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Pitch Trefoil

Psoralea bituminosa, Fabaceae

Zones
7–10
Layer
Herbaceous
Lifespan
Perennial
Growth
Moderate

Guild Roles

Nitrogen FixerGround CoverDynamic Accumulator

Growing Conditions

Sun

Full Sun (preferred)

Water

Low (established)Moderate (seedling)

Soil pH

6.5 – 8.5

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Companion Plants

Taiwanese RaspberryRubus parvifolius var. taiensis
Nitrogen FixationBeneficial Insect Habitat
Field PennycressThlaspi arvense
Nitrogen FixationPest Deterrent
Ethiopian MustardBrassica carinata
Pest DeterrentNitrogen Fixation

Antagonistic Plants

Prairie TurnipPsoralea esculenta

Psoralea species known to produce allelopathic compounds that can inhibit related species

Uses

Functions

Nitrogen FixationDrought-Tolerant CoverDeep Soil PenetrationErosion Control

Medicinal Uses

Wound HealingSkin Conditions

Common Questions

What zones does Pitch Trefoil grow in?

Pitch Trefoil grows in USDA hardiness zones 7 through 10.

Is Pitch Trefoil a nitrogen fixer?

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

What are good companion plants for Pitch Trefoil?

Good companions for Pitch Trefoil include Taiwanese Raspberry, Field Pennycress, Ethiopian Mustard.

Design guilds with Pitch Trefoil and see companion relationships visually.

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