Choose plants adapted to the light levels in your garden. Planning for Continuous Bloom Most perennial plants have a distinct bloom period, lasting anywhere from a week to a month or more. A few will describe certain plants as continuous bloomers, but even these usually have a period of peak bloom. When planning your garden, consider bloom times carefully. If you mistakenly choose all early summer bloomers, you may be disappointed when there's only foliage in your garden from midsummer on.
Perennial plants take some time to get established.
You may get a few flowers in the first season, depending on the size of the plant you've purchased, but you'll need to wait a season or two for the real show to begin. Plan to add some annual flowers to your new perennial beds to carry you through the first growing season. Annual geraniums contrast nicely with perennial salvia. Butterfly Blue' Scabiosa Long bloom season and beaudtiful color made this plant the Perennial of the Year in 2000. Stella De Oro' Daylily Sturdy dwarf variety flowers all summer.