The Four Seasons Gardening Webinar Series is one of the most popular horticulture programs offered by the Illinois Extension Horticulture Team. Each season, the team hosts three live webinars delivered via Zoom. Webinars are free but registration is required and space is limited. Please click on the topics below to register. Webinars are held on select Tuesdays at 1:30 p.m. CDT.

If you need live captioning support to participate in any of these programs, please contact Andrew Holsinger at It is strongly encouraged to submit your request at least two weeks before the program begins.

Fall 2020

Hardscaping Basics for Patios and Retaining Walls 

September 15, 2020 at 1:30 p.m. Central Daylight Time

Do you have a vision of a retaining wall or patio in your yard, but aren’t quite sure where to start? Hardscape installation can cost thousands of dollars and many homeowners are turning to DIY to save some money. However, there is a lot to know about proper hardscape installation methods. Join University of Illinois Extension Horticulture Educator, Chris Enroth, as he talks about the basics of modular patio paver and retaining wall installation. 


Creating a Bottle Terrarium

October 13, 2020 at 1:30 p.m. Central Daylight Time

Explore the enclosed world of bottle terrariums, self-contained plant environments within glass. Join Horticulture Educator, Bruce J. Black, to explore terrariums, their needs and how to create a bottle version of a terrarium.


History of Forest Pest Outbreaks in North America

November 17, 2020 at 1:30 p.m. Central Standard Time

North America has a history of exotic pests that extirpate individual tree species, with Emerald Ash Borer serving as our modern example. In our current, ever-globalizing society there is significant risk for future outbreaks that may impact our trees from the urban forest to our woodlands. Join University of Illinois Extension Horticulture Educator Ryan Pankau as he examines past outbreaks on our continent to compare what we have learned historically with the current pests threatening our native trees.

Webinar Archives

Each program is recorded and uploaded to Illinois Extension Horticulture YouTube channel. To allow time for closed captioning edits, please check the YouTube channel about two weeks after the scheduled program.