Coreopsis verticillata

Coreopsis verticillata (Thread-Leaf Coreopsis) is a perennial plant  in the Asteraceae. The common names of the species are Whorled Coreopsis, Thread-Leaved Tickseed, Thread-Leaf Coreopsis.

Easily grown in dry to medium moisture, well-drained soil in full sun. Thrives 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 a large planting, but does tend to encourage additional bloom. Plants may be sheared in mid to late summer to promote a fall re-bloom and to remove any sprawling or unkempt foliage. Although species' plants freely self-seed, 'Moonbeam' is a sterile cultivar. Plants can spread somewhat aggressively in the garden by rhizomes.

It is a rhizomatous perennial which typically grows in dense, bushy clumps to 1'-3' tall. 'Moonbeam' is somewhat more compact (to 2' tall) and features pale yellow, daisy-like flowers (1-2" diameter) with untoothed rays and darker yellow center disks. Flowers appear singly in loose clusters (cymes) in a lengthy late spring to late summer bloom period which sometimes extends to first frost. Shearing plants in mid-summer (early August) when bloom usually tapers down will encourage a fall rebloom.