bulb corm tuber

Onion

Allium cepa

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, 9

Water

Moderate

Humidity

Average

Lifespan

Biennial, grown as an annual

Native To

Central Asia

Toxicity

Toxic to dogs, cats, and many other animals

The Story

Plant Bio

Onions are biennial plants typically grown as annuals for their edible bulbs and greens. Allium cepa is valued for culinary uses and has numerous cultivars with varying taste and color.

Bloom Period:

EarlyLate

Uses & Benefits:

Alliums add striking spherical blooms and fragrance to gardens, attracting pollinators.

Edible bulbs are used in culinary dishes worldwide, providing flavor and nutrition.

Supports bees, butterflies, and beneficial insects, enhancing garden biodiversity.

Marketplace

Where to Buy

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

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Planting

How to Grow

Tuck onion sets or seedlings into well-drained soil in early spring.
Water consistently to keep soil moist but not waterlogged.
Fertilize with a balanced fertilizer every 4-6 weeks during active growth.
Thin out overcrowded plants to improve air circulation and bulb development.
Mulch around plants to retain moisture and suppress weeds.
Harvest when the tops begin to yellow and fall over, typically mid to late summer.

Pro Tip

Plant in full sun with rich, well-drained soil for best bulb development.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Apply balanced fertilizer every 4-6 weeks
Ensure good air circulation around plants
Mulch to retain moisture

Don't

Overwater to avoid bulb rot ❌
Plant in heavy clay soils without proper drainage ❌
Forget to weed regularly
Overcrowd bulbs, which can lead to disease

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

Scented borderEdible garden bedFoliage accent

Companion Plants

Carrots Cucumbers Tomatoes Lettuce Beets

Multiply

Propagation Methods

Good to Know

Common Questions

Onion questions

What zones can Onion grow in?

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

Is Onion deer resistant?

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

When does Onion bloom?

Onion 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 Onion need full sun?

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