perennial soybean
Neonotonia wightii · Fabaceae
perennial soybean (Neonotonia wightii) is a perennial vine in the Fabaceae family. It is introduced to North America rather than native. USDA records it as hardy in zone 12 and warmer, down to about 50°F.
At a glance
| Type | vine Derived |
|---|---|
| Lifecycle | perennial USDA |
| Native status | introduced USDA |
| Mature height | 2.5 ft USDA |
| Light | part-shade USDA |
| Water need | medium USDA |
| Growth rate | moderate USDA |
| Soil pH | 5.5–7.8 USDA |
| Flower color | White USDA |
| Hardiness zones | 12 and warmer USDA |
| Guild layer | climber Derived |
| Nursery availability | Routinely Available USDA |
USDA quoted from the USDA PLANTS database · Derived computed by a fixed rule from those columns. No value on this page is estimated.
Growing conditions
It grows in partial shade. USDA rates it as having moderate water needs. Its drought tolerance is rated high. It will not tolerate waterlogged soil — USDA rates its anaerobic tolerance as none. It is recorded on soils from pH 5.5 to 7.8 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 12.
Size and growth
At maturity it reaches about 2.5 ft, making it about knee height. It grows at a moderate rate.
Foliage, flower and season
Summer foliage is green, medium in texture. Its flowers are not conspicuous — a plant for form and foliage. Its active growth period is year round. Its winter foliage is dense, which makes it useful for year-round screening. USDA rates its lifespan as long.
What the site needs to provide
USDA records it across sites receiving 15 to 80 inches of annual precipitation. The low end of that band is genuinely arid, so it has a wide tolerance for dry country. It needs at least 350 frost-free days to finish its season. It roots to at least 12 inches. Fertility requirement: medium.
Propagating it
Propagate it from seed, bare root and container stock. USDA records no cold-stratification requirement, so seed should germinate without a chilling period. Its seed spreads at a moderate rate. It spreads vegetatively at a slow rate.
Resilience and wildlife
Browsing animals find it highly palatable, so expect deer and rabbits to take an interest. Its fire tolerance is rated medium. Its growth form is recorded as single stem.
Role in a guild
Climber. In a layered planting this is it uses other plants or structures for vertical support rather than standing on its own. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Similar role and hardiness
- oval-leaf clustervine Jacquemontia ovalifolia
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol NEWI2, or is computed from those values by a fixed rule. Nothing here is estimated or model-generated. Where USDA publishes no value, this page omits the claim rather than filling the gap.
- Quoted from USDA PLANTS: active growth period, browse palatability, cold stratification, Drought tolerance, fall conspicuous, fertility requirement, fire tolerance, Flower color, flower conspicuous, foliage color, foliage porosity winter, foliage texture, frost free days min, fruit conspicuous, growth form, Growth rate, Hardiness zones, Lifecycle, lifespan, Light, Mature height, Minimum temperature, Native status, Nitrogen fixation, Nursery availability, precipitation max in, precipitation min in, propagation, resprout ability, root depth in, seed spread rate, Soil pH, Soil pH (upper), Tolerance of wet soil, Toxicity, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer, Type.
Read our full data sources and methodology.
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