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.
  • Attract butterflies and pollinators, especially native bees.

Native Habitats:Sandhills, scrub, scrubby flatwoods.

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:Amorpha herbacea subsp. crenulata is Endemic to Dade County.  Considered to by Endangered by the State of Florida and by the USFWS.  It is found in pine rocklands and in marl prairies (trasverse glades).