Overview
Allium unifolium is a plant with a clump-forming habit in the genus Allium, part of the Amaryllidaceae family, with deciduous foliage. Allium unifolium grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H6. Suggested uses include borders, cut flowers, dried flowers and architectural planting.
About
Allium unifolium, the one-leaf onion or American garlic, is a North American species of wild onion. It is native to the coastal mountain ranges of California, Oregon, and Baja California.
Wikipedia contributors, CC BY-SA 4.0 — Allium unifolium
About the genus
Allium is a large genus of monocotyledonous flowering plants with 1112 accepted species, making Allium the largest genus in the family Amaryllidaceae and among the largest plant genera in the world. Many of the species are edible, and some have a long history of cultivation and human consumption such as the onion, garlic, scallions, shallots, leeks, and chives.
Wikipedia contributors, "Allium", CC BY-SA 4.0 — Allium
Growing conditions
Best soil and position for Allium
- Sunlight
- Full sun
- Soil type
- Loam, Sand, Chalk
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Well-drained
- Aspect
- South-facing, East-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H6
Plant details
Allium unifolium size, habit and characteristics
- Habit
- Clump-forming
- Foliage
- Deciduous
- Suggested uses
- Borders, Cut flowers, Dried flowers, Architectural planting
Care notes
Pruning and caring for Allium unifolium
- Propagation
- Offsets, Seed
- Pest resistance
- Allium leaf miner, Onion fly
- Disease resistance
- Onion white rot, Onion downy mildew, Leek rust
Frequently asked questions
Where is the best place to plant Allium unifolium?
Allium unifolium prefers full sun. It suits sheltered positions.
What soil does Allium unifolium need?
Allium unifolium is adaptable and grows happily in most soil types, including loam, sand and chalk. It is happy in soil of any pH. Aim for soil that stays well-drained.
Is Allium unifolium hardy in the UK?
Allium unifolium has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.
How do I propagate Allium unifolium?
Offsets, Seed.
More in the Allium genus
- Allium 'Judith'
- Allium 'Summer Beauty'
- Allium cepa 'Goldito'
- Allium christophii (albopilosum)Star of Persia
- Allium hookeri 'Zorami'Hooker Chives
- Allium phanerantherumconspicuous-anthered garlic
- Allium 'Millenium'
- Allium schmitzii