Roughhairy Indigo (Hirsuta)

The Roughhairy Indigo (Hirsuta) is generally described as an annual subshrub or forb/herb. This is not native to the U.S. (United States) and has its most active growth period in the spring and summer . The Roughhairy Indigo (Hirsuta) has green foliage and inconspicuous purple flowers, with a moderate amount of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the late summer, with fruit and seed production starting in the fall and continuing until winter. Leaves are not retained year to year. The Roughhairy Indigo (Hirsuta) has a short life span relative to most other plant species and a moderate growth rate. At maturity, the typical Roughhairy Indigo (Hirsuta) will reach up to 5 feet high, with a maximum height at 20 years of 0 inches.

The Roughhairy Indigo (Hirsuta) is not commonly available from nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed. It has a moderate ability to spread through seed production and the seedlings have medium vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 17°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Moderate
General Type Subshrub, Forb/herb
Growth Period Spring, Summer
Growth Duration Annual
Lifespan Short
Plant Nativity Introduced to U.S.
Commercial Availability No Known Source
Physical Characteristics
Bloom Period Late Summer
Displays Fall Colors No
Shape/Growth Form Bunch
Drought Tolerance Medium
Shade Tolerance Intolerant
Height When Mature 5
Vegetative Spread None
Flower Color Purple
Flower Conspicuousness Yes
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Fall Winter
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Seed
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 17
Soil Depth for Roots 8
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Moderate
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5–8 pH
Precipitation Range 30–30 inches/yr
Planting Density 0–0 indiv./acre
Soil Textures Fine, Medium
Soil Depth for Roots 8
Minimum Frost-Free Days 110 day(s)
Salinity Tolerance Low
CaCO3 Tolerance None
Sustainability & Use
Leaf Retention No
Palatability Low
Fire Resistant No
Causes Livestock Bloating Low

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA