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Blue Cosmos Seeds for Planting

Blue Cosmos Seeds for Planting

$16.99 USD
$16.99 USD
Sale Sold out

How to Sow and Plant

Sow seeds directly outdoors after the last frost, or start indoors 4–6 weeks earlier.
Cover seeds lightly — cosmos need some light to germinate (surface or very shallow cover).
Keep soil moist until seedlings emerge. Thin/space to 12–18 in apart when established.

How to Grow

Position in full sun for best colour and flower density.
Use well-draining, average garden soil.
Water moderately; plants are heat/drought tolerant once established.
Deadhead spent flowers to prolong blooming.

Tips

Start indoors for an earlier display; thin seedlings to avoid crowding.
Support very tall varieties if you want cut stems — otherwise they naturalize as airy borders.

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About
Product Information
Features
life-cycle

LIFE CYCLE

Annual

plant-characteristics

PLANT CHARACTERISTICS

Delicate

growth-habit

GROWTH HABIT

Upright

bloom-season

BLOOM SEASON

Summer to early fall

flavour-profile

FLAVOUR PROFILE

Ornamental

suitable-for

SUITABLE FOR

Outdoor

About
Blue Cosmos Seeds for Planting
seed-type

SEED TYPE

Non-GMO

plant-type

PLANT TYPE

Annual flower

Blue Cosmos (Cosmos bipinnatus) is prized for its tall, graceful stems, airy foliage and abundant blue daisy-like flowers that attract butterflies. It’s an easy, reliable annual for cottage beds, borders and pollinator-friendly plantings.

Planting information
planting-season

PLANTING SEASON

Spring

fruit-size

FRUIT SIZE

N/A

plant-height

PLANT HEIGHT

24–48 in

light-requirement

LIGHT REQUIREMENT

Full Sun

water-needs

WATER NEEDS

Moderate

hardiness-zones

HARDINESS ZONES

Annual

container-garden

CONTAINER GARDEN

Yes

plant-spacing

PLANT SPACING

12–18 in

planting-depth

PLANTING DEPTH

Surface

growing-conditions

GROWING CONDITIONS

Well-drained soil

Coverage
Seed Count
Recommended Coverage
SEED COUNT
100
GTIN
036000173178

Frequently Asked Questions

Can Blue Cosmos reseed itself in the garden?

Cosmos can drop mature seed and may return from self-sown seedlings in suitable conditions. Removing spent flowers before seed formation can reduce unwanted reseeding.

Are Cosmos flowers suitable for cutting arrangements?

Yes. The upright stems and daisy-like flower heads make Cosmos useful as a cut flower. Harvesting stems when flowers are freshly opening can help with vase display.

Does Cosmos tolerate windy garden locations?

Tall, airy Cosmos can move in strong wind. In exposed sites, placing plants near a support or among sturdier plantings can help reduce stem bending.

Can Cosmos be succession-sown for a longer display?

Yes. Sowing small batches at intervals during the suitable growing season can help stagger flowering rather than relying on one planting.

What does Cosmos foliage look like before flowering?

The foliage is finely divided and feathery, giving the plant a light, airy appearance even before the daisy-like flowers open.

Will Cosmos continue flowering after individual blooms fade?

Plants can produce additional flowers over the season when spent blooms are removed regularly, encouraging the plant to keep producing fresh flower heads.