Asked August 25, 2015, 2:46 PM EDT

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.

Chickasaw County Iowa raspberries juglone horticulture

4 Responses

Dear gardener,

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

from UWisconsin

Dear gardener,

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.