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Cosmos Asteraceae
FLOWER-COSMOS-SEA SHELLS This tall, bushy cosmos is mostly noted for its unique flower form. They produce lovely, tubular-petalled blooms somewhat similar to a seashell in lovely pastel colors of white, pink & rose which are borne above the feathery foliage. These delicate, colorful flowers make an outstanding background planting that blooms all summer long. Cosmos are easy to grow & literally thrive on neglect! Grows to a height of 90cm & a spread of 63cm. Even though this is a half-hardy annual (meaning they will only last one year), if left go to seed, they will naturalize & become a year after year joy to your garden.

Cosmos is one of the easiest plants to grow. When you are ready to sow the seeds, you can either sprinkle the seed in shallow rows or simply scatter them randomly.


Germination Time (Days) 7 – 21
Flowering Time (Days) 80 – 100
Sowing Depth (mm) 10 – 15
Plant Spacing (cm) 50
pH 6 – 7
Soil Temperature (°C)
Hardy / Frost Tender Half Hardy
Sow Direct / Raise Seedlings

Sow Direct / Raise Seedlings

Seed Preparation