![]() If you prefer earlier blooms, start seedlings indoors about 4 to 6 weeks before setting them out after that last frost. Morning glories usually require about 2½ to 4 months to go from seed to bloom, so those sown outdoors after the last spring frost generally won’t flower until late summer and autumn. When is the best time to plant morning glory? Another option is to start the seeds indoors in biodegradable containers that can be planted themselves. Since morning glories resent root disturbance, it’s a good idea to sow them directly in the ground, especially in zones with longer growing seasons. RELATED: 13 Plants You Never Knew Were Weeds Convolvulus tricolor: Also known as “dwarf morning glory,” this species grows 6 inches to 1 foot high with oval leaves and flowers 1½ inches across, which remain open all day and are similar to Ipomoea tricolor.It is a perennial ground cover that is not as invasive as some in its species. Convolvulus sabatius: This “ground morning glory” with oval foliage doesn’t surpass a foot in height and makes an easy ground cover with light blue 1- to 2-inch flowers that bloom all day.Ipomoea nil: Showy Japanese morning glories and other large-flowered types derive from this species, which can grow to 12 feet with blooms to 6 inches in diameter.Ipomoea tricolor: The species responsible for blue morning glories such as the ever popular Heavenly Blue cultivar, tricolor typically grows to about 10 feet with blooms at least 3 inches in diameter in sky-colored hues.Ipomoea purpurea: Usually growing only from 6 to 10 feet high with flowers up to 2½ inches across, this species produced the Grandpa Ott heirloom ideal for purple monochromatic gardens as well as other purple, pink, and white varieties.Originating in Mexico and Central America, the usually grown-as-an-annual vines can be perennial in USDA zones 9 to 12. ![]() When do morning glories bloom? Direct-sown plants typically begin flowering in late summer, while those started early indoors may bloom all summer. The size of a hummingbird-attracting funnel-shaped morning glory flower also varies from 1 to 2 inches in diameter for low-growing Convolvulus native species to 2½ inches for Ipomoea purpurea varieties, and up to nearly 6 inches for I. Ipomoea vines climb 6 to 12 feet and twine in a clockwise direction, but some Convolvulus types don’t surpass 1 foot in height and branch rather than twine. However, cultivars commonly grown by gardeners mostly derive from the Ipomoea purpurea, I. The Convolvulaceae family includes hundreds of plants, one being the sweet potato. Safety: Toxic Morning Glory Characteristics Soil: Only moderately fertile, well draining Hardiness Zone: USDA zones 2 through 10 as annuals about 8 to 12 for perennials ![]() Scientific Name: Ipomoea purpurea (and some Convolvulus spp.) They are less of a problem in some climates and when growing native or ornamental annual types of the flower. The vines’ tendency to spread and become invasive through self-sowing keeps even some cultivated types on noxious weed lists in many areas. Since the laid-back ornamental flower doesn’t require fertilizer and reportedly blooms most prolifically in poor soil, morning glory care is easy-perhaps too easy. To further confuse the matter, people often call all of the related plants the common name of “morning glory.” The weedy cousins tend to have smaller, less dramatic flowers tightly clinging vines and a taproot to make them even harder to pull! They are tough to eliminate once they take hold in the garden. Although the annual flower can become invasive by seeding nearby, most of its cousins-such as field bindweed-are classified as noxious weeds and prohibited in some states. A member of the Convolvulaceae family, morning glory suffers from an identity crisis of sorts.
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