Sea Shells Mix

Cosmos

60d to harvest

Feathery, seashell-swirled blooms rise like confetti on airy stems, opening into luminous, daisy-like faces that shimmer in the sun. The petals are satisfyingly crisp and lightly ruffled, holding their shape with a graceful, wind-kissed texture—ideal for bouquets that look fresh and abundant from the first day. Sea Shells Mix is a pollinator favorite with a vivid, mixed palette, perfect for gardeners who want a long season of color and movement in the flower bed.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 20th
Transplant / Sow Outdoors	Apr 20th
Harvest Begins	Jun 19th
Harvest Ends	Oct 20th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	55
Min Night Temp (°F)	45
Harden Off (days)	Not Required

Recommended Companions

Inca II Marigold

Zinderella Peach Zinnia

Frequently Asked Questions

How often should I water Cosmos bipinnatus during the main growing phase?

During active growth, water deeply when the top 1 inch of soil feels dry, then let excess water drain—cosmos dislikes staying soggy. Aim for roughly 1 inch of water per week total (from rainfall plus irrigation) during typical conditions, increasing slightly during hot spells and reducing in cool, wet weather. Consistent moisture supports steady flowering, but overwatering encourages mildew.

How can I tell when Cosmos bipinnatus is ready to harvest?

Harvest for cut flowers when the blooms are fully open and the petals are crisp, not limp; new buds should continue forming for about 60 days after sowing. If harvesting for seed, let the flower heads dry on the plant until the seeds are brown and firm, then cut and finish drying indoors before storing. Deadheading spent flowers regularly will keep cosmos flowering longer.