Horse Chestnut Trees

Juglone and Horse Chestnut


Anonymous added on September 20, 2011 | Answered

Will juglone in black walnut affect the growth of horse chestnuts in our yard? If we planted them, they would be planted within the dripline of the black walnut.


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ANSWERS
Nikki
Certified GKH Gardening Expert
Answered on September 21, 2011

It would be a race to the finish for them as the Horse Chestnut is also alleopathic (poisonous to other plants). Typically, the alleopathy of these plants can be greatly reduced by making sure that their leaves and fruits are removed from the ground in the fall. This typically reduces the area of alleopathy to just a few feet around the trunk. If you feel you can be diligent about that, then these two trees can be planted close to each other.

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