Since most annuals have small root systems, they are easy to transplant and can be planted over spring-flowering bulbs. They can tumble down walls and soften sharp edges. Selections for these uses are described as cascading. Their growing habit causes them to trail over the edge of their growing space. See Fact Sheet 1203 for suggested annuals for containers, Reference Herbac.5.
Some annuals produce fast, upward growth.
Fast-growing annual vines can produce privacy screening or cover unsightly walls in just weeks. Annuals suitable for screening or covering include cathedral bells, hyacinth bean, moonflower, morning glory, scarlet runner bean and vining nasturtium. Some annuals are grown for drying and used in arrangements and wreaths. Popular everlasting annuals include celosias, amaranthus, strawflowers, Gomphrena globosa and zinnias. Some annuals must be started indoors during late winter or they will not have enough time to reach maturity.