plant

Swede rapeseed

Brassica napus

Updated 4 Aug 2026 · AI-parsed entry

Swede rapeseed (Brassica napus) — a plant, for Full sun, Medium water. Companions: Onion, French marigold.

What it needs & gives back

↓ Needs

Lightfull sun to partial shade
Watermoderate

↑ Gives back

Mulch_biomasshigh

Companions

Through the year

Through the year

JFMAMJJASOND
emergenceSeeds germinate and seedlings emerge when soil temperatures are consistently above 5°C.
floweringFlowering is initiated by lengthening days and air temperatures above 10°C.
fruitingFruit (siliques) development begins approximately 30 days after flowering.
harvestHarvest occurs when seeds are mature, typically 45 days after fruiting begins.
senescencePlants begin to senesce with the onset of the first autumn frosts.

Soil interactions

Drainagewell-drained
Nitrogen fixingNo
MycorrhizalNo
Accumulatessulfur, boron
Soil textureloam, silt
Organic matterMedium
Compaction toleranceLow

Propagation

Methodsseed
Difficulty1 / 5
Establishes in~1 yr
Self-seedingModerate

Wildlife & pests

Attractspollinators
Can host pestscabbage worms, flea beetles, aphids
Can host diseasesclubroot, black rot