Perennial Soybean (Wightii)

The Perennial Soybean (Wightii) 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 year round . The greatest bloom is usually observed in the indeterminate, with fruit and seed production starting in the spring and continuing until spring. Leaves are retained year to year. The Perennial Soybean (Wightii) has a long life span relative to most other plant species and a moderate growth rate. At maturity, the typical Perennial Soybean (Wightii) will reach up to 2.5 feet high, with a maximum height at 20 years of 0 inches.

The Perennial Soybean (Wightii) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by bare root, container, 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 50°F. has high tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Moderate
General Type Vine, Forb/herb
Growth Period Year Round
Growth Duration Perennial
Lifespan Long
Plant Nativity Introduced to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Indeterminate
Displays Fall Colors No
Shape/Growth Form Single Stem
Drought Tolerance High
Shade Tolerance Intermediate
Height When Mature 2.5
Vegetative Spread Slow
Flower Color White
Flower Conspicuousness No
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Spring Spring
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 50
Soil Depth for Roots 12
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Rapid
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5.5–7.8 pH
Precipitation Range 15–15 inches/yr
Planting Density 1000–40000 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 12
Minimum Frost-Free Days 350 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention Yes
Palatability High
Fire Resistant No
Causes Livestock Bloating None

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