species
Allium sphaerocephalon
Ball-head onion · Bristol onion · Drumstick allium · Round-headed garlic
Photo: Raimundo Pastor · CC BY-SA 4.0 · via Wikimedia Commons
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Allium sphaerocephalon belongs to the family Amaryllidaceae, also known as Ball-head onion, Bristol onion, Drumstick allium or Round-headed garlic, native to the UK. It reaches 1 m tall and 50 m across in about 3 years. It grows in full sun, where the ground is neutral or alkaline and in dry or well drained conditions. It flowers from May to June. Its RHS hardiness rating is H6 (hardy, very cold winter): −20 to −15°C.
Assembled from the attributes recorded below.
What this plant needs
- Size at maturity
- 1 m tall × 50 m across, after about 3 years
- Hardiness
- H6 (RHS)
- Aspect
- Full sun
- Acidity
- Neutral, Alkaline
- Moisture
- Dry, Well drained
- In the UK
- Native
When it flowers
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
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