Walnut trees produce juglone, a natural herbicide that inhibits the growth of many fruit trees including apples, causing stunted growth and reduced fruit production.

Pacific PlumPrunus subcordata

Juglone produced by walnut trees is toxic to stone fruits including plums, causing wilting, yellowing, and eventual death of sensitive plants.

Schubert ChokecherryPrunus virginiana

Walnut allelopathy affects most Prunus species, with juglone causing root damage and inhibiting nutrient uptake in chokecherry.

Pacific CrabappleMalus fusca

Black walnut species produce juglone, which is toxic to many rosaceous plants including apples and crabapples, inhibiting their growth and potentially killing them.

Greengage PlumPrunus cerasifera

Stone fruits like plums are sensitive to juglone produced by walnut trees, leading to poor growth and potential plant death.

Aprikyra PlumcotPrunus × dasycarpa

Plumcot hybrids retain sensitivity to juglone from their Prunus parentage, making them incompatible with walnut trees.

Uses

Functions

Nut ProductionTimberWildlife Habitat

Edible Parts

Nuts

Medicinal Uses

Omega-3 Fatty Acids

Common Questions

What zones does Iron Walnut grow in?

Iron Walnut grows in USDA hardiness zones 6 through 9.

What are good companion plants for Iron Walnut?

Good companions for Iron Walnut include Black Sclerotial Fungus, Scaly Hedgehog Mushroom, Umbrella Polypore, Yellow False Truffle.

Design guilds with Iron Walnut and see companion relationships visually.

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