plant

Sunflower

Helianthus annuus

Updated 4 Aug 2026 · AI-parsed entry

Sunflower (Helianthus annuus) — a plant, for Full sun, Medium water. Companions: Tomato, Common bean.

What it needs & gives back

↓ Needs

Lightfull sun
Watermoderate to high

↑ Gives back

Mulch_biomasshigh
Seedshigh
Nectarhigh
Pollenhigh

Companions

Through the year

Through the year

JFMAMJJASOND
emergenceSeeds germinate and emerge when soil temperatures consistently reach 10°C or higher.
floweringFlowering typically begins 60-90 days after emergence, depending on the variety and growing conditions.
fruitingSeed development follows flowering, with seeds maturing over approximately 30 days.
harvestHarvest occurs when the back of the flower head turns yellow and the seeds are plump and firm, typically 15-30 days after fruiting is complete.
senescencePlants begin to senesce and die back with the onset of the first autumn frosts.

Soil interactions

Drainagewell-drained
Nitrogen fixingNo
MycorrhizalYes
Accumulatesboron, potassium, phosphorus
Soil textureloam, sandy_loam
Organic matterMedium
Compaction toleranceLow

Propagation

Methodsseed
Difficulty1 / 5
Establishes in~0 yr
Self-seedingModerate

Wildlife & pests

Attractsbees, birds, beneficial_insects
Can host pestsaphids, cutworms, sunflower_moths
Can host diseasesrust, powdery_mildew, sclerotinia_rot