Cosmos ’Rosetta’
Cosmos bipinnatus
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
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
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
Sources
How to Grow
Summer Mini Course
Learn how to grow, harvest & arrange beautiful cut flowers
In our upcoming three-part video series, you’ll learn a simple step to double the number of blooms your plants produce, how to cut and care for your flowers for the longest vase life, and how to make mixed bouquets quickly and efficiently.
