Thread Leaf Coreopsis 'Moonbeam'

Coreopsis verticillata, thread leaf or whorled coreopsis, is a rhizomatous perennial growing in dense, bushy clumps to 1-3' tall. It has yellow, daisy-like flowers with yellow untoothed rays and yellow center disks. It blooms profusely and is lengthy in loose clusters (cymes) from late spring to summer. A mid-summer shearing will promote reblooming in the fall. A plant with palmately 3-parted leaves and thread-like segments appears fine-textured and airy.

'Moonbeam' is more compact and features pale yellow, daisy-like flowers with untoothed rays and darker yellow center disks—1992 Perennial Plant of the Year award.

A well-drained, dry to medium moisture soil with full sun is ideal for its growth. It grows well in poor, sandy, or rocky soils with good drainage. Tolerant of heat, humidity, and drought. Prompt deadheading of spent flower stalks can be tedious for an extensive planting but tends to encourage additional bloom and prevent unwanted self-seeding. Plants may be sheared in mid to late summer to promote a fall rebloom and to remove any sprawling or unkempt foliage. Species plants can spread aggressively in the garden through rhizomes and self-seeding.

Although species' plants freely self-seed, 'Moonbeam' is a sterile cultivar. Plants can spread aggressively in the garden by rhizomes.