Answer: Cosmos grows tall very quickly once it germinates and so is a bit tough for the home gardener to grow well by starting it indoors. (If you insist on trying, allow only about 4 weeks or so and provide it plenty of light.) For this reason, it is usually grown from seed planted directly in the garden or from purchased transplants. Cosmos needs full sun and a warm soil and enjoys warm weather, so plant it after all danger of frost. Some of the older varieties may not begin blooming until mid summer, but nonetheless it is a wonderful annual. It makes a great display in the garden and also does well as a cut flower. In fact, the more you cut it the more it seems to bloom. Enjoy your cosmos!
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