Plant indoors four to six weeks before your region s average last frost date to get earliest bloom. Trim spent blooms to encourage a longer bloom period. Pull out plants, and discard in fall once frost kills them. Cosmos require moderate to little water. Plant cosmos in groups of at least a dozen to take advantage of their wildflower-like effect.
Cosmos don t thrive in overly rich soil.
They ll produce lots of tall foliage but fewer flowers. Inc. How things get done. Use of this Web site constitutes acceptance of the eHow Terms of Use and Privacy .