Illustration
Designer Threads Heartstrings Coreopsis
Coreopsis verticillata 'Heartstrings'
Also called heartstrings threadleaf tickseed
Also comes in white.
Designer Threads Heartstrings Coreopsis blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Designer Threads Heartstrings Coreopsis
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 5–9. Expect it to reach about 20 in tall and 20 in wide at maturity, in roughly 2 years (a house reading).
Is Designer Threads Heartstrings Coreopsis toxic to dogs or cats?
- Listed as non-toxic to dogs and cats by NC State Extension.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Designer Threads Heartstrings Coreopsis
Plant Designer Threads Heartstrings Coreopsis in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 7, the middle of its hardy zones 5 to 9, spring means March to May and fall means September or October. Once settled, it blooms from June to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 7, the middle of this plant's hardy range, start with zone 7 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Designer Threads Heartstrings Coreopsis get?
20 intall5 ft 7 inan adult20 inwideSee Designer Threads Heartstrings Coreopsis in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Designer Threads Heartstrings Coreopsis
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Designer Threads Heartstrings Coreopsis about 20 in apart, center to center, so each plant has room to reach its full width.
Add Designer Threads Heartstrings Coreopsis to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Designer Threads Heartstrings Coreopsis' height, spread, hardiness zones, sun, water, bloom color and trait tags were checked against 11 published sources on October 20, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Plant Addictsqueue storeheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- sambridgeathome.comSam Bridge at Home, Connecticut nurseryheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- Walters Gardensbreederheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- mniplants.comMillican Nurseries, New Hampshire growerheight, spread, hardiness zones, sun, bloom months and color and trait tags
- usperennials.comUS Perennials, Indiana nurseryheight, spread, hardiness zones, water, bloom months and color and trait tags
- US plant patent (Google Patents)Hans A. Hansen / Walters Gardens, PP36,055, Google Patents HTMLheight, spread, water and bloom months and color
- Proven Winnersintroducer brandheight, hardiness zones, water and trait tags
- pridescorner.comPrides Corner Farms, Connecticut growerheight, spread and hardiness zones
- US plant patent (Google Patents)Hans A. Hansen / Walters Gardens, Golden Needles PP36,034, Google Pate...water and bloom months and color
- mniplants.comMillican Nurseries, Darling Clementine (template control only)bloom months and color
- US plant patent (Google Patents)Hans A. Hansen / Walters Gardens, Scarlet Ribbons PP35,961, Google Pat...bloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
Where it grows wild
A garden form of Anacis verticillata
Its wild parent is native to 17 states.
United States: Alabama, Arkansas, Connecticut, District of Columbia, Georgia, Kentucky, Maryland, Massachusetts, Mississippi, New Jersey, New York, North Carolina, Ohio, South Carolina, Tennessee, Virginia, West Virginia and 5 more
Range data from the World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 4.0, adapted) and USDA PLANTS. How the native range is credited.
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.