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English Walnut

Juglans regia, Juglandaceae

Zones
59
Layer
Canopy
Lifespan
Perennial
Growth
Moderate

Guild Roles

ProducerShade Provider

Growing Conditions

Sun

Full Sun (optimal)

Water

Moderate

Soil pH

67.5

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Companion Plants

Antagonistic Plants

TomatoSolanum lycopersicum

English walnut juglone damages tomatoes

CabbageBrassica oleracea var. capitata

Walnut trees produce juglone which is toxic to many vegetables including cabbage, causing stunted growth and yellowing.

Romaine LettuceLactuca sativa var. longifolia

Romaine lettuce is highly sensitive to walnut juglone, showing rapid wilting and death when grown near walnut trees.

Brussels SproutsBrassica oleracea var. gemmifera

Brussels sprouts are highly susceptible to juglone poisoning from walnut trees

Collard GreensBrassica oleracea var. viridis

Collard greens are severely affected by juglone toxicity from walnut trees

Sand CherryPrunus pumila

Sand cherry is sensitive to juglone and cannot survive near walnut trees

SoursopAnnona muricata

Soursop is sensitive to juglone and may suffer growth inhibition near walnut trees

AppleMalus domestica

English walnut produces juglone, a natural herbicide that inhibits the growth of many plants including apple trees.

BroccoliBrassica oleracea var. italica

Broccoli is sensitive to juglone produced by walnut trees, leading to poor growth and potential plant death.

KaleBrassica oleracea var. sabellica

Walnut juglone severely inhibits kale growth, causing chlorosis and stunted development.

Common ReedPhragmites australis

Walnut trees produce juglone which can inhibit growth of many plants including grasses

English IvyHedera helix

English ivy may be sensitive to juglone produced by walnut trees

CauliflowerBrassica oleracea var. botrytis

Walnut juglone toxicity prevents normal growth and development of cauliflower

RapeseedBrassica napus

Rapeseed is highly sensitive to juglone and cannot survive near walnut trees

Brown MustardBrassica juncea

Brown mustard is severely inhibited by juglone compounds from walnut trees

Black MustardBrassica nigra

Black mustard cannot tolerate juglone toxicity from walnut trees

Tepary BeanPhaseolus acutifolius

Tepary beans are susceptible to juglone toxicity from walnut trees

Tree CollardsBrassica oleracea Tree Collard

Tree collards, being brassicas, are highly susceptible to walnut juglone toxicity

Uses

Functions

Food

Edible Parts

Seeds

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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