Cosmos ‘Purity’

Cosmos bipinnatus

Features

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

Description

If you want a perfect pure white, single-flowered variety, then look no further. This cheerful daisy-like bloomer is an excellent choice. Of all the annual plants you can grow in your cutting garden, few are more productive per square foot than cosmos. The more you cut, the more they bloom.

Details

Plant type: annual
Height: 42 to 48 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

If you want a perfect pure white, single-flowered variety, then look no further. This cheerful daisy-like bloomer is an excellent choice. Of all the annual plants you can grow in your cutting garden, few are more productive per square foot than cosmos. The more you cut, the more they bloom.

Details

Plant type: annual
Height: 42 to 48 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

Seed-Saving Mini Course

Learn how to save seed from zinnia, dahlia, and celosia

In our upcoming free, three-part video series, you’ll learn everything you need to know to save seeds on a home scale, including how plants are pollinated and isolation techniques to ensure varieties come back true, how to tell when plants are ready to pick and how to harvest the seeds, and how to properly dry, clean, and store seeds long term.