species
Helianthus annuus
Sunflower · Common sunflower
Scale drawing from this record, beside a 1.7 m figure.
Helianthus annuus is a annual in the family Asteraceae, also known as Sunflower or Common sunflower, introduced to the UK. It reaches 2 m tall and 50 cm across in about 10 years. It grows in full sun, on loam, clay or sand soil, where the ground is neutral or alkaline and in well drained conditions, and suits average positions. It flowers from July to September. Its RHS hardiness rating is H3 (half hardy): −5 to 1°C.
Assembled from the attributes recorded below.
What this plant needs
- Size at maturity
- 2 m tall × 50 cm across, after about 10 years
- Hardiness
- H3 (RHS)
- Lifecycle
- Annual
- Aspect
- Full sun
- Soil
- Loam, Clay, Sand
- Acidity
- Neutral, Alkaline
- Moisture
- Well drained
- Exposure
- Average
- In the UK
- Introduced
When it flowers
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
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