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Plants That Grow Under Black Walnut Trees

October 6 @ 6:30 pm - 7:30 pm

Rotary Botanical Gardens logo

Presenter: Lisa Johnson, Dane County Extension Horticulture Educator

There is gardening life even in the presence of black walnuts that produce a toxin that negatively affects the growth and survival of other plants. Learn about juglone (the toxin), and a number of woody, perennial and vegetable plants that are susceptible to or resistant to juglone.

Lisa has a bachelor’s degree in Horticulture from the University of Wisconsin-Madison and a master’s degree in Life Sciences Communication. Prior to that she spent 8 years working in the horticulture industry.

She has been the Dane County Extension Horticulture Educator since 2004. Among her responsibilities are training Master Gardener Volunteers, providing continuing education for members of the green industry, overseeing management of the Dane County Extension Teaching Garden, and acting as staff for the Dane County Tree Board.

She gives frequent presentations to garden clubs, schools and libraries in southern Wisconsin, has a weekly column in the WI State Journal and is a regular guest on Larry Meiller’s ‘Garden Talk’ program on Wisconsin Public Radio.

How to register

Note: This is an online event being held via Zoom. A link will be provided via email prior to the event.

To register, please complete a registration form (see below) and submit with your payment in person, by mail, or by phone:

  • In person: at our Garden Gift Gallery (check, cash, or credit card) – Open Monday-Friday 10a.m. – 4:00 p.m.
  • By mail: Send completed form with your check made out to Rotary Botanical Gardens to Attn: Education Coordinator, 1455 Palmer Drive, Janesville, WI 53545. NOTE: Registration and payment must be received prior to the deadline in order to be enrolled in the class. Deadline for this Botanic Talk is 10/4.
  • By phone: Please call (608) 752-3885 to register over the phone with a credit card.
Registration forms


  • Rotary Botanical Gardens members: $7
  • General public: $10

Cancellations & Refunds

Classes cancelled due to low enrollment will be refunded automatically, and you will be notified by phone or email of the cancellation.


Call (608) 314-8415 or email [email protected]


October 6
6:30 pm - 7:30 pm
Event Categories:


Delaney Sherwood
(608) 314-8415