annual

Garden Cosmos

Cosmos bipinnatus

Not currently listed at our partner nurseries.

Expertly Curated

Real-Time Pricing

Loved by Designers

Essentials

At a Glance

Plant Type

Annual

Height

48 inches

Width

24 inches

Light

Full Sun, Partial Sun

Water

Moderate

Humidity

Average

Lifespan

Annual

Native To

Mexico

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Cosmos bipinnatus, commonly known as garden cosmos, is an annual plant known for its bright, daisy-like flowers and ferny foliage. It thrives in sunny conditions and poor soils. This species is notable for its ability to self-sow, resulting in new plants the following year without the need for replanting.

Bloom Period:

EarlyLate

Uses & Benefits:

Cosmos bipinnatus provides vibrant, daisy-like flowers that attract pollinators and brighten garden borders with minimal maintenance.

Its cut flowers last long in arrangements, making it ideal for floral displays.

Supports bees and butterflies, contributing to pollinator health.

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 seeds 1/4 inch deep into well-draining soil in full sun.
Keep soil moist until seedlings emerge, about 7-10 days.
Thin seedlings to 12-18 inches apart to promote airflow.
Water regularly during dry spells, avoiding overwatering.
Fertilize monthly with a balanced fertilizer for continuous blooms.
Deadhead spent flowers to encourage new growth.

Pro Tip

Sow seeds directly outdoors after the last frost for best results.

Keep It Thriving

Care Guide

Do

Water deeply once a week during dry periods 🌱
Pinch back young plants to promote bushier growth
Remove dead or diseased foliage promptly

Don't

Avoid overwatering to prevent root rot ❌
Don’t fertilize late in the season to avoid legginess
Never leave plants in crowded conditions

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright flower borderAiry cut flower bouquetWildflower meadow edge

Companion Plants

Marigold Zinnia Sunflower Cosmos bipinnatus Nicotiana

Multiply

Propagation Methods

Good to Know

Common Questions

Garden Cosmos questions

What zones can Garden Cosmos grow in?

Garden Cosmos is hardy in USDA Zone 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Garden Cosmos deer resistant?

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

When does Garden Cosmos bloom?

Garden Cosmos typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Garden Cosmos need full sun?

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

Is Garden Cosmos drought tolerant?

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