Trees

Newly planted urban trees are at risk of mortality if proper after-planting care, such as mulching and watering, is not carefully tended.

Urban Tree Planting

Spring is a time of an awakening plant world full of blooms and endless possibilities for the coming growing season.  It’s a time that many of us think about updating our landscaping, making it the most popular time of year to plant trees and shrubs.  When you combine the mild...
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Hollies are symbolic of the holiday season, providing beauty in the landscape as well as abundant berries for native birds. Photo Credit: Diane Plewa, Illinois Extension Plant Clinic

Holly for the Holidays

Broad-leafed and evergreen holly species have long been a symbol of Christmas and other winter holidays and traditions.  The dark green, prickly foliage combined with contrasting bright red berries can really be a show stopper in the winter landscape providing both ornamental beauty and food...
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This young swamp white oak (Quercus bicolor) has retained its leaves while the maples on either side have already dropped theirs.  Many of our native oaks keep their leaves all winter as young trees.

Why do some trees retain leaves over winter?

Not all trees shed their leaves in coordination during fall. You may have noticed that some trees are still holding their leaves this week, and many of those will likely hold them until spring. Each winter, I get a number of questions on this topic as folks ponder the “not-so-deciduous” deciduous...
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Fall Color in Oaks

Fall color is beginning to paint tree canopies around central Illinois, making the next few weeks prime time for taking in the beauty.   Among our native trees, sweet gum (Liquidambar styraciflua), red maple (Acer rubrum) and sugar maple (Acer saccharum)...
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Benefits of Urban Trees

Urban trees provide beauty and definition to our cities and most of us have a love and appreciation of these denizens of the boulevard and backyard.  In recent years, a body of research has emerged showing even greater benefits than previously understood to both the environment and our...
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Fall Tree Planting

Most folks think of spring as the ideal planting time for trees and shrubs.  However, fall offers a nice planting window with some added benefits over the spring season, making it my favorite time of year to establish woody plants. Fall weather can create ideal planting conditions, with...
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Poisonous Plants

How many times have you been kept up at night worrying about a poisonous plant?  Hopefully, for most of us the answer to that question will be ‘not many’.  For better or worse, humankind has not always had a well-defined separation from the plant world as we often see today.  With...
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The green foliage in this picture is bush honeysuckle, which is an invasive species that dominates forest understories in Illinois. If not weeded out...

Weeding out Invasives

The management of Illinois’ forests has become an increasingly difficult task for landowners focused on maintaining and enhancing native plant diversity. I have often thought of it as a similar process to weeding a vegetable garden, with a diverse mix of our native forest trees as the vegetable...
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illinois forest

Forest Management, HIPP and RCPP

The management of Illinois’ forests has become an increasingly difficult task for landowners focused on maintaining and enhancing native plant diversity.  I have often thought of it as a similar process to weeding a vegetable garden, with a diverse mix of our native forest trees as the...
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This rhododendron shoot is infected with the pathogen Phytopthora ramorum, displaying the typical symptoms of ramorum blight. PC UI Plant Clinic

Rapid Response to Ramorum Blight

In early July, the Illinois Department of Agriculture submitted a press release detailing the detection of a new pathogen in Illinois that threatens our native oaks. This non-native pathogen is the causal agent for a very serious disease known as sudden oak death. However, there may be some good...
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