A Detailed Guide to the Morphological Characteristics and Management Methods of Coreopsis

Morphological characteristics

A perennial herbaceous plant with a perennial root system. The leaves are mostly opposite, rarely alternate, entire, shallowly lobed, or deeply cut. The flowers are solitary or in loose panicles; the involucre is in two rows, with 3 bracts per row, fused at the base. The ray florets are in 1 row, broadly ligulate, yellow, brown, or pink. The disc florets are yellow to brown.

Main species: Coreopsis basalis, plant height 30~90cm, the whole plant sparsely covered with long hairs, leaves entire and shallowly lobed, stem leaves oblong-spatulate or lanceolate, stem leaves 3-5 lobed, capitulum diameter 6-7cm, with long peduncles, flowers golden yellow.

Large-flowered coreopsis Coreopsis grandiflora is slightly hairy throughout, branched, basal leaves lanceolate, entire, upper leaves 3-5 deeply lobed. Capitulum 4-6.3cm, inner and outer rows of involucral bracts nearly equal in length. 8 ray florets, yellow, 1~2.5cm long, apex 3-lobed, disc florets also yellow.

Coreopsis lanceolata, hairless or sparsely covered with long hairs, leaves mostly clustered at the base or a few opposite, leaves on the stem very few, capitulum diameter about 5-6cm, outer row of involucral bracts usually shorter than the inner row, 8 ray florets yellow, apex 2~3-lobed. Disc florets yellow. Whorled coreopsis Coreopsis verticillata is hairless, sparsely branched, leaves whorled, sessile, palmately 3-parted deeply lobed, each lobe further finely divided, disc florets yellow to yellow-green.

Origin and distribution

Native to the southern United States

Growth habits

Coreopsis species are cold-tolerant and drought-tolerant, not demanding about soil, light-loving but tolerant of partial shade, highly adaptable, and strongly resistant to sulfur dioxide.

Propagation

Easy to cultivate and often able to self-propagate. In production, sowing or division propagation is mostly used, and cuttings can also be done in summer. Sowing propagation is generally carried out in August, or direct sowing in the open field at the end of April in spring, flowering in July-August, with flowers continuing to bloom until mid-October. Biennial coreopsis blooms from late May to early June in early spring and continues blooming until mid-October. To make coreopsis bloom more, remove spent flowers after blooming and apply fertilizer once in July~August, and it will have abundant flowers and lush leaves by National Day.

Ornamental applications

The branches and leaves are dense, especially when young leaves sprout in winter, forming patches of fresh green. Between spring and summer, the flowers are large and brightly colored, often blooming continuously. It can also self-propagate, making it an excellent ground cover for open woodlands. It can be enjoyed for both its leaves and its flowers. It works extremely well as a covering material in roof greening and can also be used as a flower border material.