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 Post subject: Black Walnut Poisoning
PostPosted: Thu Aug 19, 2004 4:44 pm 

Joined: Thu Aug 19, 2004 4:33 pm
Posts: 10
I have read a great deal about the Juglone substance produced by Black Walnut Trees killing off vegetable gardens.
Will this substance have adverse affects on other trees?

Specifically, will it hurt a young Bur Oak?

Will it hurt an established Bur Oak?

thanks for the advice

 Post subject:
PostPosted: Tue Sep 07, 2004 8:47 am 
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Joined: Mon Mar 10, 2003 9:10 am
Posts: 1278
Location: Dallas,TEXAS has answers regarding the effects and nature of juglone. It does, however, state that the statements made are specifically intended for a state other than Texas. I also found: states the following:
Plants produce chemicals which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree[18, 20, 159]. The roots also produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.)[200]. Beans, peas and tomatoes are also particularly sensitive to these secretions and will not grow in the rooting zone[200]. Trees cast quite a dense shade so, along with their other anti-social tendencies, are not very friendly trees for a woodland garden[K].

Nadine Bielling Haefs
Gardener Exchange Forum

The Laws of Ecology:
"All things are interconnected. Everything goes somewhere. There's no such thing as a free lunch. Nature bats last." --Ernest Callenbach

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