PatternBaseLittle Walnut
Juglans microcarpa, Juglandaceae
Zones
6–9
Layer
Canopy
Lifespan
Perennial
Growth
Moderate
Guild Roles
ProducerDynamic AccumulatorWindbreakShade Provider
Growing Conditions
Sun
Full Sun (preferred)Partial Shade (tolerated)
Water
Low (established)Moderate (seedling)
Soil pH
6.5 – 8
Tolerances
Drought
Frost
Heat
Pest Resistance
Disease Resist.
Companion Plants
Antagonistic Plants
Andean RaspberryRubus glaucus
Little walnut produces juglone which is toxic to raspberry plants, severely inhibiting their growth and survival.
Powderblue Rabbiteye BlueberryVaccinium asheiBlack walnut produces juglone which is toxic to blueberry plants, inhibiting their growth and potentially killing them
Banana Passion FruitPassiflora mollissimaWalnut juglone is toxic to passion fruit vines, preventing establishment and causing die-back
Barrel medicMedicago truncatulaLittle walnut produces juglone which inhibits legume growth in arid regions
Golden Himalayan RaspberryRubus ellipticusLittle walnut juglone production creates toxic soil conditions for Golden Himalayan raspberry
Uses
Functions
Drought-Tolerant Nut ProductionAlkaline Soil ToleranceWildlife Habitat
Edible Parts
Nuts
Medicinal Uses
Bark For Astringent Properties
Common Questions
What zones does Little Walnut grow in?
Little Walnut grows in USDA hardiness zones 6 through 9.
What are good companion plants for Little Walnut?
Good companions for Little Walnut include Giant Wildrye.
Design guilds with Little Walnut and see companion relationships visually.
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