana Invasive Plant List, Indiana Invasive Species Council, Purdue Entomology
Landscape Report Shares Importance of Soil Testing, Purdue FNR Extension
Find an Arborist website, Trees are Good, International Society of Arboriculture (ISA)
Tree Risk Management – The Education Store, Purdue Extension’s resource center
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Indiana Department of Natural Resources: Invasive Species
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
Native Trees of the Midwest, Purdue University Press
Professional Forester, Indiana Forestry Woodland Owners Association
Forest Improvement Handbook, The Education Store

Bob Bruner, Exotic Forest Pest Educator
Purdue Entomology

Purdue Landscape Report: Sawflies are frequent pests in the landscape that attack a wide variety of plants, from ornamental flowers to large trees. You might start to see them damaging plants around this time of year as the first generations hatch and begin to feed on foliage. They are often mistaken for caterpillars, which are the larval stages of butterflies and moths (Order Lepidoptera). However, sawflies are actually wasp-like insects (Order Hymenoptera).

Let’s review how to tell them apart. Products that are labelled for caterpillars do not always work on sawflies, so proper identification is important.

• The most reliable characteristic are the prolegs. Sawflies have 6+ pairs of prolegs, or false legs, while caterpillars have < 6 pairs of prolegs. (Fig. 1)
• When disturbed, sawflies will lift their posterior into an “S” shape. Caterpillars don’t display this behavior. (Fig. 2)

Integrated management recommendations

Early in the year, before hatching starts, look for sawfly oviposition on your plants. This will vary depending on the species of sawfly. For example, the European Pine sawfly eggs look like yellow-orange spots evenly spaced on the needles (Fig. 3). The Bristly Roseslug sawfly uses her ovipositor to cut a slit into the leaf petiole where she inserts eggs. The gooseberry sawfly lays eggs on a leaf vein (Fig. 4).

If the eggs are readily visible, manual removal will help reduce the populations. This is best accomplished in early spring before the eggs hatch. Use a tool to smash the eggs, or prune of the affected plant material.

You may not notice any problem on the plant until you start to see holes appearing in the foliage. Monitor regularly in the spring for holes and “window pane” damage (Fig. 5). This is the time of year when sawflies are hatching, so don’t wait any longer to check your plants. Sawfly management is best accomplished when the larvae are still small. Prune or shake off the larvae from the plant, or spray with a biorational material so as not to disturb natural enemies and cause a secondary pest outbreak later in the summer.

For more information on sawfly biology, check out this five-minute video: Slaying Sawflies with Purdue Plant Doctor.

Specific management recommendations can be found on the Purdue Plant Doctor website. Type “sawfly” into the search and click on the species you would like to read more about!

Read the original article on Purdue Landscape Report: Sawflies: the caterpillar pests that are not caterpillars.

Figure 1. Norway maple is an invasive species that can resemble black and sugar maple. Photo by Purdue Arboretum.

Purdue Landscape Report: These three maples have somewhat similar-looking leaves. On the surface, you may think this is simply an academic exercise. But if you care about invasive plants and local ecology, this distinction is an important one.

Norway maple is an invasive tree species, while sugar and black maples are native tree species (sometimes called hard maples). Sugar and black maples are even more beloved for their gift of delicious sugary sap that can be made into maple syrup and similar products. They also make great shade trees. Note that there are other native and non-native maple species.

One way to distinguish between Norway (Acer platanoides), sugar (Acer saccharum), and black (Acer nigrum) maples is to count the number of lobes on the leaves. Lobes are large areas of the leaf that stick out, like an ear lobe, although that is not the clearest analogy. Norway maples typically have 5-7 lobes (commonly 7), sugar maples typically have 5, and black maples typically have 3-5. Black maple’s bottom two lobes are so much less prominent than sugar maple that it often looks like 3 main lobes. Additionally, black maple leaves droop on the sides, almost like they are starting to wilt from lack of water.

Another way to distinguish Norway maples from native maples (sugar and black) is to look at the winged seeds, called samaras. Children may call these “helicopters,” as they twirl on their way to the ground. The Norway maple has paired samaras arranged like a handlebar mustache. Sugar and black maple samara pairs look more like a Fu Manchu mustache, pointing downward rather than the near horizontal arrangement of Norway maple samaras.

Figure 2c. Black maple leaf. Photo by Purdue Arboretum.

Figure 2b. Sugar maple leaf. Photo by Purdue Arboretum.

Figure 2a. Norway maple leaf. Photo by Purdue Arboretum.

A third way to distinguish Norway maples from native maples is to snap off the long leaf stem (petiole). Norway maples have a milky latex sap that exudes if you squeeze or pinch a petiole, while native maples have clear sap.

There are a few other identification nuances between these species. For example, black maples have stipules (leaf-like growths) at the base of their petioles (absent on sugar maple). They also have pubescence or hairiness on the underside of the leaves. Norway maple has hairs in the axils of leaf veins. Norway maple’s leaves are generally broader than long. Other differences may be seen in the bark, twigs, buds, and fall coloring.

Although Norway maple is an invasive species, it has been a long-time landscaping favorite of homeowners, especially cultivars like ‘Crimson King’ that retain their deep red color all year. This attribute has made Norway maple a popular choice because few other options exist to offer that color feature for the landscape. Other varieties or cultivars exhibit the normal green leaf color. Native to northern Europe, the tree was introduced in America in the late 1700s. George Washington reportedly purchased two trees in 1792 to plant at Mount Vernon.

For full article: Distinguishing Between Norway, Sugar, and Black Maples, Purdue Landscape Report.

Resources:
ReportINvasive, Purdue College of Agriculture
What are Invasive Species and Why Should I Care?, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Large Spots on Maple Leaves that Look Like Tar, Purdue Extension News
Find an Arborist, International Society of Arboriculture
Fifty Common Trees of Indiana
An Introduction to Trees of Indiana
Native Trees of the Midwest, The Education Store
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
Tree Installation: Process and Practices, The Education Store
Planting Your Tree Part 1: Choosing Your Tree, Video, Purdue Extension – Forestry & Natural Resource (FNR) YouTube Channel
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
ID That Tree, Purdue Extension-FNR YouTube playlist
Purdue Plant and Pest Diagnostic Laboratory

John E. Woodmansee, Extension Educator – Agriculture and Natural Resources (ANR)
Purdue Extension – Whitely County

The Purdue Hardwood Tree Improvement and Regeneration Center has signed a commercial partnership agreement with Tree Pro to distribute select hardwood seedlings from its breeding program beginning in March 2025.

The partnership, which will mark the HTIRC’s first commercial release of seedlings in its 25-year history, will see West Lafayette, Ind., based Tree Pro distribute bare root seedlings of six species across its timber select, conservation and wildlife lines. Timber select varieties will include black walnut, black cherry, northern red oak, white oak and pure and hybrid butternut. Conservation species include pure butternut and American chestnut. The wildlife line will feature select precocious white oak.

The HTIRC collection is available for purchase now on the Tree Pro website. Delivery of the seedlings is set for March 2025.

For over five decades, Purdue University and the HTIRC have assembled, tested and selected populations of Indiana’s most valuable hardwood tree species (black cherry, black walnut, northern red oak and white oak) for deployment across the Midwest’s Central Hardwood Forest region. Populations of all four species have been selected for stem straightness and growth rate and are under continuous improvement as breeders remove underperforming clones and seedlings from seed production areas.

Today, as a product of the HTIRC’s efforts, numerous progeny tests, grafted clone banks and orchards exist at Purdue properties across Indiana and are now producing commercial quantities of seed for distribution.  A commercial partnership with Tree Pro now gives the HTIRC an outlet to distribute its hardwood trees to landowners throughout the Central Hardwood Forest Region.

“Tree Pro’s established reputation with conservation groups, private landowners and foresters makes them an ideal distributor of the HTIRC’s select material,” said Matt Ginzel, director of the HTIRC. “We want to make it clear that this partnership will not take away from our existing relationship to provide seeds and seedlings to the Indiana Department of Natural Resources. This simply gives us another avenue to get our material into the hands of the public and to achieve our goal of increasing the value and resilience of woodlands by enriching the diversity of seedlings available for reforestation efforts.”

Tree Pro has been in business for 37 years and is known for its tree protection products (Miracle Tube) and lines of fruit and nut trees oriented to hunters and wildlife enthusiasts.

“When we were approached about the opportunity to distribute genetically diverse select hardwood seedlings from the HTIRC, we were instantly excited,” said Tommy Mills, co-owner of Tree Pro. “It brings our start as a company with black walnuts full circle.”

In addition to making selections on four major hardwood species, the HTIRC has been working to preserve and develop disease-resistant populations of two endangered native fine hardwood species –  butternut and American chestnut.

After more than 20 years of work, the HTIRC now possesses the most diverse collection of butternut in the United States, and has made significant advances in breeding butternuts resistant to the deadly butternut canker fungus. The HTIRC’s canker-resistant butternut program utilizes both pure butternut and hybrids between the butternut (Juglans cinerea) and the Japanese walnut (Juglans ailantifolia), with a program goal of decreasing the proportion of Japanese walnut genetics in the population while increasing overall canker resistance. A collection of pure, disease susceptible butternuts also is maintained for research purposes, and provides valuable seed for organizations and individuals that prefer pure butternut over hybrid butternut.

The American chestnut, once the backbone of timber production for all uses in the eastern United States and a prolific producer of nuts for animals and humans alike, is now functionally extinct due to the accidental introduction of the chestnut blight fungus in 1904. In collaboration with the American Chestnut Foundation and other entities, the HTIRC has assembled an American chestnut collection that represents pure American chestnuts from Indiana and neighboring states. It stands as one of the few grafted American chestnut collections in the country. While currently unavailable for public release, the HTIRC’s ongoing efforts to breed a blight-resistant American chestnut encompasses the use of both interspecific hybrid breeding and biotechnology to restore a long-lost forest species.

“The mother trees for HTIRC’s Timber Select lines were all selected for straight stems with few defects like low forks that can negatively impact standing timber value, while the Timber Select butternuts were selected for their resistance to butternut canker disease,” said Caleb Kell, operational tree breeder for the HTIRC. “Landowners have a good chance of getting similar characteristics out of their seedlings if they are planted on suitable soils with deer protection, which is one of Tree Pro’s specialties.”

Here is a quick list of what is available for purchase:

• HTIRC Timber Select Black Walnut
• HTIRC Timber Select Black Cherry
• HTIRC Timber Select Northern Red Oak
• HTIRC Timber Select White Oak
• HTIRC Timber Select Pure and Hybrid Butternut
• HTIRC Conservation Pure Butternut
• HTIRC Conservation American Chestnut
• HTIRC Wildlife Select Precocious White Oak

View full article with descriptions of seedlings available along with additional photos, Purdue Forestry and Natural Resources News & Stories: HTIRC Partners with Tree Pro to Distribute Hardwood Seedlings.

Other resources:
Forestry & Natural Resources
Tropical HTIRC
An Introduction to Trees of Indiana, The Education Store, Purdue Extension resource center
Native Trees of the Midwest, Purdue University Press
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
ID That Tree, Playlist, Subscribe to Purdue Extension – Forestry and Natural Resources YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
Finding help from a professional forester, Indiana Forestry & Woodland Owners Association
District Forester, Indiana DNR Division of Forestry, for over 10 acres of woodlands
Directory of Professional Foresters, Indiana Forestry & Woodland Owners Association (IFWOA)

Wendy Mayer, FNR Communications Coordinator
Purdue University Department of Forestry and Natural Resources