Arizona Walnut

Juglans major, Juglandaceae

Zones

7–9

Layer

Canopy

Lifespan

Perennial

Growth

Moderate

Guild Roles

ProducerShade ProviderWindbreakNitrogen Fixer

Growing Conditions

Sun

Full Sun (preferred)

Water

Moderate (established)High (seedling)

Soil pH

6.5 – 8

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

Siberian Wild RyeElymus sibiricus

Wind ProtectionBeneficial Insect Habitat

Antagonistic Plants

Whitebark RaspberryRubus leucodermis

Walnut trees produce juglone which is toxic to many plants including Rubus species, inhibiting their growth.

Barrel medicMedicago truncatula

Juglone from walnut severely inhibits medic growth and nodulation, reducing nitrogen fixation capacity

Western Sand CherryPrunus besseyi

Walnut produces juglone which may inhibit cherry growth in arid regions

Upright cloverTrifolium strictum

Arizona walnut produces juglone which is toxic to most legumes including clovers, inhibiting their growth and nitrogen fixation

Japanese CloverKummerowia striata

Japanese clover is highly sensitive to juglone compounds produced by walnut trees

Yellow Crown VetchCoronilla scorpioides

Walnut juglone is toxic to crown vetch and other leguminous plants

DanchiSesbania aculeata

Juglone from walnut severely affects legume growth including Sesbania species

Uses

Functions

Nut ProductionDesert AdaptationErosion ControlAllelopathy

Edible Parts

Nuts

Medicinal Uses

Astringent

Common Questions

What zones does Arizona Walnut grow in?

Arizona Walnut grows in USDA hardiness zones 7 through 9.

Is Arizona Walnut a nitrogen fixer?

Yes, Arizona Walnut is a nitrogen fixer and can help provide nitrogen to neighboring plants in a guild or polyculture.

What are good companion plants for Arizona Walnut?

Good companions for Arizona Walnut include Siberian Wild Rye.

Design guilds with Arizona Walnut and see companion relationships visually.

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