Cosmos are at their best in autumn. Space plants 10 to 12 inches apart. Over fertilization produces lots of foliage but few blooms. Some shelter from the wind is suggested. The flowers are good for cutting.
Some varieties come true from saved seed.
The seed germinates in five to seven days at 68 to 86 degrees. The seed can be planted directly into the garden after the danger of frost has passed. Visuals associated with this text. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.