Coreopsis verticillata is a popular perennial that has cutleaf foliage and a relatively long bloom period in summer. Threadleaf Coreopsis has cultivars having showy flowers in various shades of yellow. It differs from Coreopsis lanceolata (also known as Coreopsis grandiflora) in that the latter has large lance-shaped foliage, slightly larger flowers that are in the gold and orange shades of yellow, and retains a clump-forming growth habit with age.
Alternate common name: Whorled Tickseed
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F E A T U R E S |
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Form
-small herbaceous perennial
-maturing on average at 2' tall x 2' wide, but cultivars are often slightly more compact
-initially an upright clump growth habit, becoming radiating and rounded with age, then spreading by underground rhizomes to form a dense colony |
Foliage
-medium to dark green, opposite, and without petioles (leaves are sessile on the stems)
-fine-textured and extremely cutleaf, with the simple leaf deeply cut into linear segments, resembling at first glance a pinnately compound leaf or needle-like -leaves in a whorled arrangement around the upright stems |
Flowers
-shades of lime, yellow, and yellow-orange, depending upon cultivar; the disk and ray flowers are almost the same color
-flowering in July, then either continuously or sporadically for the remainder of the summer |
Fruit
-small fruiting heads, borne at the center of each flower, have many small seeds (supposedly resembling ticks, hence the common name), and are best sheared off after the flush of early summer bloom, to promote sporadic rebloom later |
Twig
-not applicable |
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Trunk
-not applicable |
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C U L T
U R E
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Culture
Culture
-full sun to partial sun
-performs best in full sun in moist, well-drained soils of average fertility, but is tolerant of various urban stresses, including poor soils, dry soils, thin soils, soils of various pH, heat, and drought
-propagated primarily by crown division
-Daisy Family, with few disease or pest problems
abundantly available in containers
-often needs division every third year for rejuvenation and to keep it inbound
-deadheading after the initial flowering period in mid-summer will encourage rebloom later in the summer or early autumn |
Hardiness
-zones 3 to 9
Origin
-native to the Southeastern U.S.
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U S A G E |
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Assets
-very showy and profuse yellow flowers in early to mid-summer, with the potential for sporadic rebloom if deadheaded
-fine-textured cutleaf foliage
-rapid establishment, with high ornamental appeal
Liabilities
-can easily get out-of-bounds within 3 yrs. when in rich, loose soil due to its shallow, spreading underground stolons |
Function
-beds, borders, mass plantings, entranceways, foundations, raised planters, and naturalized sunny areas
Texture
-ultra-fine texture
-thick density |
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S E L
E C T I 0 N S |
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Varieties
and Cultivars
- Search
OSU PlantFacts for additional plants in this species
Alternates
-summer-flowering perennials with warm colors (Coreopsis lanceolata, Crocosmia x crocosmiiflora, Helenium autumnale, Heliopsis helianthoides, Hemerocallis, Kniphofia, Rudbeckia nitida, etc.) |