Designer Threads 'Heartstrings' Threadleaf Coreopsis

Designer Threads® ‘Heartstrings’ is a named Coreopsis verticillata cultivar whose cream flowers have a dark reddish-pink eye. Proven Winners lists a mounded habit, green foliage, full-sun exposure and summer flowering, with an 18–20 in. height, 22–24 in. spread and zones 5a–9b. ## Garden Use Plant ‘Heartstrings’ in a sunny perennial bed or mass planting, leaving room for its wider-than-tall mound. The pale petals and saturated center make a clear focal detail among other summer perennials. Proven Winners notes drought tolerance after establishment and recommends well-drained soil. ## Selection Identity The breeder identifies the cultivar as ‘Heartstrings’ and lists USPP 36,055 and Can PBRAF. A patent listing identifies the distinct cultivar PP36055 and publication date July 30, 2024. The source supports the cultivar and patent fields, so the existing “USPPAF” suffix is removed from the scientific name while the exact selection name remains. ## Maintenance Keep new plants watered as they establish and adjust irrigation during prolonged dry weather. Remove fading flower heads when a neat appearance is preferred. Sources: [Proven Winners Designer Threads® ‘Heartstrings’](https://www.provenwinners.com/plants/coreopsis/designer-threads-heartstrings-threadleaf-coreopsis-coreopsis-verticillata) and [Justia’s Coreopsis plant-patent listing, PP36055](https://patents.justia.com/patents-by-us-classification/PLT/417).