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Purple Locoweed

Oxytropis lambertii, Fabaceae

Zones
3–8
Layer
Herbaceous
Lifespan
Perennial
Growth
Moderate

Guild Roles

Nitrogen FixerDynamic AccumulatorGround Cover

Growing Conditions

Sun

Full Sun (preferred)

Water

Low (established)Moderate (seedling)

Soil pH

7 – 8.5

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Antagonistic Plants

Two-grooved Milk VetchAstragalus bisulcatus

Both are selenium-accumulating plants that may create toxic soil conditions affecting nearby vegetation

Prostrate Summer CypressKochia prostrata

Kochia produces saponins and other compounds that can inhibit native plant growth

Slender-flowered Scurf PeaPsoralidium tenuiflorum

Both are native legumes that may compete for similar soil conditions in prairie environments

Black PeaLathyrus niger

Both contain toxic alkaloids and may exhibit competitive interactions when grown in proximity

Uses

Functions

Nitrogen FixationDeep Soil MiningAlkaline Soil Adaptation

Common Questions

What zones does Purple Locoweed grow in?

Purple Locoweed grows in USDA hardiness zones 3 through 8.

Is Purple Locoweed a nitrogen fixer?

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

Design guilds with Purple Locoweed and see companion relationships visually.

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