For beautiful and prolific blooms from summer to frost, plant Cosmos bipinnatus in a location with full sun and well-draining, moderately fertile soil. Seeds can be started indoors 4 to 6 weeks before the last frost to get a head start or sown directly in the garden after all danger of frost has passed.

When sowing directly, rake the seeds gently into the top layer of soil, as they require light to germinate and should be no more than 1/4 inch deep. Space taller varieties about 1 to 2 feet apart, and shorter types 10 to 12 inches apart, as closer spacing helps taller plants support each other.

After germination, keep seedlings consistently moist, but established plants are drought-tolerant and prefer drier conditions, so be careful not to overwater.

For more planting instructions visit our Gardening Guides

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If you've followed our detailed planting and care instructions and you don't experience success, we will honor our satisfaction guarantee for up to one full year from delivery. We are happy to offer a replacement, an account credit or a refund. Your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 5 days.

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Thank you and good planting!