Many perennial flowers bloom year-round. Some bloom non-stop, some bloom intermittently and others require several cultivars to achieve year-round blooms. Most perennial flowers that bloom year-round are tropical plants or, in cold climates, houseplants. A few truly perennial plants will thrive in cold climates, and you can achieve year-round blooming from them with a little planning.
Abutilon, or flowering maple as it is commonly known, is a perennial flower that blooms year-round. It is hardy in U.S. Department of Agriculture plant hardiness zones 8 through 11. Gardeners in USDA hardiness zones 7 and colder should treat abutilon as either an annual or a houseplant.
Abutilon is easy to grow in containers. Since it will grow in full sun or filtered shade and still flower, getting it to keep flowering indoors all winter is not difficult.
Unless you live in a warm climate, getting annual geranium flowers to bloom year-round requires you to being them indoors over the winter. There are some perennial varieties of geraniums.
Geraniums can have single and double flowers. Typical colors include white, pink, red and purple. Some varieties of geraniums have flowers that are two colors.
Geranium leaves can be different, too--in shape and color. There are tri-color geranium leaves, leaves with colored edging and plain green leaves. Leaf shapes include ivy leaf, deep-cut leaf and twice-cut.
Hellebores are one of the few flowers that will bloom all winter, even with snow on the ground.
In recent years, hellebore flowers have been hybridized to create double blooms and a wide array of flower colors.
Hardy in USDA hardiness zones 3 through 9, depending on variety, these plants are reliable performers that will not only naturalize over time, but the original plants will come back for years.