West Coast Seeds
West Coast Seeds (Purity)
West Coast Seeds (Purity)
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Cosmos bipinnatus. Purity cosmos seeds yield single snow-white flowers to lighten the dark areas of a cottage garden. Regular dead heading will encourage continuous flowering from summer into late autumn. The ferny foliage on this variety is graced by the flowers up to 10cm (4") in diameter on plants that grow to about 76cm (30") tall. Stake this variety if growing in exposed areas, or use Green Garden Netting to keep plants upright. When they are just two feet tall, let their tips grow through a layer of netting lain flat over the bed. This will give them all the support they need.
| Latin Name |
Cosmos bipinnatus & C. sulfureus |
| Difficulty |
Very easy |
| Exposure | Full sun |
| Timing |
Direct sow after the last frost date. Several sowings will result in a very long bloom period. Cosmos can also be started indoors in late winter for transplanting after last frost, once daytime temperatures are above 10°C (50°F). Seeds will sprout in 3-10 days. Optimal temperature for germination: 21-25°C (70-75°F). |
| Starting |
Sow seeds very shallowly only a few millimetres (1/8″) deep. Thin or transplant to 20-25cm (8-10″) apart. |
| Growing |
Most varieties can get quite tall, and in exposed or windy gardens can benefit from staking or trellis netting laid horizontally over the bed for the stems to grow through before blooming. Deadhead and cut for bouquets regularly to extend the bloom period. |
