English Walnut
Juglans regia, Juglandaceae
Guild Roles
Growing Conditions
Sun
Water
Soil pH
6 – 7.5
Tolerances
Companion Plants
Antagonistic Plants
English walnut juglone damages tomatoes
CabbageBrassica oleracea var. capitataWalnut trees produce juglone which is toxic to many vegetables including cabbage, causing stunted growth and yellowing.
Romaine LettuceLactuca sativa var. longifoliaRomaine lettuce is highly sensitive to walnut juglone, showing rapid wilting and death when grown near walnut trees.
Brussels SproutsBrassica oleracea var. gemmiferaBrussels sprouts are highly susceptible to juglone poisoning from walnut trees
Collard GreensBrassica oleracea var. viridisCollard greens are severely affected by juglone toxicity from walnut trees
Sand CherryPrunus pumilaSand cherry is sensitive to juglone and cannot survive near walnut trees
SoursopAnnona muricataSoursop is sensitive to juglone and may suffer growth inhibition near walnut trees
AppleMalus domesticaEnglish walnut produces juglone, a natural herbicide that inhibits the growth of many plants including apple trees.
BroccoliBrassica oleracea var. italicaBroccoli is sensitive to juglone produced by walnut trees, leading to poor growth and potential plant death.
KaleBrassica oleracea var. sabellicaWalnut juglone severely inhibits kale growth, causing chlorosis and stunted development.
Common ReedPhragmites australisWalnut trees produce juglone which can inhibit growth of many plants including grasses
English IvyHedera helixEnglish ivy may be sensitive to juglone produced by walnut trees
CauliflowerBrassica oleracea var. botrytisWalnut juglone toxicity prevents normal growth and development of cauliflower
RapeseedBrassica napusRapeseed is highly sensitive to juglone and cannot survive near walnut trees
Brown MustardBrassica junceaBrown mustard is severely inhibited by juglone compounds from walnut trees
Black MustardBrassica nigraBlack mustard cannot tolerate juglone toxicity from walnut trees
Tepary BeanPhaseolus acutifoliusTepary beans are susceptible to juglone toxicity from walnut trees
Tree CollardsBrassica oleracea Tree CollardTree collards, being brassicas, are highly susceptible to walnut juglone toxicity
Uses
Functions
Edible Parts
Common Questions
What zones does English Walnut grow in?
English Walnut grows in USDA hardiness zones 5 through 9.
What are good companion plants for English Walnut?
Good companions for English Walnut include Shrub Bush Clover.
Design guilds with English Walnut and see companion relationships visually.
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