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Invasive Species (Online and In-person)

Schedule and location

Registration will open Tuesday, February 18, 2020.

Section A:

  • Tuesday, May 19, 2020, 11:59 p.m.: Registration closes
  • Wednesday, May 20, 2020, 12:00 p.m.: Online course becomes available
  • Saturday, May 30, 2020: Meet in-person, 8:30 a.m. to 12:30 p.m.
  • Thornhill Education Center

Section B:

  • Tuesday, September 8, 2020, 11:59 p.m.: Registration closes 11:59 p.m.
  • Wednesday, September 9, 2020, 12:00 p.m.: Online course becomes available
  • Saturday, September 19, 2020: Meet in-person, 8:30 a.m. to 12:30 p.m.
  • Thornhill Education Center

Fees and Registration

$39.00 member
$46.00 nonmember
(Fees include admission to the Arboretum)

BY PHONE: 630-719-2468 or to be waitlisted (Monday through Friday, 9:00 a.m. to 4:00 p.m.) 

Course description

Learn to identify and manage the most common invasive plants in the Great Lakes region.  Managing invasive plants is one of the most common restoration tasks. Learn to identify the characteristics of common invasive plants and describe their impacts on the landscape; discuss invasive plant ecology, and learn to which control methods are best suited to each plant.

In this online and in-person class, the self-guided online material can be completed wherever you have access to a computer, but should be completed before you come to the in-person session. This program is part of Illinois Invasive Species Awareness Month, a statewide effort held each May to educate and inform citizens of Illinois about the threat of invasive species.

Course number



Mary Zaandar, Witness Tree Native Landscapes

Mary Zaander works to restore native ecosystems at Witness Tree Native Landscapes as owner and manager, her vocation for 22 years.  Her ecosystem education began as a volunteer in the late 1980’s, continued with a master’s degree from Northeastern Illinois University and is ongoing today both professionally and as a volunteer.

Course details


  • This class is held online and In-person
  • The online materials will take approximately 90 minutes to complete.
  • Participants will have access to the online materials for 60 days after the course start date.
  • Limit 25


  • Participants must have access to the internet and know how to use a web browser (ex: Chrome, Safari, Internet Explorer)
  • Participants must know how to send and receive email.
  • A unique email address for each participant is required at registration.


  • For the in-person session, please dress for the weather and for walking outdoors. A beverage and snack, and writing materials for taking notes in the field are recommended.  Sunscreen or insect repellant may be useful.

Prerequisites: Basic Plant ID (W100) or previous experience with plant identification recommended.
Continuing education: This class fulfills a requirement for the Natural Areas Conservation Training (N-ACT) Program. (Learn more about N-ACT.)
Arboretum class weather, cancellation and refund policies


Invasive Species (Online and In-person)