Flowers bloom at different times of the year. As an example, sweet peas (Lathyrus odoratus) bloom early spring, while chrysanthemums (Chrysanthemum morifolium), at U. S. Department of Agriculture plant hardiness zones 3 through 9, bloom in the fall. Some flowers, like clematis (Clematis), bloom in spring, summer or fall. Other flowers, like roses (Rosa), bloom from spring through early winter in USDA hardiness zones 8 through 10. Understanding when the flowers bloom helps a gardener organize the expression of the landscape and make sure that’s it colorful all through the year.
Biennials
Biennials like hollyhocks (Alcea rosea), USDA hardiness zones 3 through 8, don’t bloom at all the first year. The energy of this plant can be used to develop a healthy bush with a strong root system. The plant blooms the next year, sets seed and then dies. Like annuals, some easily reseed themselves and develop season after season, giving the impression that they are perennials. Forget-me-not (Myosotis sylvatica), USDA zones 3 through 9, blooms in spring. Foxglove (Digitalis purpurea L.) blossoms in spring. It prefers cooler climates; nevertheless, 1 variety, “Spanish Peaks” foxglove (Digitalis thapsi “Spanish Peaks”), which rises in USDA zones 5 through 9.
Spring Perennials
Perennials contain spring flowering bulbs like freesia (Freesia), USDA hardiness zones 9 through 10, and iris (Iris ensata), USDA zones 3 through 9 . Other spring bloomers include pincushion flower (Scabiosa sp.) , USDA zones 3 through 9, which has been bloom until early fall, and bleeding heart (Dicentra spectabilis), USDA zones 2 through 9. It does not tolerate heat and shouted back in the summertime.
Summer Perennials
The summer garden is full of perennials such as yarrow (Achillea), USDA zones 3 through 9, with its flat head of hundreds of tiny blossoms in yellow, purple or pink. The blossoms are held over the plant’s foliage on sturdy stems. It’s a favored to dry. Coneflowers (Rudbekia), USDA zones 4 through 10, bloom with daisy-shaped flowers which have bright purple petals and a dark brown center.
Fall Perennials
Chrysanthemums are most likely the best-known fall flower. Colors include yellow, white, purple and rust. Among the flower forms are pincushion, quill and daisy. Flower sizes range from button mums, less than 1 inch in diameter, to spider mums, over 6 inches round. Asters (Aster novae-angliae), USDA zones 4 through 8, are another fall-blooming perennial.
Winter
Not many flowers bloom in the winter where the weather is cold and frosty. However, in warm winter areas like USDA hardiness zones 8 through 10, the fall perennials continue to bloom until early spring perennials take over. Geraniums (Pelargonium graveolens), USDA zones 9 through 12, pansies (Violax wittrockiana), USDA zones 4 through 8, and snapdragons (Antirrhinum), USDA zones 9 through 11, bloom as well.