bulb corm tuber

Red Onion

Allium cepa 'Deep Purple'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

24 inches

Width

6 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Biennial grown as an annual

Native To

Central Asia

Toxicity

Toxic to pets if ingested

The Story

Plant Bio

This cultivar produces striking, deep purple bulbs that are flavorful and can be used in various culinary preparations. Notable for its vibrant color and robust flavor, making it a favorite for home gardens and markets.

Bloom Period:

EarlyLate

Uses & Benefits:

Alliums add striking architectural form and vibrant color to gardens, attracting pollinators.

Their strong scent deters pests and keeps nearby vegetable gardens safe.

Supports pollinator populations, especially bees and butterflies.

Marketplace

Where to Buy

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

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Tuck bulbs 2 inches deep in well-draining soil in fall.
Water thoroughly after planting to settle soil.
Allow foliage to yellow before removing for energy storage.
Divide clumps every 3-4 years in early spring or fall.
Mulch to conserve moisture and suppress weeds.
Fertilize with a balanced fertilizer in early spring.

Pro Tip

Plant in full sun for best flower production and bulb growth.

Keep It Thriving

Care Guide

Do

Water regularly during active growth 🌱
Apply balanced fertilizer annually
Provide full sun exposure

Don't

Overwater to prevent bulb rot ❌
Plant too shallow or too deep
Neglect to mulch in winter

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Clove-scented borderVertical accent in herb garden

Companion Plants

Carrots Lettuce Tomatoes

Multiply

Propagation Methods

Good to Know

Common Questions

Red Onion questions

What zones can Red Onion grow in?

Red Onion is hardy in USDA Zones 4, 5, 6, 7, 8, 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Red Onion deer resistant?

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

When does Red Onion bloom?

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

Does Red Onion need full sun?

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

Is Red Onion drought tolerant?

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