Black Wattle

Acacia mearnsii, Fabaceae

Zones

8–11

Layer

Understory

Lifespan

Perennial

Growth

Fast

Guild Roles

Nitrogen FixerPollinator AttractorBeneficial Insect HabitatWindbreak

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

Low (established)Moderate (seedling)

Soil pH

5.5 – 7.5

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

Giant Spear LilyDoryanthes palmeri

Pollinator SharingNitrogen Fixation

Narrow-leaved Palm LilyCordyline stricta

Nitrogen FixationWind Protection

Flame TreeBrachychiton acerifolius

Nitrogen Fixation

Austral ThemedaThemeda australis

Beneficial Insect HabitatWind Protection

Gymea LilyDoryanthes excelsa

Nitrogen FixationNurse Plant

Bookleaf MalleeEucalyptus kruseana

Nitrogen FixationNurse Plant

Antagonistic Plants

Acorn BanksiaBanksia prionotes

Black Wattle aggressive root system and tannins can inhibit Banksia establishment

Creek Mat-rushLomandra hystrix

Black Wattle tannin accumulation in soil inhibits mat-rush establishment

Uses

Functions

Nitrogen FixationErosion ControlWindbreakBee Forage

Edible Parts

SeedsYoung Leaves

Medicinal Uses

AntisepticTannins

Common Questions

What zones does Black Wattle grow in?

Black Wattle grows in USDA hardiness zones 8 through 11.

Is Black Wattle a nitrogen fixer?

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

What are good companion plants for Black Wattle?

Good companions for Black Wattle include Giant Spear Lily, Narrow-leaved Palm Lily, Flame Tree, Austral Themeda, Gymea Lily.

Design guilds with Black Wattle and see companion relationships visually.

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