Audio Recording

Linda Chalker-Scott
Extension Specialist and Associate Professor
Washington State University
WSU Puyallup

Chalker-Scott, L.*1,
1 Extension Specialist and Associate Professor, Washington State University, Puyallup, WA, 98371

Gardeners have heard that black walnut trees (Juglans nigra) contain a toxic chemical called juglone that will kill any other plants growing nearby. But is this perception supported by science? Urban Horticulture Extension Specialist Dr. Linda Chalker-Scott talks to Farmer Fred* (Fred Hoffman) on the KFBK Garden Show to explain the origins of this myth and reassure gardeners that black walnut trees in their landscape are not going to injure their other garden plants. (The WSU Extension fact sheet used as the basis for this interview is included as an attachment. It has been downloaded nearly 1000 times since its publication in March 2019.)

This ~13 minute segment is found in the January 12, 2020 broadcast. It runs from 20:32 – 33:55.

*"Farmer Fred" Hoffman is a University of California certified lifetime Master Gardener and garden columnist.