Amorpha herbacea

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Cluster-spike Indigo-bush

Fabaceae (Leguminosae)

Also known as Amorpha herbacea var. herbacea

Plant Specifics

Size:3-4 ft tall by 3-4 ft wide
Life Span:Long-lived perennial
Flower Color:White,lavender
Fruit Color:Brown
Phenology:Deciduous. Blooms spring-summer.
Noted for:Showy flowers, Interesting foliage


Recommended Uses:Can be used as a specimen plant in a sunny spot or as a moderately tall wildflower.
Propagation:Seed, cuttings.
Light: Full Sun,  Part Shade
Moisture Tolerance:
always floodedextremely dry
 (Not wet but not extremely dry ----- to ----- Very long very dry periods)
Moisture Tolerance: Not wet but not extremely dry ----- to ----- Very long very dry periods
Salt Water Flooding Tolerance:Not salt tolerant of inundation by salty or brackish water.
Salt Spray/ Salty Soil Tolerance:Low/no tolerance of salty wind or direct salt spray
Soil or other substrate:Sand
Soil pH:



Larval host for silver spotted skipper (Epargyreus clarus) and southern dogface (Zerene cesonia) butterflies.

Attracts butterflies and pollinators, especially native bees.

Native Habitats:Pine rocklands and in marl prairies (trasverse glades).

Distribution and Planting Zones

Natural Range in Florida
USDA Zones

Suitable to grow in:
10A 8B 9A 9B 

USDA zones are based on minimum winter temperatures


General Comments:

A second subspecies, Amorpha herbacea subsp. crenulata is Endemic to Dade County.  Considered to by Endangered by the State of Florida and by the USFWS.