Lupinus diffusus

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Sky Blue Lupine

Fabaceae (Leguminosae)

Plant Specifics

Size:2.5-3.5 ft tall by 1-3 ft wide
Life Span:Biennial
Flower Color:Blue, lavender
Fruit Color:Green
Phenology:Naturally sprouts in autumn and blooms the following year in mid-spring.
Noted for:Showy flowers, Showy fruits, Interesting foliage


Recommended Uses:Wildflower garden where it can be used as a specimen plant.
Considerations:Hard to establish. Biennial, though may reseed.
Propagation:Seed. Known to be difficult to transplant especially if roots are disturbed.
Light: Full Sun
Moisture Tolerance:
always floodedextremely dry
 (Short very dry periods ----- to ----- Very long very dry periods)
Moisture Tolerance: Short very dry periods ----- 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:Acidic



  • Larval host for  frosted elfin (Callophyris irus) butterfly, which is listed as  Endangered in Florida. 
  • Also larval host for gray hairstreak (Strymon melinis) butterfly,  Genista broom moth (Uresiphita reversalis)a nd other butterflies and moths that use members of the Fabaceae family (FNPS blog).
  • Attracts bees including bumblebees.  Documented visitors include Anthidiellum notatum rufimaculatum, A. perplexum, Megachile exilis parexilis, Osmia sp. and Bombus griseocollis (Deyrup et al. 2002).

Native Habitats:

Distribution and Planting Zones

Natural Range in Florida
USDA Zones

Suitable to grow in:
10A 10B 8A 8B 9A 9B 

USDA zones are based on minimum winter temperatures


General Comments:

Given that this is short-lived (biennial) and difficult to transplant or grow from seed, this is perhaps best encouraged in places where it grows naturally.  Minimizing competition from other plants, and perhaps burning the garden area, may be useful.  This plant appears to have a seedbank with seeds that may sprout over an extended period of years if conditions are right.

The range of this plant in Florida appears to be disjunct though how much of this is due to site conditions and how much could be an artifact of forestry practices is unknown.