There is an interesting article about research on polyclutures with
black walnut trees in the current issue of the Permaculture
Activist. I only gave it a quick skim, but the research covers
something like 35 years and discusses what can do well in walnut
proximity during different stages of the tree's life. Apparently the
article is a synopsis of a paper that is available ($, of course)
here: http://www.springerlink.com/content/n5k623313463t5n6/
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