Tuberous Sweetpea (Tuberosus)

The Tuberous Sweetpea (Tuberosus) is generally described as a perennial vine 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 Tuberous Sweetpea (Tuberosus) has green foliage and inconspicuous purple flowers, with a moderate amount of conspicuous black fruits or seeds. The greatest bloom is usually observed in the mid spring, with fruit and seed production starting in the spring and continuing until summer. Leaves are not retained year to year. The Tuberous Sweetpea (Tuberosus) has a moderate life span relative to most other plant species and a moderate growth rate. At maturity, the typical Tuberous Sweetpea (Tuberosus) will reach up to 1.5 foot high, with a maximum height at 20 years of 0 inches.

The Tuberous Sweetpea (Tuberosus) is not commonly available from nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed, tubers. It has a slow ability to spread through seed production and the seedlings have low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -28°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Moderate
General Type Vine, Forb/herb
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Introduced to U.S.
Commercial Availability No Known Source
Physical Characteristics
Bloom Period Mid Spring
Displays Fall Colors No
Shape/Growth Form Rhizomatous
Drought Tolerance Medium
Shade Tolerance Intermediate
Height When Mature 1.5
Vegetative Spread Moderate
Flower Color Purple
Flower Conspicuousness Yes
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Spring Summer
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Seed, Tubers
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature -28
Soil Depth for Roots 10
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Slow
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 4.8–7.6 pH
Precipitation Range 36–36 inches/yr
Planting Density 11000–21000 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 10
Minimum Frost-Free Days 100 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Palatability Low
Fire Resistant No
Causes Livestock Bloating None

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