Cosmos bipinnatus Rosetta flower seeds
Very airy and free-flowering variety called Rosetta flowers abundantly on long stems. The plants do need some support but are definitely worth it! The flowers are quite large and easy for pollinators to visit. The soft pink tones and the yellow center dance high above the plants’ foliage.
Planting information to grow cosmos Rosetta from seed:
Plant type: annual
Height: 75 centimeters
Position: full sun or partial sun
Start: 3/4 weeks before the last frost date
Number of days until plants bloom: 90-100 days
Distance between the plants: 30 to 40 centimeters
Pinching: when young plants are about 30 centimeters high
Number of seeds per pack: 50
Sow cosmos indoors in a windowsill or in the greenhouse in early spring, 3 to 4 weeks before transplanting outside. The seed can also be sown directly in mid to late spring. During germination, keep the soil moderately moist. Use good compost or fine sowing soil and cover to a depth of 3mm. Plants grow quickly so it is best to sow them in the 40 cell tray or larger. Plant them out after the frost has passed. Cosmos plants grow quite large, give them space and keep at least 40 centimeters of planting distance. We keep about 2 plants on a 75-centimeter wide bed.
30 – 40 cm
|Days to mature||
90 – 100 days
Full sun or partial sun