Juglone and livestock

Asked January 11, 2019, 6:39 PM EST

I have a few black walnut trees along edge of pasture where hay fields will be. Does juglone actually get into the plant/grass and make the grass toxic for livestock? I understand that all parts of tree are bad, but what about the plant next to walnut tree. Assuming that plant is growing of course. I dont want to poison anyones livestock with toxic hay. Thanks -jon

Wilson County Texas livestock walnut trees

4 Responses

Thanks for your question, Jon. Here is an Extension article you should read carefully to apply to your situation: https://extension.umd.edu/learn/toxic-plant-profile-black-walnut Hope it is helpful. Good luck!

It still doesnt answer if it spreads to surrounding plants. ie, juglone gets into neighboring grass. Or is juglone something plants dont take in and it just suffocates them from outside? Juglone sounds like it invades and kills neighboring plants.

It still doesnt answer if it spreads to surrounding plants. ie, juglone gets into neighboring grass. Or is juglone something plants dont take in and it just suffocates them from outside? Juglone sounds like it invades and kills neighboring plants.

Juglone does not ‘invade’ other plants. When walnut plant tissue is close to live plants, the roots of the other plants just absorb the chemical. The article says that turf (lawn) and pasture grasses are not affected by juglone. Juglone is either present in the soil in one place or it isn’t It does not spread. It is not a bacteria, fungus or virus that is alive. It is like putting a solid poison in a container and planting it. It only poisons what is close to it.