Cosmos ’Rosetta’

Cosmos bipinnatus

Features

  • Cut-and-come-again
  • Easy to grow
  • Heat-loving
  • Pollinator-friendly

Description

This variety is a must-have for arranging and wedding work, and flowers are stunning arranged en masse. Blooms have a layer of half-double petals that resemble fluffy petticoats. ‘Rosetta’ is a mix of soft pink, blush, and rose with each petal appearing as if it was hand painted. Cosmos are one of the easiest cut flowers you can grow and are perfect for beginners.

Details

Plant type: annual
Height: 36 to 42 in
Site: full sun
Days to maturity: 75 to 90 days
Plant spacing: 12 in
Pinch: when 8 to 12 in tall

Seed Sowing & Growing Notes

Start seed indoors in trays 4 to 6 weeks before last frost; transplant out after all danger of frost has passed. Cosmos can also be direct-seeded once the weather has warmed.

Harvesting/Vase Life

Harvest when buds are just cracking, but haven’t fully opened. For double varieties, let open halfway before picking. Expect a vase life of 5 to 6 days.

Details

Description

This variety is a must-have for arranging and wedding work, and flowers are stunning arranged en masse. Blooms have a layer of half-double petals that resemble fluffy petticoats. ‘Rosetta’ is a mix of soft pink, blush, and rose with each petal appearing as if it was hand painted. Cosmos are one of the easiest cut flowers you can grow and are perfect for beginners.

Details

Plant type: annual
Height: 36 to 42 in
Site: full sun
Days to maturity: 75 to 90 days
Plant spacing: 12 in
Pinch: when 8 to 12 in tall

Seed Sowing & Growing Notes

Start seed indoors in trays 4 to 6 weeks before last frost; transplant out after all danger of frost has passed. Cosmos can also be direct-seeded once the weather has warmed.

Harvesting/Vase Life

Harvest when buds are just cracking, but haven’t fully opened. For double varieties, let open halfway before picking. Expect a vase life of 5 to 6 days.

Sources

How to Grow

Winter Mini Course

Learn how to start flowers from seed in this three-part video series

In our upcoming Winter Mini Course, you’ll learn everything you need to know to successfully start flowers from seed, including all of the necessary supplies, step-by-step instructions, special tips and tricks, and how to create a simple indoor seed-starting area.