bulb corm tuber

Canada Onion

Allium canadense 'White Flag'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

24 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Toxic to dogs and cats

The Story

Plant Bio

Allium canadense, known as White Flag, is a perennial herb with slender, grass-like foliage and clusters of star-shaped white flowers that bloom in umbels during late spring to early summer. This cultivar is distinguished by its pure white flower umbels, which create a striking contrast against its fine, linear foliage, making it an attractive addition to ornamental and naturalized plantings.

Bloom Period:

EarlyLate

Uses & Benefits:

Elegant white flowers add visual interest in late spring, attracting pollinators and enhancing garden aesthetics.

Provides reliable perennial blooms with minimal maintenance.

Supports bees and other pollinators, contributing to local biodiversity.

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.
Water regularly during active growth period.
Mulch to retain moisture and suppress weeds.
Divide clumps every 3-4 years in early fall.
Plant in full sun for best flowering.
Allow foliage to die back naturally after blooming.

Pro Tip

Plant in well-drained soil and full sun for optimal growth.

Keep It Thriving

Care Guide

Do

Water during dry periods 🌱
Allow foliage to die back naturally
Divide in early fall

Don't

Overwater to prevent bulb rot ❌
Plant too deep ❌
Neglect soil drainage ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

White‑flowered borderPollinator-friendly garden

Companion Plants

Echinacea Sedum Coreopsis Rudbeckia

Multiply

Propagation Methods

Good to Know

Common Questions

Canada Onion questions

What zones can Canada Onion grow in?

Canada Onion is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Canada Onion deer resistant?

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

When does Canada Onion bloom?

Canada Onion typically blooms in late spring through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Canada Onion need full sun?

Canada Onion does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Canada Onion drought tolerant?

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