annual

Cornflower

Centaurea cyanus

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Annual

Height

24 inches

Width

12 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Annual

Native To

Europe

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Annual plant known for its striking blue flowers. Often used as a cut flower and has a long blooming season.

Bloom Period:

EarlyLate

Uses & Benefits:

Vivid blue flowers attract pollinators and add color to sunny borders.

Drought-tolerant once established, suitable for xeriscaping.

Supports bees and butterflies, 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 seeds just beneath soil surface in early spring.
Mist cuttings lightly to maintain moisture during rooting.
Ensure well-drained soil with full sun exposure for optimal growth.
Mulch around plants to conserve moisture and suppress weeds.
Fertilize with a balanced, water-soluble fertilizer every 4 weeks.
Divide clumps every 2-3 years in early spring for rejuvenation.

Pro Tip

Use seed-starting trays for early germination and transplant seedlings after two sets of true leaves.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist but not waterlogged 🌱
Prune dead or damaged stems to encourage bushier growth
Apply a balanced fertilizer monthly during active growing season

Don't

Avoid overwatering to prevent root rot ❌
Do not fertilize late in the season to prevent weak growth
Refrain from overcrowding to ensure good air circulation

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Harvest
Plant

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower meadow with vibrant blue bloomsBright border for sunny garden beds

Companion Plants

Coreopsis Black-eyed Susan Lavender Salvia Echinacea

Multiply

Propagation Methods

Good to Know

Common Questions

Cornflower questions

What zones can Cornflower grow in?

Cornflower 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 Cornflower deer resistant?

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

When does Cornflower bloom?

Cornflower 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 Cornflower need full sun?

Cornflower does best in full sun (6+ hours).

Is Cornflower drought tolerant?

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