Purdue Landscape Report: Many homeowners have evergreens in their home landscape. Evergreens provide a landscape service that other plants cannot – they add color to our landscapes in the winter, and provide some thermal protection for animals and birds. However, if you are researching potential evergreens for your landscape, you may be confused about species names and the botanical differences between them.
Identifying evergreens is a difficult task for most people, which is why many interchange the terms “evergreen” and “pine tree,” but we can also think of spruces, firs, hemlocks, and other species. Although I encourage planting native trees, I’ll cover several native and non-native evergreen species that may be planted or encountered in Indiana.
Let’s start with the basic aspects of pine trees. Pines have needles that are wrapped together in bundles (called fascicles) of 2, 3, or 5 needles, and their cones hang down from branches. Common 2-needled pines include (from shorter to longer needles) Jack pine, Virginia pine, Scots (or Scotch) pine, Austrian pine, and Red pine. 3-needled pines are somewhat rare in Indiana. Loblolly pine is one, and has very long needles, 6-9 inches long. We have one common 5-needled pine tree, the Eastern white pine.
Figure 1. Pine needles are found in bundles (fascicles) in two, three, or five needles.
Figure 2. Spruce needles are attached singularly to the stem.
Spruces have square needles borne singly on short pegs on the stem, and their cones hang down from branches. There are no native spruces in Indiana. From shorter to longer needles, you might encounter Black spruce, White spruce, Norway spruce, and Colorado blue spruce. Norway spruce is noticeable from a distance because its branchlets droop pendulously from the main branches. Firs have soft, flexible, flattened needles borne singly on the stem. Cones grow upward on branches, rather than hanging down. You may encounter Balsam fir or White (Concolor) fir. Douglas-fir is not a true fir tree; it has hanging cones with 3-pointed bracts on the cone scales.
An evergreen with flat needles is Eastern hemlock. Unlike most other evergreens, it can tolerate some shade. Needles appear green on top and whitish underneath.
Evergreens with awl-like (short and pointy) or scale-like (imagine fish scales) needles include Eastern redcedar and Northern white-cedar (Arborvitae). Eastern redcedar is by far the most widely distributed native conifer in Indiana, with small, pale-blue, round cones. Northern white-cedar is used successfully in many Indiana landscapes. Columnar varieties are commonly used as a living fence.
Before we leave our discussion today, we should cover some additional terms and species.
Evergreens maintain their foliage all year, while deciduous trees lose their leaves each fall. Most evergreens are conifers (cone-bearing plants).
However, we have a few conifers that are deciduous trees, such as Baldcypress, Dawn redwood, and American/Eastern larch (also called Tamarack). Baldcypress and Dawn redwood have soft, flat needles, while Tamarack has many needles in a cluster on older growth, or just single needles on newer growth.
It should not come as a shock that native trees tend to thrive in their native environment. However, you may be surprised to learn that the list of native conifers in Indiana is relatively short. It includes Eastern redcedar, Jack pine, Eastern white pine, Virginia pine, Northern white-cedar, Eastern hemlock, Tamarack, and Baldcypress (1). Except for Eastern redcedar, most of the trees on this list are native only to limited areas of Indiana. Some non-native species are flexible in their site requirements and climate constraints, while other species may struggle to achieve longevity in our landscapes.
Finally, I realize that for many people, descriptions of trees are a poor substitute for good pictures or videos. There are many good field guides and tree identification books available. Digital sources include the Purdue Plant Doctor, https://purdueplantdoctor.com/, and Purdue “ID That Tree” videos created by Purdue Extension Forester, Lenny Farlee (find through a search on YouTube).
(1) From native range maps in Native Trees of the Midwest, by Sally S. Weeks, Harmon P. Weeks, Jr., and George R. Parker.
Purdue Landscape Report: Pollarding is a tree pruning method in which the upper branches of a tree are cut back to the same points on a regular schedule, creating a framework of knobby growth points from which new shoots emerge. The practice has been used for centuries and is especially common in landscapes where trees must be kept at a controlled height or width. Pollarding is not the same as topping, which is generally considered harmful because it removes branches without a long-term management plan. Instead, pollarding is a deliberate, repeated technique that can shape a tree into a compact, manageable form.
One of the main advantages of pollarding is size control. In urban areas, along streets, and near buildings or utility lines, trees often need to fit within tight spaces. Pollarding can reduce conflicts with overhead wires, streetlights, sidewalks, and traffic while still allowing a tree to remain in place. It can also reduce shade, which may be useful in courtyards, parking areas, and other sites where too much canopy cover is a problem. Some trees also respond by producing dense, attractive new growth, which can give them a distinctive architectural look.
Pollarding may also extend the usable life of certain trees when it is started early and maintained properly. Because the tree is kept smaller and more compact, it may be less likely to fail under wind or storm stress than a large tree with heavy limbs. In some settings, the regular cutting of new shoots can even provide a source of small-diameter wood or fodder, which helps explain why pollarding developed historically as a practical land-management method.
That said, pollarding has real drawbacks. It must be done correctly and consistently; if a tree is pollarded at the wrong age, on the wrong species, or after long neglect, the result can be stress, decay, weak regrowth, or structural problems. Not all trees tolerate the practice well, and some may decline if pollarded too aggressively. Pollarding also creates a very artificial appearance, which some people dislike. A freshly pollarded tree can look bare or severe for a time, and the repeated cuts require ongoing maintenance.
Figure 1: New growth on pollarded tree. Photo credit: Ben McCallister
Figure 2: Pollarded street trees in Shibuya, Tokyo. Photo credit: Ben McCallister
Pollarding is most strongly associated with Europe, especially Britain, France, the Netherlands, Italy, and parts of Spain, where it has a long history in both rural and urban landscapes. Today, it is still widely seen in European cities and towns, particularly on street trees and in managed public spaces. It also appears in some parts of North America, but it remains much more culturally visible and historically rooted in Europe. In many places, it is valued both for its practical function and for the distinctive form it creates over time.
Used thoughtfully, pollarding is a useful tool rather than a universal solution. It works best when matched to the right species, the right site, and a long-term maintenance plan. For the right tree in the right place, it can be both functional and visually striking.
Danielle Howard stands in front of a field on fire from a prescribed burn.
Danielle Howard has been hired as an Extension prescribed fire specialist housed with the Department of Forestry and Natural Resources at Purdue.
The prescribed fire specialist position, funded by the Sam Shine Foundation, aims to increase prescribed fire capacity in Indiana by coordinating, conducting, and leading prescribed fires and prescribed fire training and outreach statewide.
In this role, Howard also will support the formation of prescribed burn associations (PBAs) and the Indiana Prescribed Fire Council (INPFC). She will work closely with Indiana conservation partners to develop prescribed fire training and outreach that builds capacity and support for prescribed fire on public and private land in Indiana.
“Prescribed fire is key to maintaining healthy ecosystems in Indiana, and I’m very excited to be at the forefront of increasing its use across the state,” Howard said.
Co-PIs on the supporting grant titled “Building Capacity for Prescribed Fire in Indiana” are Extension wildlife specialists Jarred Brooke and Brian MacGowan, Extension forester Lenny Farlee, natural resources training specialist Jessica Outcalt and Dr. Zhao Ma.
Danielle Howard holds a drip torch while starting a prescribed burn.
Howard, who previously worked in FNR as the field coordinator for the Hardwood Ecosystem Experiment from 2020 to 2023, comes to her new role after spending the last three years as the central region ecologist for the Indiana Department of Natural Resources Division of Fish, Wildlife and Nature Preserves. In that role, she managed 71 state-dedicated nature preserves and multiple privately-owned conservation easements across 26 counties in central Indiana. She also planned, prepared and implemented prescribed fire, invasive species control measures, native plantings, forest stand management and other restoration activities. She also established and sampled research plots for post-fire vegetation monitoring in Brown County State Park.
Howard also has taught Applied Ecology as an adjunct professor at Indiana University since January 2025.
In her previous stint in FNR as part of the HEE project, Howard coordinated forest management research activities, including bird surveys, overstory plots, small mammal trapping and more, conducted by various universities and partners at sites in Morgan-Monroe and Yellowwood State Forests.
Previously, she acted as an intermittent bird biologist for the Indiana DNR, the whooping crane outreach program assistant in Indiana for the International Crane Foundation and as a farm bill wildlife biologist for Pheasants Forever/Quail Forever.
Howard is a type II certified wildland firefighter and has certifications in prescribed fire for managers, wildlife fire chainsaws (S-212), wildlife fire pumps (S-211) and a pesticide applicator’s license for core and forests.
Howard began her new role on May 18. She will be based remotely in Bloomington, Indiana.
Purdue Forestry & Natural Resources (FNR) Extension would like to share a timely update from the Indiana Department of Natural Resources – Division of Entomology newsletter regarding a wood-boring insect that may be encountered in hardwood logs across the state. Will Drews, Entomology staff member located in south-central Indiana (Bloomington area), recently reported activity from one of the more common round-headed borer pests found in hardwood logs: the flat-faced longhorn beetle, Graphisurus fasciatus. Will shares in the Entomology Weekly Review how to identify the borer, their habitat and if we need to be conerned.
What to Look For On the wing recently is one of the more common round-headed borer pests I find in hardwood logs, and that is the flat-faced longhorn beetle without a common name: Graphisurus fasciatus (Photos 2 – 5). This longhorn beetle (in the family Cerambycidae) is quite large as far as longhorn beetles go, reaching up to 0.6 inches in length, and features two long antennae (aka “horns”) characteristic of most of its family (Photo 3).
Photo 2 – Flat-faced longhorn beetle (Graphisurus fasciatus) adult found on a black walnut (Juglans nigra) log during a recent phytosanitary inspection.
Photo 3 – Flat-faced longhorn beetle (Graphisurus fasciatus) adult female lateral view at 10X magnification. Note the long “horns” or antennae which are a little longer than the main body.
Photo 5 – Flat-faced longhorn beetle (Graphisurus fasciatus) adult female lateral view at 20x magnification. G. Fasciatus is parte of the flat-faced longhorn beetle subfamily (Lamiinae), which its membes are characterized by a long, usually flat face, shown here.
Host Trees and Habitat
As a larva, Graphisurus fasciatus feeds on a variety of hardwoods and is reported to feed on pine trees as well. I generally find G. fasciatus larvae feeding between
the bark and sapwood of black walnut (Juglans nigra), white oak (Quercus alba ) and red oak (Quercus rubra) logs (Photo 6).
Photo 6 – Flat-faced longhorn beetle (Graphisurus fasciatus) larva (below) and pupa (above) with signs of larval mines on a red oak (Queracus rubra) log.
Identification Tips There are several ways to differentiate this species from the less common but closely related Graphisurus despectus, but one of the surest ways is to examine the scutellum (aka the small shield-like plate at the top/between the elytra [wing covers]). In G. fasciatus, the scutellum has two small whitish patches of hair, not present on G. despectus (Photo 7). Another diagnostic characteristic of G. fasciatus is that it has elytra with emarginate (or notched) tips (Photo 8).
Photo 7 – Flat-faced longhorn beetle (Graphisurus fasciatus) adult female dorsal view at 20X magnification showing scutellum (cirecled in red). Note the two light/whitish patches of hair on the scutellum. This is one of the best ways to distinguish G. fasciatus from G. despectus.
Photo 8 – Flat-faced longhorn beetle (Graphisurus fasciatus) adult female dorsal view at 20X magnification showing its elongated ovipositor. the ovipositor of G. fasciatus is quite unusual and proturberant for a longhorn beetle species and makes the females closer to 0/75 inches in length counting it. Also present in this image is the emarginate (or notched) tips of the elytra. This is another distinguishing characteristic of G. fasciaturs.
Should You Be Concerned?
This species can be alarming by its noticeable size and relative abundance but is not necessarily a major pest of concern as it does not usually bore into the sapwood and cause defects to the wood.
Stay Informed
FNR Extension encourages landowners and natural resource professionals to remain observant when working with hardwood logs and report unusual insect activity when found.
Agricultural & Natural Resources (ANR) Newsletter: On May 5, Natural Resources professionals gathered at the Davis Purdue Agricultural Center (DPAC) in Farmland, Indiana, for a forestry and wildlife management training led by Purdue Forestry and Natural Resources’ Brian MacGowan, wildlife extension specialist and extension coordinator; Don Carlson, forester; Jarred Brooke, wildlife extension specialist; and Jessica Outcalt, natural resources training specialist. The program combined classroom updates with field-based learning focused on active land stewardship, habitat management and conservation planning.
Jarred Brooke provided an overview of prairie grass plantings, including seed mixes, establishment methods and species composition.
Don Carlson discussing the 2014 planting and the management goals involved at Herrmann Property.
During the field tour of DPAC and Herrmann Properties, participants explored topics including native warm-season grass management using prescribed fire, Sericea lespedeza control in native grass plantings, prairie restoration, young forest management, and oak forest management for multiple objectives. Don Carlson discussed the history and management goals of DPAC, emphasizing how tree spacing, mowing and the use of crop and nurse trees influence tree establishment and growth. Jarred Brooke highlighted challenges such as rabbit damage to young trees and invasive species management. Participants learned key wildlife habitat principles, including a practical guideline for quail habitat: If a baseball tossed into the grass rolls, the habitat structure is suitable for quail; if it does not roll, the vegetation is too dense. The day concluded with updates on the NR Training Hub, prescribed fire and evaluation efforts.
If you’re interested in bringing a program like this to your area, we’d love to hear from you, submit a request at fnrextension@purdue.edu.
Emily Kring, Extension Educator
Agriculture & Natural Resources, Purdue Extension Jay County
With storm season just around the corner, one topic of concern on many minds is damage to and from trees. Depending on the intensity of the storms and the condition of the trees, damage from high winds, heavy rainfall, and lightning can be quite severe. Cracked or broken branches, stem failure, and root failure are some of the main concerns, but also the risk and liability of damage to people and property.
If your tree is damaged, there are some steps to deal with the situation. First and foremost, consider the safety of yourself and others around you. Inspect the tree from a distance first looking for the following:
Heaving of the ground indicating potential root failure
Damage to limbs and/or the trunk of the tree
Hanging branches can fall to the ground resulting in injury or death
Be aware of utility and power lines. Trees can become charged by coming in contact with live wires. All utility lines should be considered energized and dangerous.
If you find your trees damaged from a storm hiring an International Society of Arboriculture (ISA) Certified Arborist to perform a risk assessment will help guide your decision of how to manage your tree. To find an arborist near you and verify credentials use the link at Find an Arborist, Trees are Good, International Society of Arboriculture (ISA). For more information, you can also view Trees and Storms: Understanding Damage, Risk and Recovery, an informational Got Nature? Blog article from Purdue Extension.
Purdue Landscape Report: Many of the leaf spot diseases we observe can cause premature leaf drop in affected plants, which can reduce plant vigor if the disease is severe enough and a large proportion of the canopy falls in one season. Elm trees are susceptible to a number of different anthracnose fungi, including Ophiognomoniaintermedia, Gloeosporium betulae, Cryptocline betularum, and Cylindrosporium sp. Cryptocline is the fungus that we encounter the most frequently on samples submitted to the lab for diagnosis.
Figure 1: Cryptocline leaf spot on Elm (photo by Paul Bachi, University of Kentucky Research and Education Center)
Figure 2: Cryptocline leaf spot on a young elm shrub. As the density of leaf spots increases, the leaf blade turns more yellow. (Photo from Purdue Landscape Report)
Figure 3: Mature Cryptocline lesions which are tan in color and have black fungal structures within (photo from Purdue Plant & Pest Diagnostic Laboratory)
Symptoms
Leaf spots may start as small, round chlorotic lesions that slowly expand over time (Figures 1 & 2). Eventually, a necrotic spot with a purple/black border and tan or white center will form (Figure 3). Lesions may begin to develop on a leaf vein and instead of being circular will follow the vein a little, creating a thin necrotic lesion (Figure 4). With increased leaf spot development, large areas of the leaf blade will turn yellow and eventually necrotic, before it falls from the tree (Figure 5). Leaf drop will typically occur in the lower canopy, areas where there is less air movement and higher humidity; however, epidemics occur during periods of we weather that can cause significant leaf drop. Leaf loss typically occurs in the summer (late July to mid-August).
Figure 4: Lesions of Cryptocline located on leaf veins, creating elongate necrotic lesions instead of the typical round lesions located elsewhere on the leaf. (Photo from Purdue Plant & Pest Diagnostic Laboratory)
Figure 5: Elm leaves which have turned yellow or necrotic and fallen prematurely from the tree. (Photo from Plant & Pest Diagnostic Laboratory)
Figure 6: Close up image of Cryptocline leaf spots with acervuli. (Photo by Paul Bachi, University of Kentucky Research and Education Center)
Life Cycle Cryptocline is only known to colonize the leaves, so it overwinters in fallen leaf tissue. In the spring, the fungus will produce ascospores which are carried in the wind to infect young elm leaves. Once initial lesions progress, black fungal structures (acervuli) will form in the necrotic tissue and being producing asexual spores (conidia) in a sticky substance, which can be spread via rain (Figure 6). The conidia act as a secondary infection cycle where it will infect foliage and create new leaf spots continuously throughout the growing season as long as the environmental conditions are conducive.
Management
Like other leaf spot pathogens that do not infect stems, removal of the foliage in the fall can reduce inoculum for the following year (though won’t eliminate the disease). Providing fertilizer (where needed) and water (hot and dry periods) will help mitigate some tree stress, as stress can predispose plants to increased disease severity. Fungicides are not normally recommended for mature trees as it is impractical to get coverage across the entire canopy, but could be practical in a nursery setting if symptoms are observed and leading to leaf drop. It is still early in the season, but the next few weeks are important to monitor for some disease issues that may explode later in the season.
For other information on management of foliar disease problems, please see the following link: Foliar Fungal Disease Management.
Join Purdue Extension forester Lenny Farlee in this episode of “A Woodland Management Moment” as he explores the considerations for growing high timber-quality black walnut on purpose. Learn about what black walnut requires to grow well, its visual characteristics and the timeline of this plant in openings. Watch the video to discover some of the management strategies you can use gradually develop these black walnut stems for timber markets.
If you have any questions regarding trees, forests, wildlife, wood products, or other natural resource topics, feel free to contact us by using our Ask an Expert web page.
Spring is one of the best times to identify trees and shrubs in Indiana. As buds break and flowers emerge, many species reveal distinctive traits that make identification easier and more enjoyable. In this collection of ID That Tree videos, Purdue Extension Forester Lenny Farlee highlights a variety of native trees and shrubs from eye-catching flowering species to lesser-known woodland plants. Whether you’re a student, landowner or simply enjoy exploring the outdoors, these videos offer a quick and accessible way to build your tree identification skills this spring.
Explore the Spring Bloom Edition videos, starting with Umbrella Magnolia:
Continue building your identification skills with these additional ID That Tree: Spring Bloom Edition videos:
If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, Purdue Extension – FNR is here to help. Visit our Ask an Expert webpage to connect with a Purdue Extension specialist.
