annual

Sulphur Cosmos

Cosmos sulphureus 'Bright Lights'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Annual

Height

30 inches

Width

15 inches

Light

Full Sun

Water

Low

Humidity

Average

Lifespan

Annual

Native To

Mexico

Toxicity

Non-toxic

The Story

Plant Bio

An annual native to Mexico with finely-divided, fern-like foliage and daisy-like flowers. Thrives in heat and tolerates poor, dry soils, often self-seeding. An All-America Selections winner (1966), 'Bright Lights' is a popular mix featuring semi-double flowers in vibrant shades of yellow, gold, orange, and scarlet. It is prized for its long bloom period from summer to frost and its easy-going nature.

Uses & Benefits:

Cosmos sulphureus Bright Lights adds vibrant color and attracts pollinators, making it perfect for lively garden borders and wildflower meadows.

Its drought tolerance reduces water needs, ideal for sustainable gardening.

Provides nectar for bees, butterflies, and hummingbirds, supporting local ecosystems.

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 just below soil surface in early spring for best germination.
Water regularly to keep soil moist but not waterlogged during germination.
Thin seedlings to 12 inches apart once established for optimal growth.
Mist cuttings with water to encourage root development in summer.
Transplant seedlings after the last frost for a stronger start.
Fertilize monthly with a balanced 10-10-10 fertilizer during the growing season.

Pro Tip

Plant in full sun with well-draining soil for vibrant blooms and healthy growth.

Keep It Thriving

Care Guide

Do

Water deeply once a week during dry spells 🌱
Deadhead spent flowers to promote continuous blooming
Apply a balanced fertilizer monthly during the growing season

Don't

Avoid overwatering which can lead to root rot ❌
Do not overcrowd plants to prevent disease
Refrain from using heavy mulch that retains excess moisture

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright, cheerful border plantWildflower meadow accentVivid container display

Companion Plants

Marigolds Zinnias Coreopsis Cosmos bipinnatus Sunflowers

Multiply

Propagation Methods

Good to Know

Common Questions

Sulphur Cosmos questions

What zones can Sulphur Cosmos grow in?

Sulphur 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 Sulphur Cosmos deer resistant?

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

When does Sulphur Cosmos bloom?

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

Does Sulphur Cosmos need full sun?

Sulphur Cosmos does best in full sun (6+ hours).

Is Sulphur Cosmos drought tolerant?

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