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College of Agricultural, Consumer & Environmental Sciences Illinois Extension

Shrubs

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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burning bush

Burning Bush

This past week, the vivid red leaves of our native maples have really stolen the show, reaching near peak fall color for the year.  I have always loved the brilliant red colors of autumn leaves, making burning bush (Euyonomous alata) an old favorite of mine. However, in recent...
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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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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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Butterfly milkweed is the only Illinois milkweed with orange flowers, which provide a showy display each summer, often blooming a second time around early

Illinois has an Abundance of Milkweeds

In recent years, milkweeds have gained attention from the public due to their exclusive relationship with the imperiled monarch butterfly. I think many of us are familiar with common milkweed (Asclepius syriaca), which reminds me of childhood leaf picking experiments to see the characteristic sap...
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The ‘Annabelle’ hydrangea is a cultivar that was originally collected from a wild specimen in southern Illinois and remains one of the most popular in production today.

The 'Annabelle' Hydrangea

The ‘Annabelle’ hydrangea has been a mainstay of the ornamental shrub world since its release in the 1960’s.  This showy shrub is filled with beautiful snowball-like flowers that adorn its spindly branches each summer.  The blooms begin as pretty green puffs that turn white at maturity,...
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Boxwoods

Boxwood shrubs are perhaps one of the most planted evergreen shrubs in landscapes around the Midwest.  Although they are typically fairly hardy in our area, many suffer from winter injury.  In addition, there are a number of other ailments for this shrub that gardeners should be aware of...
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2019 Gardening Goals

Winter is an excellent time for reflection on the past year’s growing season and any gardening successes or failures to account for next year.  In this season of multitudes of seed catalog mailings, I have found it to be an ideal time to set gardening goals for the coming year during the down...
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College of Agricultural, Consumer & Environmental Sciences Illinois Extension

101 Mumford Hall (MC-710)

1301 W. Gregory Dr.

Urbana, IL 61801

Email: extension@illinois.edu

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