Sow seeds in spring and summer. The flowers look like daisies with yellow centers. How to use. They grow from 2 to 8 feet high, and the plants are informal- looking with open branches. Plant in full sun.
Cosmos are drought resistant and readily reseed themselves as the plants die down in fall.
These perennials start from seed but produce tuberous roots that are nearly impossible to kill once they are established. Sow seeds in early spring for blooms in summer and fall. The tiny trumpet-shaped flowers close up in late afternoon, hence their name four o'clocks. They reseed so easily that they may become invasive. How to use.