Cosmos bipinnatus. Lovely, delicate Cosmos in a range of pinks and off-whites that only grows to 90cm (36") tall in full sun. This is a shorter version of the Sensation Mix, but not technically a dwarf variety. Mini Blend Cosmos seeds produce flowers that are attractive to hummingbirds, butterflies and wild pollinators. This blend looks fantastic on its own as a short growing meadow flower, and it is quite drought tolerant, so it's useful in xeriscaping. They're also pretty enough for gathering as cut flowers. Direct sow Cosmos seeds from April to early June and keep the mature plants deadheaded to prolong the blooming season until first frost.
Cosmos will flower more in poor soil, rather than rich, so avoid manures and fertilizers. Pinch out the growing point when plants are around 45cm (18″) tall to encourage bushier growth and more flowering points. Water during very dry spells, but otherwise, Cosmos is well suited to xeriscaping. Seeds are easy to harvest and save.
These annual plants that are sometimes referred to as Cosmea.
Cosmos bipinnatus & C. sulfureus
Season & Zone
Exposure: Full sun
Direct sow from early March right up until mid-June. Several sowings will result in a very long bloom period. You can also start Cosmos indoors in February to early March for transplanting late March to mid-April. Seeds will sprout in 3-10 days. Optimal temperature for germination: 21-25°C (70-75°F).
Sow seeds very shallowly only a few millimeters (1/8″) deep. Thin or transplant to 20-25cm (8-10″) apart.