Does a walnut or evergreen tree near a raspberry bed affect the growth and production of red raspberries? I have not been able to grow raspberries well despite many years of trying. The area where the raspberries are planted is in full sun but just beyond the area shaded by a large black walnut tree.
Thank you for contacting us. With the exception of black raspberries, most other berries are sensitive to juglone, the chemical emitted by black walnuts.I'm afraid there are not a lot of options other than moving your berry patch: http://hort.uwex.edu/articles/black-walnut-toxicity/
I will plan to move the berry patch. Are there other plants I should not plant where the berries currently are, other plants which are affected by the juglone?
These plants are sensitive to Juglone
Vegetables;asparagus, cabbage, eggplant, pepper, potato, rhubarb, tomato
Flowers: autumn crocus, chrysanthemum, forget-me-not, petunia, peonies
Trees: alder, apple and crabapple, basswood, pine, spruce, silver maple, white birch
Shrubs and Vines: azalea, blackberry (and most berries other than black raspberry), cotoneaster, hydrangea, lilac, mountain laurel, potentilla, privet, rhododendron, yew
Field Crops and Grasses: alfalfa, tobacco
The following plants are tolerant of Juglone:
Vegetables: beans, beet, carrot, corn, melon, onion, parsnip, squash
Flowers: aster, astilbe, bee balm, begonia, black-eyed Susan, bluebell, calendula, crocus, daylily, ferns, grape hyacinth, some hosta varieties, hollyhock, impatiens, Jack-in-the-pulpit, Jacob’s ladder, marigold, morning glory, pansy, phlox, Siberian iris, squill, sweet woodruff, trillium, zinnia
Trees: black locust, catalpa, Eastern redbud, hackberry, Canadian hemlock, hickory, most maples, oaks, pagoda dogwood, poplar, red cedar
Shrubs: arborvitae, bittersweet, black raspberry, clematis, currant, forsythia, euonymus, greenbrier, most honeysuckle, pachysandra, rose-of-Sharon, sumac, most viburnum, Virginia creeper, wild grape, wild rose, willow, witch hazel
Grasses and field crops: fescue, Kentucky bluegrass, orchard grass, soybean, timothy, wheat, white clover
In addition to the list Kirsten sent you, this Extension bulletin from Ohio may help you. It includes plants that are sensitive as well as those that tolerate juglone.