Got Nature? Blog

Purdue Landscape Report: Fall is one of my favorite times of year. The temperatures begin to cool, the humidity drops, and the landscape starts its annual transformation as trees trade their summer greens for shades of yellow, orange, and red. For those of us who enjoy spending time outdoors, it can also be one of the most pleasant times of year to work in the landscape.

As fall approaches, one question I frequently hear is:
“Is fall a good time to plant a tree?” The answer is yes!

In fact, fall can be an excellent time to add a new tree to your landscape. Cooler temperatures and decreased drought stress can make the transition from nursery to landscape less stressful for newly planted trees. As long as you select an appropriate tree, plant it correctly, and provide proper care after planting, a fall planting can give a tree an excellent start.

Why plant trees in the fall?
One of the biggest advantages of fall planting is the weather. Compared with the heat of summer, cooler fall temperatures reduce heat stress and typically lower evapotranspiration—the amount of water lost from plants and soil to the atmosphere.

Fall also shifts the tree’s priorities. Rather than putting most of its energy into producing new shoots and leaves, a deciduous tree is preparing for dormancy and continuing to develop its root system. Planting during this period can allow roots to become established before the tree has to deal with the heat and water demands of the following summer.

Of course, cooler temperatures and fall rainfall do not eliminate the need to water a newly planted tree. Newly installed trees still require regular attention while their root systems become established.

What should I consider when planting in the fall?
There are a few important considerations to keep in mind.

• Water is still important. If rainfall isn’t providing approximately 1 inch of water per week, newly planted trees will need supplemental irrigation. A useful general guideline is approximately 5 gallons of water per week for every inch of trunk diameter, although actual watering needs will vary depending on soil, weather, tree size, and site conditions. Rather than relying solely on a calendar, check the soil and adjust watering based on conditions.
• Don’t forget to mulch. Apply a layer of organic mulch over the root zone to help conserve soil moisture and moderate soil temperatures. Keep mulch away from direct contact with the trunk—avoid creating the familiar “mulch volcano” around the base of the tree.
• Give the tree time to establish. Ideally, trees should be planted early enough in the fall to allow their roots to become established before the ground freezes. A common recommendation is to allow approximately six weeks between planting and the first hard freeze.
• Choose the right tree for the site. Fall is a good planting season, but it doesn’t make a poorly matched tree a good choice.
• Consider the mature size of the tree, available growing space, soil conditions, sunlight, drainage, and other site characteristics before making your selection.Think about winter protection. Some trees, particularly broadleaf evergreens, may be more susceptible to winter injury because they continue to lose moisture through their leaves when the ground is frozen and roots cannot readily replace that water. Newly planted trees may also benefit from protection against trunk damage from wildlife or winter sun exposure, depending on the species and site.

Give your tree a good start
Planting a tree is a long-term investment. The work you put into selecting, planting, watering, and caring for a tree during its first few years can have a significant impact on its future health and structure.

So, if you’ve been waiting for cooler weather to add a tree to your landscape, fall can be a great time to get planting. Choose the right tree for the right place, plant it properly, and don’t forget about it once the leaves have fallen.

If you have questions about selecting, planting, or caring for a tree, contact your local Extension office or consult an ISA Certified Arborist for site-specific advice. You can find an ISA Certified Arborist through Find an Arborist.

Original article and Additional resources are available through the Purdue Landscape Report.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
The Purdue Landscape Report
Planning the Tree Planting Operation, The Education Store
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Tree Planting Part 2: Planting Your Tree, The Education Store
Planting Your Tree Part 1: Choosing Your Tree, Purdue Extension YouTube Channel
Summer Tree Care, Purdue Landscape Report
Tree Defect Identification, The Education Store
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Surface Root Syndrome, The Education Store
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
Ask an Expert: Tree Selection and Planting, Purdue Extension-Forestry & Natural Resources (FNR) YouTube playlist
ID That Tree, Purdue Extension-FNR YouTube playlist
Subscribe – Purdue Extension-FNR YouTube Channel

Ben McCallister, Urban Forestry Specialist
Purdue Forestry & Natural Resources

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Purdue Landscape Report: This article is not meant to raise an alarm for a new, deadly tree disease. Rather, I wish to increase your awareness of a disease that has been around for a long time. According to Purdue experts, it is one of the most common and destructive diseases of woody ornamental plants in the Midwest.

John Bonkowski, plant disease diagnostician, and Tom Cresswell, director of the Purdue Plant and Pest Diagnostic Laboratory (PPDL), authored the Purdue Extension publication entitled “Verticillium Wilt of Woody Plants.”

The authors describe common and highly susceptible woody hosts of this disease, including redbud, smoketree, tree-of-heaven, maples, rose, lilac, boxwood, and barberry. In addition to woody plants, Verticillium also infects potato, tomato, pepper, eggplant, raspberry, and peppermint. More than 300 plant species have been reported to be susceptible to the disease.

Verticillium wilt is caused by soil-borne fungi in the genus Verticillium. V. dahliae is the most common pathogen encountered in the Midwest, according to the experts. The fungus lives in the soil, and fungal hyphae (microscopic, thread-like filaments that make up the “vegetative” body of fungi) infect plants through the root system of susceptible hosts and invade their water-conducting tissues (xylem). The tree responds by plugging some of the water-conducting vessels with gums and other materials. This restricts water flow in the plant, leading to drought-like symptoms and dieback.

“During midsummer, leaves turn yellow at the margins, then brown and dry,” they said. “Sudden wilting of leaves on one or several branches may occur, which is known as flagging.” They said that frequently, the foliage on only one side of a tree wilts, while the other side remains healthy. The wood under the bark of wilting branches is discolored in streaks following the length of the stem. “The discoloration will vary from bright olive-green (maples) to chocolate-brown (redbud), depending upon the tree species and how long it has been infected.”

“To examine for discolored sapwood, cut into the outer sapwood at the base of branches showing leaf wilt; also examine the outer rings of wood at the cut end of a pruned branch for discoloration,” they said.

“Host susceptibility, site conditions, and environmental conditions influence severity of symptom development,” they said. “Trees under drought, nutrient, or salt stress are more symptomatic.” They said that the speed of decline due to Verticillium wilt will also depend on the tree species. An infected tree may die in a single season or linger on for many seasons, with branch after branch dying and later being invaded by other decay or canker fungi.

So, what can a homeowner do?

“There are no effective fungicide treatments for infected trees,” they said. “Trees or shrubs with mild symptoms can often be maintained for several years by pruning out dead limbs and providing optimal care (appropriate amounts of mulch and fertilizer, and irrigation during dry periods).” Ultimately, most susceptible woody plants decline and die within a few years following first appearance of symptoms.

They said that only Verticillium-resistant trees and shrubs should be planted in landscape sites known to have Verticillium in the soil.

Although Verticillium wilt could affect trees virtually anywhere in Indiana, it is not present in every landscape. In fact, Cresswell said, “We find Verticillium only a few times a year, and it is probably widely scattered all over the state.” So, don’t be too quick to give up on your trees and shrubs, nor immediately assume that a declining tree, such as a maple, has Verticillium wilt.

If you suspect that a plant in your landscape might be suffering from Verticillium wilt, you can send a representative sample and a completed submission form to the Purdue Plant and Pest Diagnostic Laboratory for analysis. Stems should have streaks in the wood to test for Verticillium. Find information at the Plant & Pest Diagnostic Lab.

Find a more complete listing of susceptible and resistant plants in the referenced publication, available at Purdue Extension’s Education Store.

Resources:
Intro to Trees of Indiana: Flowering Dogwood – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources (FNR)
Diseases in Hardwood Tree Plantings, The Education Store, Purdue Extension’s resource center
Tree Installation: Process and Practices, The Education Store
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
Forest Health Problems Impacting Indiana Forest Resources​, Indiana Department of Natural Resources
Find an Arborist video, Trees are Good-International Society of Arboriculture (ISA)
Tree Risk Management – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources (FNR)
Is It Possible to Replant Trees in an Oak Wilt Disease-Infected Area? – Got Nature? Blog, Purdue Extension – FNR
Why Is My Tree Dying? – Got Nature? Blog, Purdue Extension – FNR
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – FNR
Planting Your Tree Part 1: Choosing Your Tree, video, Purdue Extension – FNR YouTube Channel
ID That Tree, Purdue Extension – FNR YouTube playlist
Woodland Management Moment, Purdue Extension-FNR YouTube playlist
Subscribe – Purdue Extension-FNR YouTube Channel

John Woodmansee, Extension Educator, Whitely County
Purdue Extension

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Purdue Landscape Report: When considering trees, shrubs, and forbs or grasses to plant for landscaping, a little research in advance can lead to dual benefits for both the appearance of your planting area and a wildlife-friendly landscape. Our native wildlife species are tuned into using our native plant species, so selecting plants that are naturally found in your area is a first positive step for plantings that benefit native animals. This can happen at a lot of levels. Oaks are a good example of this multi-level benefit. We might naturally think of the acorns that oak trees produce as the major wildlife food benefit, and it is extremely important for a host of mammal and bird species including jays, turkey, squirrels and deer. It is less obvious, but no less important, that oaks support hundreds of insects that feed on their leaves and acorns, and those insects support many species of birds and other animals that feed on them. Indiana has over 17 species of oak trees native to the state, so there is an oak tree suited to almost any site or situation.

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In this edition of ID That Tree, Purdue Extension Forester Lenny Farlee introduces us to Nannyberry Viburnum, a native shrub found across Indiana woodlands. Learn how to identify Nannyberry by its finely serrated leaves, drooping branches, clustered fruit and seasonal changes from spring blooms to fall color. Lenny also shares where this species commonly grows and how it fits into Indiana’s natural landscapes. This video provides a helpful introduction to identifying Nannyberry Viburnum whether you’re a student, landowner, or just interested in better understanding the trees and shrubs around you.

 

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
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
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, Purdue Extension’s resource center

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

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In this edition of ID That Tree, Purdue Extension Forester Lenny Farlee introduces us to Eastern Swamp Privet, a native Indiana shrub commonly found in wetland and swampy habitats. Unlike the privets around yards, homes and towns, the Eastern Swamp Privet comes from a different genus of plants. Learn how to identify this species by its opposite arrangement, simple leaves, finely toothed margins and spurs. This video provides a helpful introduction to identifying Eastern Swamp Privet whether you’re a student, landowner, or just interested in better understanding the trees and shrubs around you.

 

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
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
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, Purdue Extension’s resource center

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

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Most of us have probably heard or seen a lot about pollinators in the media recently. The reason why is that pollinators are really, really important. We simply can’t live without them. Researchers estimate that one out of every three bites of food we eat is made possible by pollinators. More than 100 food crops in the U.S. depend on pollinators, including almost all fruit and grain crops.

There are many different types of pollinators including native bees, butterflies and moths, beetles, flies, wasps, and of course hummingbirds. But perhaps one of the more interesting pollinators is the Monarch. Millions of Monarchs congregate in a relative small area in Mexico each winter. In March they start their journey north which has occurred over several generations. Unfortunately, the number of Monarchs counted in overwintering colonies has declined over the past 25 years.

In response, many states including Indiana have developed a state Monarch Conservation Plan. With input from many stakeholders over several years, the Indiana Monarch Conservation Plan was released in December 2020. One goal of the plan was to create an online resource that would act as a clearinghouse for Indiana monarch and pollinator conservation data, research, best management practices (BMPs), and events. I invite you to visit the Indiana Monarch and Pollinator Conservation Hub at indianawildlife.org/monarchs.

You might be asking yourself, ‘Why is a wildlife specialist writing about pollinators?’ It turns out that quality habitat for wildlife is often quality habitat for pollinators. The diversity of wildflowers, along with the structure provided by native grasslands, trees, and shrubs, benefits all of them. Native grasslands that have a diverse mixture of wildflowers provide food, bare ground, and structure desirable for a wide variety of pollinators.

Resources
Protecting Pollinators: Why Should We Care About Pollinators?, The Education Store, Purdue Extension resource center
Ask The Expert: What’s Buzzing or Not Buzzing About Pollinators , Purdue Extension – Forestry & Natural Resources (FNR) YouTube Channel
Purdue Pollinator Protection publication series, Purdue Extension Entomology
Is My Urban Garden Helping Native Pollinators?, Purdue Landscape Report
Indiana Monarch & Pollinator Conservation Hub, Indiana Wildlife Federation
Monarch Watch, University of Kansas
100 Plants to Feed the Monarch/Other Resources Available, Xerxes Society for Invertebrate Conservation

Brian MacGowan, Wildlife Extension Specialist & Extension Coordinator
Purdue Department of Forestry and Natural Resources

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In this edition of ID That Tree, Purdue Extension Forester Lenny Farlee introduces us to Shumard oak, a native oak species found in parts of Indiana. While it is sometimes confused with other oaks, including northern red oak, this species has key characteristics that set it apart. Learn where Shumard oak is typically found, how it fits into Indiana’s woodland landscapes and what to look for when distinguishing it from similar plants. This video provides a helpful introduction to identifying Shumard oak whether you’re a student, landowner or just interested in better understanding the trees around you.

 

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
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
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

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In this edition of ID That Tree, Purdue Extension Forester Lenny Farlee introduces us to a native Indiana shrub that’s seen less often than some of its relatives. While it’s related to other sumac species, fragrant sumac has its own place in Indiana’s landscapes. Learn where it grows, how it fits into woodland and edge environment along with what makes it distinct from other sumacs you might recognize. Whether you’re a student, landowner or even just simply curious about native shrubs, this video offers a quick overview of this interesting bush in Indiana.

 

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
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
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

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As the snow flies and the temperature drops, there are still some activities that we can do to remind us that spring is on the way. One of those is planning for tree planting. The Indiana DNR Division of Forestry operates a nursery system that provides tree and shrub seedlings to Indiana landowners. The seedlings are intended for conservation plantings for purposes like wildlife habitat, erosion control, windbreaks, and reforestation plantings. The state nursery also provides Select black walnut, red oak, white oak and black cherry seedlings for those interested in growing trees for timber. These seedlings are a result of tree breeding programs at the Division of Forestry and Purdue University. Seedlings are mostly bare-root one and two year old stock intended for spring planting. Seedlings are still available for purchase from the state nursery system. You can find ordering and contact information for the state nursery at Instructions for Ordering Tree Seedlings.

There are also several private nursery options for ordering tree seedlings in Indiana. The private nurseries may be able to offer species, sizes, and quantities of seedlings not available from the state, and can also sell trees for non-conservation purposes like landscaping and Christmas trees. The National Nursery and Seed Directory provided by the USDA Forest Service provides a directory of seed and plant sources across the region.

When planting trees and shrubs, be sure to check the suitability of your site for the species of plants you plan to use. Long-lived woody plants need to be on sites well-suited to their growth for good long-term results. You can consult the Web Soil Survey for maps and information covering the soil types on your property. You can also consult forestry and conservation professionals for advise and assistance. Purdue Extension offers several resources for planning your tree planting including publications and upcoming workshops. Check out upcoming events: Purdue Extension – Forestry and Natural Resources (FNR) Events.

So, take some time while the snow is falling to make plans for a warm spring day of tree planting.

Resources:
Instructions for Ordering Tree Seedlings, Indiana DNR Division of Forestry
National Nursery and Seed Directory, USDA Forest Service
Conservation Tree Planting: Steps to Success – webinar, Purdue Extension-Forestry & Natural Resources (FNR) YouTube Channel
Web Soil Survey, USDA Natural Resources Conservation Service
Deer Impact, Purdue Extension Pond & Wildlife
Planting Forest Trees and Shrubs in Indiana (pdf), located on The Education Store, Purdue Extension’s resource center
Planting and Care of Fine Hardwood Seedlings (pdf), located on The Education Store, Purdue Extension’s resource center
Importance of Hardwood Tree Planting , The Education Store
Designing Hardwood Tree Plantings for Wildlife, The Education Store
Resources and Assistance Available for Planting Hardwood Seedlings, The Education Store
Creating a Wildlife Habitat Management Plan for Landowners, The Education Store
Forest Improvement Handbook, The Education Store
How to Build a Plastic Mesh Deer Exclusion Fence, The Education Store
ID That Tree, Purdue Extension-Forestry & Natural Resources (FNR) YouTube playlist
Woodland Stewardship for Landowners, Purdue Extension – FNR Extension YouTube Playlist
Woodland Management Moment, Purdue Extension – FNR YouTube Playlist
Subscribe – Purdue Extension-FNR YouTube Channel

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

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Once the leaves have fallen and the landscape is dominated by shades of brown and gray, bright colors like red catch our attention. There are several red fruits that we may encounter in the late fall and winter here in Indiana that add some color to the landscape. These fruits are retained on trees and shrubs for a variety of reasons. Some are not as palatable to wildlife, so they are eaten later in the season. Some are more resistant to freeze damage and thus cling to branches longer than delicate fruits. There may also be an advantage to their appearance. Many of these plants have seeds dispersed by wildlife like birds, which eat the seeds and excrete them later, providing an opportunity to produce new plants away from the parent. Many birds can see much of the same color spectrum we do, plus enhanced vision in the ultra-violet bands. Brightly-colored seeds with waxy skins may reflect more ultra-violet light and be more noticeable to the birds.

What are some of those red fruits?
One family of plants accounts for several red fruit we can see in late fall and winter, the rose family. This family includes apples, plums, cherries, hawthorns, pears and others as well as the roses. In Indiana we have several hawthorns (Crataegus species) that produce a fruit resembling a tiny apple. These vary in size by species but are typically ¼ to ½ inch diameter and often held in clusters. Hawthorns are typically small trees and may have long thin thorns on the twigs.

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