Plant Finder Features How It Works Pricing Testimonials Blog

The UK's leading eCommerce platform for horticulture businesses.

Product

Features
How It Works
Pricing

Company

About
Blog
Contact

Legal

Twitter LinkedIn

giant onion | Plant Finder | Fill My Garden

Home/Plants/Bulbs

Plants > Bulbs

giant onion

Allium giganteum

Pollinator FriendlyFragrant

Genus: Allium
Family: Amaryllidaceae
Common Names: giant allium

About this plant

A perennial with spreading, glossy, strap-shaped basal leaves which die down before the flowers. Dense globose umbels of bright purple flowers are borne on tall stems in summer

Growing Information

Height

1-1.5 Metres

Spread

0.1-0.5 Metres

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 FacingNorth FacingSouth FacingEast 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 in containers in a cold frame when just ripe or in the spring. Alternatively, remove offsets in autumn

Pests

Generally pest free

Diseases

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

Garden Uses

Uses

Ground Cover

Planting Places

IndoorOutdoor

Season of Interest

SpringSummer

Size & Characteristics

Height

1-1.5 Metres

Spread

0.1-0.5 Metres

Habit

Climbing

Time to Full Height

Five To Ten Years