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FutureStarrSand Coreopsis or
Coreopsis is a variable genus closely related to Bidens. In fact, neither Coreopsis nor Bidens, as defined in the 20th century, is strictly monophyletic. Coreopsis is best described as paraphyletic. Previously (1936), Coreopsis was classified into 11 sections and 114 species, but the African species were subsequently reclassified as Bidens, leaving the North and South American species, some 75–80 in all, under Coreopsis. 45 species are in the 11 North American sections, and the remaining 35 are in the South American section Pseudoagarista. The North American species fall into two broad groups, with 5 sections and 12 species in Mexico and North America and the remaining 5 sections and 26 species in Eastern North America.
Native to North America, coreopsis plants grow in upright clumps and feature masses of bright, showy, daisy-like flowers throughout the summer. The foliage of the species varies, with some varieties boasting large green leaves and others sporting narrower greenery. One of the plant's common names, tickseed, is a nod to its round seeds, which resemble ticks. Birds and other wildlife love to snack on the seeds during the fall and winter, while bees and butterflies are drawn to the colorful blooms.Overall, coreopsis plants don’t require much care when grown in their preferred environment. Select a planting site that gets lots of sun and has good soil drainage. Also, don't forget to account for the mature size of your species—when planting, leave some space around each plant for air circulation. The taller coreopsis varieties might need staking as they mature; otherwise, the stems might flop over. Moreover, deadheading your plants (removing the spent blooms) can keep the plant blooming throughout summer and into fall.
Many coreopsis varieties can be grown from seed and often will reseed themselves in your garden. Start seeds indoors six to eight weeks before your area's projected last frost date, or directly plant seeds in your garden after your last frost. Plant the seeds roughly 1/2-inch deep, and keep the soil lightly moist and warm. Seedlings should emerge in about two to three weeks, at which point you can put the seedlings by a sunny window and continue to keep the soil lightly moist. Indoor seedlings will need to be slowly acclimatized to the outdoors by taking them outside for long stretches each day for about a week. Then, they’re ready to be planted in the garden. In addition to its many cultivars, the pure Coreopsis grandiflora has been gracing gardens with its bright yellow flowers for generations. It makes an excellent perennial for novice gardeners, but experienced gardeners will also appreciate its reliability, ease of growth, and versatility. Also known as large-flowered tickseed, it can grow in just about any soil, whether shallow, lean, or chalky. It's open pollinated, so it can be grown either from seed or by division, and it will also self-seed, but not to the point of annoyance. If you don't want the volunteers, deadhead the plants before they go to seed. These plants will benefit from shearing after the initial bloom fades. (Source: www.thespruce.com)