Purdue University - Extension - Forestry and Natural Resources
Got Nature? Blog
Buying locally, particularly food products from local growers, has become a popular way to support local community business and live an environmentally responsible lifestyle. In Indiana, there is another product that is renewable, recyclable, sustainable and grown locally in abundant supply and high quality – hardwood timber. Indiana is approximately 20-21 percent forestland and is home to over 100 species of native trees, most of which are deciduous hardwoods.
Our hardwood forests and tree plantings provide habitat for wildlife; protection for soil and water resources; recreational opportunities for hikers, campers, birdwatchers and hunters; and beautiful landscape scenes every season of the year. They also provide us with a renewable and sustainable supply of fine hardwood forest products, many of which are harvested, processed and turned into consumer products by companies here in Indiana.
The forests of Indiana are owned primarily by its private citizens; about 84% of the forest is held by individuals as part of a farm or personal woodland. Many of these owners use income from selling trees to maintain their woodlands, pay property taxes and support their families. Wages paid by loggers, lumber mills and wood product companies like flooring, furniture and cabinet manufacturers support thousands of families and add billions of dollars to the Indiana economy. The wood products manufacturing industry is the leading employer in the agriculture sector in Indiana.
Diversity seems to be the theme for Indiana wood products. We have many tree species that enter the marketplace in one form or another, including oak, ash, maple, walnut, cherry, tulip tree, hickory and even sassafras and sycamore. The products produced run the range of our interests and lifespans, from cradles to caskets and all the floors, furniture, cabinets and doors we use in between.
If you are concerned about responsible use of our natural resources, you can feel pretty good about Indiana wood as well. Extensive forest inventories administered by the U.S. Forest Service and Indiana DNR indicate annual growth of wood volume exceeds harvest and natural mortality by over three times. DNR Division of Forestry state forestlands, the privately held Classified Forest and Wildlands properties and privately held Tree Farm properties are certified as meeting sustainable forest management criteria as determined by internationally recognized forest sustainability certifying organizations.
Many landowners recognize the value of using a professional forester to help them meet their property management goals in a renewable, responsible, sustainable way. They are also helping us all enjoy the opportunity to own another great locally grown product – Indiana hardwoods.
If you are looking for a forester to assist you with management on your property, visit Indiana Forestry and Woodland Owners Association (IFWOA) – Directory of Professional Foresters.
To find out more about the forest products of Indiana, visit Indiana Forest Products Community.
To learn more about the extent and sustainability of Indiana forests, visit A Landowner’s Guide to Sustainable Forestry.
Resources:
Purdue Forestry and Natural Resources Publication List
The Education Store, Purdue Extension (place in search field: “timber”)
Find an Indiana Professional Forester, Indiana Forestry & Woodland Owners Association (IFWOA)
Purdue Arboretum Explorer
Native Trees of the Midwest, Purdue University Press
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
ID That Tree, Purdue Extension-Forestry & Natural Resources (FNR) YouTube playlist
Woodland Management Moment , Purdue Extension-FNR YouTube playlist
Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Forestry and Natural Resources, Purdue University
As teachers prepare their lessons for the fall, The Nature of Teaching is a great website to visit for science-based resources. Teachers can find free lesson plans, printable, posters, a photo library, information on upcoming workshops and more. You will find on the website tabs titled “Formal Curriculum” and “Informal Curriculum.” The Nature of Teaching also offers professional development workshops for teachers focused on science, the environment, and getting students connected with nature.
These organized lesson plans meet several K-5 Science and Math Academic Standards along with three 9-12 Natural Resource Management Academic Standards.
Wildlife curriculum include:
- Animal Diversity and Tracking
- Discovering the Watershed: Effects on Water Quality
- Common Indiana Mammals: Natural History and Identification
- Invasive Plants: Impact on Environment and People
- Hellbenders Rock! Natural History and Conservation of the Eastern Hellbender
Food Waste curriculum include:
- Food Waste and Natural Resources
- What a Waste of Food!
- Food Waste and The Environment
- Food Waste Solutions
- Transporting Food Waste
Health & Wellness curriculum include:
- Unit 1 Benefits of Connecting with Nature
- Unit 2 Gardening Station
- Unit 3 Tree Talk Station
Other resources:
- Help the Hellbender, Purdue Extension
- Indiana Department of Natural Resources (INDNR): For Kids
- 4-H, Purdue Extension
- National FFA Organization
- Indiana FFA
- Flying Wild, Association of Fish & Wildlife Agencies
- Project Learning Tree, Indiana Department of Natural Resources
- Project Wet
- Project Wild
- Indiana Wildlife Habitat Evaluation Program (WHEP)
Contact The Nature of Teaching team if you have any questions regarding workshops, certifications and curriculum.
The Nature of Teaching, Purdue Extension
Indiana Conservation Officers and the DNR Division of Forestry are providing useful tips to landowners that can assist in protecting their valuable timber resources. To protect forestry resources, landowners should follow these steps:
- Hire a consultant forester to represent you and to mark and advertise your timber sale.
- Always get several bids from different timber buyers.
- Ask questions and get references from the timber buyer.
- Mark the trees to be cut with a paint mark on the stem and at ground level.
- Know and understand the fine details of the contract.
- Never make an oral agreement.
- Know how much you will be paid and the method of payment.
- Be a good neighbor and work out any property line disputes prior to harvesting.
The DNR offers a free information packet titled “callb4ucut” to those who may be considering harvesting their timber. See www.callb4ucut.com for further information.
For workshops on timber harvesting, check out the FNR Calendar and IN DNR Calendar.
For a list of consulting foresters, see The Indiana Forestry and Woodland Owners Association‘s (IFWOA) Directory of Professional Foresters.
Resources:
The Education Store, Purdue Extension (place in search field: “timber”)
Find an Indiana Professional Forester, Indiana Forestry & Woodland Owners Association (IFWOA)
Purdue Arboretum Explorer
Native Trees of the Midwest, Purdue University Press
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
ID That Tree, Purdue Extension-Forestry & Natural Resources (FNR) YouTube playlist
Woodland Management Moment , Purdue Extension-FNR YouTube playlist
As the snow finally melts, we are approaching the prime time for planting bare-root trees and shrubs in Indiana. Planting bare-root seedlings is a proven, cost-efficient method to establish trees and shrubs on your property for a variety of purposes, as long as some basic steps are followed.
Prior to planting, prepare your site by eliminating competing vegetation where the seedlings will be planted. This can be done with tillage or herbicides. Areas with heavy sod or perennial weed growth are very difficult sites for small seedlings to survive and thrive. Clear all the competing vegetation in the planting area or create circles or bands two to three feet wide where the seedlings can grow. Be sure your site is suited to the species you want to plant. Soil survey and tree planting information from the USDA Natural Resources Conservation Service is available for every county in the state, either at NRCS offices or on the Web Soil Survey website: http://websoilsurvey.sc.egov.usda.gov.
When you receive your seedlings, keep them cool and moist until you can plant them. Plant them as soon as possible since the best place to store a seedling is in the soil! If you can’t plant them within a few days of their arrival, you can dig a trench and “heel in” the seedlings by planting them very close together and covering the roots with soil and/or moist mulch. This is still a short-term storage solution. You want to have your trees planted in their final locations before buds start to open.
When planting, keep seedlings stored in the shade, and roots should be kept moist until placed in the ground. A five gallon bucket with wet peat or sphagnum moss will work just fine for transporting seedlings to their planting locations. You can use several tools for planting, including shovels and commercial tree planting bars. The critical factors are planting the seedling at the correct depth and getting the root system in the ground such that it has good contact with the soil and is ready to grow. Seedlings should be planted with the root collar at or slightly below ground line. The root collar is where the stem changes to the root and is recognized by a color and texture change on the seedling stem. Be sure the soil is firmed around the seedling to close any air pockets that can dry out roots. Get your planting done as early in the spring as you can to take advantage of spring rains and a longer growing season for the seedling.
There are many more considerations for planning and implementing a successful tree planting that you can review in extension publications. See resources below for publications and videos.
To view the large photo used in this posting, visit How To Plant Seedlings.
Resources:
Planting Forest Trees and Shrubs in Indiana, The Education Store, Purdue Extension’s resource center
Native Trees of the Midwest, Purdue University Press
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, 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
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR Got Nature? Blog
Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Forestry and Natural Resources, Purdue University
Several myths have surfaced and resurfaced over many years. Indiana’s state forests have been managed by the Division of Forestry since the first state forest was established in 1903. Questions arise including acreage, management, level of harvest, the forestry profession and a number of other issues. The maintenance of ecosystem processes is inherently more important than a given stage of development that must be preserved.
Check out the Forest Management and Wildlife Habitat Myths and Truths of Indiana State Forests (pdf).
Resources:
Frost Seeding to Establish Wildlife Food Plots and Native Grass and Forb Plantings – Purdue Extension YouTube
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
Forest Improvement Handbook, The Education Store
Ordering Seedlings from the State Forest Nursery System, Got Nature? – Purdue Extension-Forestry & Natural Resources (FNR)
Designing Hardwood Tree Plantings for Wildlife – The Education Store
ID That Tree – YouTube Playlist
Forest Management for Reptiles and Amphibians: A Technical Guide for the Midwest, The Education Store
Ask the Expert: Hardwood Ecosystem Experiment – Birds and Salamander Research, Purdue Extension – FNR
A Template for Your Wildlife Habitat Management Plan, The Education Store
Managing Your Woods for White-Tailed Deer, 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
Subscribe Purdue Extension – Forestry and Natural Resources YouTube Channel, Playlists include wildlife, Nature of Teaching, Moments in the Wild and much more.
Indiana Department of Natural Resources
Division of Fish and Wildlife
Landowners in Indiana are fortunate to have access to inexpensive, high quality tree and shrub seedlings from the Indiana DNR Division of Forestry nurseries. These seedlings are one- and two-year-old bare-root plants intended for conservation plantings: windbreaks, wildlife habitat, reforestation, erosion control and other conservation uses. The seedlings are not to be planted for landscaping or Christmas trees or resold as rooted stock. Seedlings are available in multiples of 100 or in packets containing a mixture of species for different planting purposes like native nuts, timber or wildlife. You can access instructions for ordering and the order form with available tree species at Tree Seedlings Ordering Instructions, Indiana Department of Natural resources.
Demand for these seedlings is often high, so the nursery fills orders using a lottery drawing system. Orders submitted to the nursery by the third Friday in October are randomly drawn and filled until the nursery runs out of stock or all orders are filled. Orders received after this date are filled first-come, first served with any remaining seedlings. The order form provides spaces for second, third and fourth choices when ordering seedlings, and I recommend you use those to increase your chances of receiving all the seedlings you need. As an example, you might want to plant white oak, but you could list chinkapin oak, bur oak and swamp chestnut oak as alternates in case the white oak sells out. If you have questions about species characteristics, the nurseries provide information at a link on the previously mentioned webpage. Purdue also offers seedling planting advice in the following publication: Planting Forest Trees and Shrubs in Indiana.
Once your order is processed, you will be billed for the seedlings. Once paid, your seedlings are reserved for spring pickup at the nursery, or you can have the seedlings shipped to you for an additional charge. Some counties offer a local pickup service, so you may want to check with your county Extension Office or Soil and Water Conservation District to see if that is available in your area.
So if you would like to buy seedlings from the state forest nurseries, be sure to submit your order before October 19 and include alternative choices on your order form for the best chance of receiving what you need to complete your planting plans.
Resources
Purdue Forestry and Natural Resources Publication List
The Education Store, Purdue Extension (place in search field: “timber”)
Find an Indiana Professional Forester, Indiana Forestry & Woodland Owners Association (IFWOA)
Purdue Arboretum Explorer
Native Trees of the Midwest, The Education Store
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
ID That Tree, Purdue Extension-Forestry & Natural Resources (FNR) YouTube playlist
Woodland Management Moment , Purdue Extension-FNR YouTube playlist
Black locust
Credit: Richard Webb, Bugwood.org
I recently received an email from a private landowner:
I had a question for you about Black Locust and the Indiana’s Most Unwanted website. I saw Black Locust is listed on there even though another site says it’s native range includes Indiana. I see invasives.org mentions that it can become invasive in prairie and savanna areas. Can you shed a little light on this? I mean, I see it all over but not to the point of other invasives. Is it invasive in woodlands or just open areas? What is the deal?
Also on the Most Unwanted site, I see a lot of the plants say something like “Note – do not buy, sell or plant Asian bush honeysuckles,” but Black Locust does not. Any idea why? This site doesn’t really give a good feel for their classification as invasive, aggressive, noxious, etc. I didn’t know if there was a better site that could give me an idea for that or not as well.
I guess mainly I’m confused since it’s a native, it wouldn’t seem to me that it should be an invasive.
Thank you for your assistance.
This landowner has some really good questions regarding a tree species that is found across the state of Indiana. Now I have been talking on and off with this landowner about various species over the past year or so as he is fighting the good fight and trying to eliminate invasive and non-native species from his property but is also attempting to re-vegetate with native species. This is not the first time that I have had this discussion, so I thought why not answer his question so that others could also get to the information?
The websites this landowner provided are all great sites with tons of information for a bunch of different species. So inevitably when you get lots of great information about one species, it is easy to skip or unintentionally omit some details for other species. I hope the folks behind sites like these continue to build these great sources of information, update them with current best management practices and add new species as they become problematic.
Now, onto the questions.
Black locust, Robinia pseudoacacia, is native to the state of Indiana (Deam 1940, Flora of Indiana). However, when we talk about species that are native to the state, they may not be native to the whole state. With the settlement of the Midwest, it is thought that European settlers brought black locust with them as they traveled due to its fast growth, wood quality and even perhaps for its nitrogen-fixing capabilities. There are numerous species which may be native to one part of the state but not others. One example of this, bald cypress, Taxodium distichum, is native to southwestern portions of the state where bald cypress swamps can be found, but it wasn’t historically found in the dunes of northwestern Indiana. A map of its native range can be found here.
I commonly have the discussion of the “official definitions” of invasive, non-native, exotic, aggressive, noxious, weed, etc., with folks. These definitions are an area of much debate in scientific literature and among professionals that regularly work to manage these species. It is my belief that “invasive” species can be both exotic (not from the geographical region in question) and native (belonging to the geographical region in question), just like exotic species don’t have to be invasive (grow and spread aggressively). Noxious plants (“any plant, or plant product, that can directly or indirectly injure or cause damage to….”) can fit into each of those descriptions, and then of course, there is the definition of a weed…a plant that grows in an area that we don’t want it to. Everyone has their own opinion though, right?
There are many places to look up species-specific information on a state-to-state as well as a county-to-county level. For example, I like to use two websites: www.bonap.org and plants.usda.gov. Unfortunately, there are so many species and so many records that are needed to update these types of databases that they may not accurately represent what is truly out there. Plus there are the differences between historical records and current records which can bring about another debate.
So to wrap this thing up and provide short answers to Scott’s questions:
Q: Is black locust native to the state?
A: Yes.
Q: Can black locust be invasive in prairie and savanna habitats?
A: Absolutely! It spreads aggressively into these environments, especially in the absence of disturbance (another topic for another posting…).
Q: Is it invasive in woodlands or just open areas or what is the deal?
A: Mostly in open areas. It doesn’t tolerate high shade very well.
Q: Any idea why websites don’t suggest to “buy, sell or plant” even though they list it as an invasive (paraphrased)?
A: No, I don’t. That said, I am not familiar with where to buy seedlings, but then again, I don’t have an interest in planting them!
In closing, would I plant black locust? No, I wouldn’t unless I intended to use the trees as a crop. Black locust makes great firewood and great fence posts, and the flowers taste pretty good in the spring. However, they can grow and spread quite aggressively through root suckers as well as by seed. Commonly the little patch of a few trees turns into acres and acres!
Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
ID That Tree of Indiana: Black Locust, Purdue Extension – FNR blog post
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
Episode 11 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
An Introduction to Trees of Indiana, The Education Store
Professional Forester, Indiana Forestry Woodland Owners Association
Forest Improvement Handbook, The Education Store
Find an Arborist, International Society of Arboriculture
Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources
As this long, hot summer heads toward fall, trees will be doing their best to place some new offspring on the landscape. Some tree seed gets a lift on wind or water to new growing locations. Some seed will count on being eaten and then excreted by a bird. We are perhaps most familiar with the activities of squirrels in gathering and storing seed like acorns, hickories and walnuts. Foresters are rather fond of gray and fox squirrels – they collect seed and bury it in scattered locations around their home range for later excavation and use. What the forester likes is the squirrels don’t always re-find all the buried nuts, so a new tree may result. If you have an interest in growing trees or just want to get in touch with the world of squirrels, you could consider gathering and planting some tree seed.
Oaks, walnuts and hickories are a good starting point for using seed to grow new trees. Start scouting for seed on the trees in your neighborhood, local parks or even cemeteries. Be sure you have permission to pick up seed if it is private property. Some seed is already being eaten by squirrels or falling from trees, so now is a good time to start looking, although prime seed collection time is usually mid-September to October. Acorns, walnuts and hickory nuts will drop from the trees when ripe, so keep an eye on the ground. Before collecting a lot of seed, check the quality of the seed by cutting or cracking a few sample seed. You may need pruning shears, or in the case of walnuts and hickories, a hammer to open the seed. Viable seed should be firm and white or light tan inside with no signs of insect infestation. Weevil grubs are fairly common in oak seed, so discard seed that has obvious small holes from weevils or with the cap still attached (with the exception of bur oak which retains its caps).
Figure a percentage of good seed from your test lot to see how many total seed you need to collect to get the number of good seed you want. Keep your collected seed cool and moist until you plant it. Plant as soon after collection as possible. A good general guide for planting depth is one to two times the diameter of the seed, so a walnut would be planted one to two inches below ground surface. Squirrels can locate buried seed, so you may want to protect seed from squirrels by covering the planting spot with wire mesh sheets or cones anchored to the ground. Another easy protection method is a tin can with one end completely removed and an X cut in the middle of the other end with the corners pulled back to create a hole. Dig a hole approximately the size of the can. Place the seed and soil in the can and then push the open end of the can down until the cut end is flush with ground line. The seedling can then grow out through the hole in the cut end.
The screens and cans can be removed at the end of the first growing season once leaves have fallen, or if they are steel, simply left to rust away. Aluminum screen or cans will not rust away, so they must be removed. If you are willing to share with the squirrels, just plant a lot more seed. You can also start seed in containers. Half-gallon or gallon milk jugs with a drain hole cut in the bottom would work as would deep planters. Over winter, you should bury or heavily mulch the pots to insulate them from rapid temperature fluctuation.
Many other tree and shrub species may be grown from seed including persimmon, redbud, dogwoods, maples and tulip tree. The particular requirements for best germination and growth for tree seeds varies by species. A great reference for growing almost any native or common introduced tree species from seed is the Woody Plant Seed Manual produced by the U.S. Forest Service. An online version is available at http://www.nsl.fs.fed.us/nsl_wpsm.html.
Resources
Hardwood Seedling Production/Propagation (click Publications, then Research Publications), Hardwood Tree Improvement and Regeneration Center
Germination of Tree Seed, Iowa State University Extension and Outreach
Woody Plant Seed Manual (pdf), U.S. Forest Service
Planting Forest Trees and Shrubs in Indiana, The Education Store
Tree Seedling Nurseries, Indiana Department of Natural Resources
ID That Tree, Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Report Invasive, Purdue Extension
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester 10+acres of woodlands, Indiana Department of Natural Resources
Forest Improvement Handbook, The Education Store
Lenny Farlee, Extension Forester, Hardwood Tree Improvement and Regeneration Center
Forestry and Natural Resources, Purdue University
There are 210,076 video clips. Just subscribe to the U.S. Forest Service Channel, and you can search for the video that will share an exclusive insight of forestry that you have not seen before. You will find videos about forest firefighters, wildlife biologists, climate change, national forests, drought conditions, recreation benefits and teaching our youth about watershed.
Established in 1905, the Forest Service is an agency of the U.S. Department of Agriculture. The Forest Service manages public lands in national forests and grasslands. Gifford Pinchot, the first Chief of the Forest Service, summed up the mission of the Forest Service— “to provide the greatest amount of good for the greatest amount of people in the long run.” National forests and grasslands encompass 193 million acres of land, which is an area equivalent to the size of Texas.
USDA is an equal opportunity provider and employer.
Resources:
USDA Forest Service
U.S. Forest Service Facebook
USDA Forest Service X, @forestservice
U.S. Forest Service Instagram, @u.s.forestservice
Forestry Major, Purdue University – Forestry and Natural Resources
Trees are often the unwilling recipients of proclamations of love, notifications, for sale advertisements and tagging. Most of these activities are relatively harmless to tree health unless there is a significant amount of physical damage to sensitive plant tissue. Fortunately, most of these items can be removed without much problem.
However, paint and other chemical applications can cause additional damage. Paint may clog the tiny openings on trees called lenticels, preventing gas exchange such as CO2 produced by respiration getting out and O2 needed for respiration getting into the tree. Also the paint may interfere with photoreceptors embedded in the stem. When these sensors are covered, it interferes with the tree’s ability to sense changes in light quality, intensity and duration which can disrupt normal plant processes. In addition, the bark and cambium layer can be damaged by absorption of the chemical properties in paints. These paint chemicals, especially those found in oil-based paints, can cause severe damage and even death on thin-barked trees.
The removal process of the paints on trees can create quite a headache in the corrective actions. However, it can be successful with careful work and consideration for the absorptive properties of the tree.
Try to remove graffiti as soon as possible after it is applied. Prompt removal reduces the damage to the tree as most paint products have harmful petroleum distillates and other oil properties in them. Use citrus-based graffiti removal agents that contain ingredients such as “natural orange extract.” Citrus-based degreasers are essentially the same as graffiti removal agents and are more readily available at local retailers. Citrus-based products are mostly biodegradable; they contain very few, if any, hazardous substances, and they rinse clean with water. These degreasers do very little harm to trees. Always read the precautionary statements listed on a product label before using any product.
After applying a citrus-based removal agent, it is usually best to allow the remover to penetrate the graffiti message for a variable amount of time, depending mostly on the length of time the graffiti has remained on the surface. For example, newly applied graffiti can be sprayed with a removal agent and rinsed with satisfactory results in 20 minutes. Graffiti that has been applied for several weeks or months will require the removal agent to sit on the surface for 1-2 hours. Best results are usually achieved by at least two applications of the removal agent before rinsing.
Use a hose with a high-pressure nozzle or better; use a pressure washer to rinse and remove graffiti that has been treated with a removal agent. Be sure to use the pressure washer carefully on tree trunks, especially thin, smooth barked trees to avoid any damage to the tree. High pressure spray can damage the bark and vital tree components if applied intensely in one area. When using a high pressure hose nozzle instead of a pressure washer, it may be helpful to agitate the treated graffiti with a stiff nylon or plastic brush to improve removal efforts. Wire brushes can be damaging to the tree without careful use.
Remember to be gentle and reduce damage to the tree trunk. If the removal process is unsuccessful at first, multiple applications over time may be required. Sometimes a simple, creative aerosol paint combination can be used to cover or disguise the tagging efforts if on a small scale. Be natural and use long, vertical spray strokes to match the tree color as best as possible. Water-based paints are not as harmful as oil-based covers. This is always the last course of action.
Good luck and hopefully the tree can be restored to its natural appearance.
Resources:
Graffiti Removal From Trees, The Education Store, Purdue Extension’s resource center
Find an Arborist website, Trees are Good, International Society of Arboriculture (ISA)
Caring for storm-damaged trees/How to Acidify Soil in the Yard, In the Grow, Purdue Extension
Moist soil and rotten roots makes it easy for trees to come crashing down, Fox 59 News
Why Is My Tree Dying? – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Mechanical Damage to Trees: Mowing and Maintenance Equipment, The Education Store
Construction and Trees: Guidelines for Protection, The Education Store
Trees and Electric Lines, The Education Store
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