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American onion | Plant Finder | Fill My Garden

Home/Plants/Bulbs

Plants > Bulbs

American onion

Allium unifolium

★ RHS AGMPollinator FriendlyFragrant

Genus: Allium
Family: Amaryllidaceae

About this plant

A compact perennial to 30cm in height, with short grey-green basal leaves and umbels of relatively large, star-shaped rose-pink flowers in late spring

Growing Information

Height

0.1-0.5 Metres

Spread

0-0.1 Metre

Hardiness

Foliage

Deciduous

Growing Conditions

Sunlight

Full Sun

Soil

ClayChalkLoamSandy

AcidAlkaline

Not Currently Available

This plant is not currently stocked at any garden centres on our platform.

Neutral

Moisture

Poorly DrainedWell Drained

Aspect

West FacingEast FacingSouth FacingNorth Facing

Exposure

Exposed

Care Guide

Cultivation

Easy to grow in fertile well-drained soil. Add grit when grown in clay soils to improve drainage. See allium cultivation for further advice

Pruning

No pruning required

Propagation

Propagate by seed, sowing seeds in containers with bottom heat when ripe and grow on under glass. Remove offsets in spring and grow on under glass for 2 seasons

Pests

Generally pest free

Diseases

Generally trouble-free: Onion white rot and a downy mildew may occur

Garden Uses

Uses

Hedging ScreensWall Side Borders

Planting Places

Outdoor

Season of Interest

SpringSummer

Size & Characteristics

Height

0.1-0.5 Metres

Spread

0-0.1 Metre

Habit

Climbing

Time to Full Height

Five To Ten Years