How the Seasonal Color Calendar Works
It is surprising how often you need to replace seasonal color displays. Once a year is not enough. The schedule landscape professionals use for temporary floral displays follows the calendar in a unique way. Plants labeled as annuals do not last a full year, but they can stretch through more than one season. Seasonal color typically needs refreshing at least three times a year.
One way to stretch the effectiveness of a floral display is to replace beds just as one set of annual flowers end their peak flowering period, using cool-season annuals in winter and warm-season annuals in spring and summer, but there are no annual flowers that perform a full six months of the year. Popular annuals have a long bloom period or provide extended color through striking foliage hues, but even with excellent plant choices, there are gaps with a semiannual bed switch.
An annual isn’t called an annual because you plant it once a year. It is called an annual because, if left to its own devices, it will complete a full life cycle sometime within one year. A seed can grow into a full-sized plant, flower, and then go back to seed and die long before twelve months go by. The process often takes only a few months. Corn seeds can be planted, grow to over six feet tall, produce ears, and die in just a few weeks! Annuals can sometimes re-seed in place and repeat the cycle of germination, growth, and seed production, appearing to act as perennials. Most often annuals depend on gardeners to continue the process.