Because of a substance produced by the Black Walnut's roots (called
'Juglone'), many plants will not thrive or even live within their driplines.
There *are* plants that are not affected by Juglone. From
http://www.ppdl.purdue.edu/ppdl/expert/Juglone.html:

"The following landscape plants have been observed to be tolerant to
juglone: arborvitae, autumn olive, red cedar, catalpa, clematis, crabapple,
daphne, elm, euonymous, forsythias, hawthorn, hemlock, hickory, honeysuckle,
junipers, black locust, Japanese maple, maple (most), oak, pachysandra,
pawpaw, persimmon, redbud, rose of sharon, wild rose, sycamore, viburnum
(most), Virginia creeper."

Dave

"Sis" wrote in message
...
I have a partly wooded backyard with many Black Walnut trees. Many
plants,trees and shrubs won't survive when grown close to them Does any
kind
person have experience in growing anything near them?One of the things I
want to plant are hemlock trees nearby. Can anyone give me some advice on
that and/or other trees/shrubs? Thanks. S.