rape
Brassica napus · Brassicaceae
rape (Brassica napus) is a biennial herbaceous plant in the Brassicaceae family. It is introduced to North America rather than native. USDA records it as hardy in zone 8 and warmer, down to about 17°F.
⚠ Invasive or noxious status. USDA lists this plant with an invasive or noxious weed status somewhere in its range. Check your state's noxious weed list before planting it — in some states it is illegal to sell or plant.
Both flags are quoted from USDA PLANTS, not inferred.
At a glance
| Type | forb-herb USDA |
|---|---|
| Lifecycle | biennial USDA |
| Native status | introduced USDA |
| Mature height | 4 ft USDA |
| Light | full-sun USDA |
| Water need | medium USDA |
| Growth rate | rapid USDA |
| Soil pH | 6–7.2 USDA |
| Bloom | March–April USDA |
| Flower color | Yellow USDA |
| Hardiness zones | 8 and warmer USDA |
| Guild layer | herb-layer Derived |
| Nursery availability | Contracting Only 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 needs full sun. USDA rates it as having moderate water needs. Its drought tolerance is rated low. It will not tolerate waterlogged soil — USDA rates its anaerobic tolerance as none. It is recorded on soils from pH 6 to 7.2 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 8.
Size and growth
At maturity it reaches about 4 ft, making it roughly waist to chest height. It grows quickly.
Bloom period
USDA records a bloom period of March through April. Flowers are yellow.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is dark green, coarse in texture. Its flowers are conspicuous. It carries conspicuous autumn colour. Its active growth period is fall, winter and spring. Its winter foliage is dense, which makes it useful for year-round screening.
What the site needs to provide
USDA records it across sites receiving 40 to 80 inches of annual precipitation. It needs at least 130 frost-free days to finish its season. It roots to at least 6 inches. Fertility requirement: medium.
Propagating it
Seed is the only propagation method USDA lists. Division and cuttings are not listed as options. USDA records no cold-stratification requirement, so seed should germinate without a chilling period. Its seed spreads at a moderate rate. It does not spread vegetatively, so it will stay where you put it.
Resilience and wildlife
Browsing animals find it moderately palatable, so expect deer and rabbits to take an interest. Its fire tolerance is rated none. Its growth form is recorded as single crown.
Role in a guild
Herb layer. In a layered planting this is the herbaceous middle — perennials and grasses that fill the space between ground cover and shrubs. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Others in Brassica
- brown mustard Brassica juncea
- field mustard Brassica rapa
Similar role and hardiness
- pitted beardgrass Bothriochloa pertusa
- California oatgrass Danthonia californica
- Kleberg's bluestem Dichanthium annulatum
- needlegrass rush Juncus roemerianus
- crimson fountaingrass Pennisetum setaceum
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol BRNA, 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, Bloom, Bloom end, browse palatability, cold stratification, Drought tolerance, Edible, 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, Invasive status, Lifecycle, 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, Type, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer.
Read our full data sources and methodology.
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