Flower Cosmos Seeds

9 products

Bring airy color and graceful blooms to your garden with cosmos seeds from David's Garden Seeds®. Explore flower forms ranging from classic single blooms to fuller doubles and distinctive tubular petals. Choose individual varieties for their colors, mature heights and flower shapes to create a display that suits your space.

Why Grow Cosmos?

A choice of flower forms: Single flowers offer an open, daisy-like look, while double blooms add fullness and tubular petals bring extra dimension. Check each listing for its specific form.
Airy garden texture: Slender stems and delicate foliage give cosmos a relaxed appearance in cottage gardens and mixed borders.
Flowers for bouquets: Cosmos add a light, informal touch to fresh arrangements. Compare stem length and mature height when choosing varieties for cutting.
Flexible garden planning: Select varieties suited to your available space rather than assuming every cosmos grows to the same height.

Tips for Growing Cosmos

Choose a sunny site with well-drained soil. Follow the individual variety's directions for sowing depth, planting time and spacing, and wait until frost danger has passed before planting tender seedlings outdoors.

Keep the seedbed moist during germination and water young plants as needed while they establish. Avoid excessive fertilizing, which can encourage leafy growth instead of flowers. Taller varieties may benefit from support in windy or exposed locations.

Remove spent blooms to help encourage continued flowering, or leave some seed heads to mature if you want to encourage self-sowing. For bouquets, cut with clean tools and place stems in clean water promptly. Flowering time and duration depend on the variety and growing conditions.