Indigo Bush Seeds

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About & Species

Indigo Bush
(Amorpha fruticosa)

The Indigo Bush is an attractive, fast-growing, thorn-less shrub that grows 15 to 18 feet tall and 30-40 feet in width. Starting in late spring and ending in early summer, the Indigo bush blooms purple violet. The flowering period lasts 2-3 weeks. The Indigo Bush grows well on riverbanks, islands, bogs, pond areas and in water gardens. It is found in most of the United States, Southeastern Canada and Northern Mexico.  

Other Names: False Indigo, Desert False Indigo

Soil Type: Prefers moist soils and dry sands.

Zones: 4 to 9

Germination Range: 60-80%

Stratification Requirement: Hot water treat or scarify for 8 minutes then cold moist stratify for 30-60 days.

Indoor Planting: If your seeds require stratification or scarification – do the recommended pretreatment before planting indoors. Planting Instructions: Fill a container with seed starting mix to about ½ inch from the top. Place your seeds 1 inch to 1 ½ inches below the soil surface. Gently water your seeds to keep moist, not soaking wet. Heat & humidity is critical for germination. Germination may occur in 1 week or as long as 3 months (depending on the species). Place the seed container on a heat mat under growing light(s). Keep your growing lights on 14 hours per day. Keep your heat mat on 24 hours per day. Once your seeds germinate, move each seed into its own container under the growing lights and on the heat mat. Keep your seedlings indoors for 2-3 months before transplanting outdoors in the spring (May to June).

Outdoor Planting: If your seeds do not require stratification: the best time to plant tree and shrub seeds outdoors is after the last frost in your area (spring). In the Northern states – the best time to plant seeds outdoors is from May to June. If your seeds require pretreatment: you should plant your seeds outdoors before the ground freezes in your area (late September to early November). Your seeds will naturally stratify during the cold winter. Germination usually occurs in May or during the spring season.