permaculture

["Jerome Osentowski" <jerome@crmpi.org>]

I have no direct experience, but mullbery and black locust are used as  
buffer tree and will grow under or next to black walnut.  jerome
--
Jerome Osentowski, Director
Central Rocky Mountain Permaculture Institute
PO Box 631
Basalt, CO 81621   U.S.A.

Tel/fax (970) 927-4158    E mail: jerome@crmpi.org

For more information, please visit our web site at <<www.crmpi.org>>


----------
>From: Mark <mpludwig@facstaff.wisc.edu>
>To: permaculture@lists.ibiblio.org, midwestpermaculture@yahoogroups.com
>Subject: [permaculture] Fwd: Re: [grazersedge] Re: Killer oak trees/walnuts
>Date: Sun, Dec 1, 2002, 11:11 AM
>

>
>>Date: Sat, 30 Nov 2002 18:52:04 -0600
>>From: Lucky Pittman <Lucky.Pittman@murraystate.edu>
>>Subject: Re: [grazersedge] Re: Killer oak trees/walnuts
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>>
>> > > Walnut trees are another tough cookie.   Nothing grows under a
>> >walnut tree,
>> > > not even grasses because that juice from the shell surrounding the
>> >nut is
>> > > apparently toxic to competitors.   And even when that walnut tree
>> >is cut
>> > > and removed, that toxin remains in the soil for years, and nothing
>> >grows.
>>
>>Now y'all are talking about something I know a little bit about.  Many of
>>my friends call me Dr. Nutman(I think it's because of my passion for nut
>>trees ;>)
>>Eastern Black Walnut, J.nigra, does produce juglone - as do the other
>>members of the walnut family - and the hickories, as well.  However, none
>>of the others, with the possible exception of shagbark hickory produce
>>enough of this compound to exert much in the way of an allelopathic
>>effect.  Juglone is produced by the roots, and is also present in the
>>leaves and nut husks, and even after the tree is cut, it may remain in the
>>vicinity of the rootzone for a few years before it all dissipates/leaches
>>away.
>>There are a number of plants which have been shown to be susceptible to
>>juglone toxicity, but most are ornamental plants and garden
>>vegetables.   In most instances, however, the inability of folks to 'grow
>>things' under a big black walnut is because that big old tree, with its
>>extensive root system is better able to outcompete those underplantings for
>>available nutrients and water.  Shading also plays something of a role, but
>>since BW is usually one of the last trees to leaf out in spring and one of
>>the first to lose them in the fall, it's less a factor than with a large
>>maple or oak, but certainly factors into the equation.
>>I've never noticed any real problems with grass growing under - in fact,
>>right up to the trunk - of a big old open-grown BW out in a pasture.
>>
>>Lucky
>>
>>
>>
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>
> Mark P. Ludwig
> Poultry Research Lab
> University of Wisconsin -Madison
> 608-262-1730 WK
> 608-846-7125 HM
>
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