bulb corm tuber

Giant Allium

Allium giganteum

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

48 inches

Width

24 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Central Asia

Toxicity

Toxic to pets if ingested

The Story

Plant Bio

Tall, impressive flowering onion with large globe-shaped heads. Known for its stunning height and structural presence in garden designs.

Bloom Period:

EarlyLate

Uses & Benefits:

Impressive tall flower stalks create striking vertical accents in gardens, attracting admiration from visitors.

Bulbs are low-maintenance and naturalize over time, reducing planting effort.

Provides nectar for pollinators like bees and butterflies during flowering season.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck bulbs 4-6 inches deep in well-draining soil in early fall.
Water thoroughly after planting to settle soil around bulbs.
Mist foliage regularly during growing season for lush growth.
Support tall flower stalks to prevent toppling as they mature.
Fertilize with balanced bulb food in early spring for vigorous blooms.
Remove seed heads after flowering to encourage bulb energy storage.

Pro Tip

Plant in a sunny spot with good drainage for best results.

Keep It Thriving

Care Guide

Do

Water regularly during active growth 🌱
Provide full sun for optimal flowering
Apply balanced fertilizer in spring
Support tall flower stems with stakes

Don't

Avoid waterlogging soil ❌
Don't disturb bulbs once planted
Refrain from over-fertilizing late in the season
Avoid pruning after flowering

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Harvest
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Tall floral accent in bordersDramatic focal point in perennial bedsVertical element in cottage gardens

Companion Plants

Rosemary Lavender Salvia Echinacea Sedum

Multiply

Propagation Methods

Good to Know

Common Questions

Giant Allium questions

What zones can Giant Allium grow in?

Giant Allium is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Giant Allium deer resistant?

Yes — Giant Allium is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Giant Allium bloom?

Giant Allium typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Giant Allium need full sun?

Giant Allium does best in full sun (6+ hours).

Is Giant Allium drought tolerant?

Yes — once established (usually after the first full season), Giant Allium handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.