Variety traits

Coreopsis winter hardiness

Coreopsis L.

The winter hardiness of Coreopsis is assessed according to USDA hardiness zones and threshold temperatures ranging from -7 to -35 °C. Successful overwintering is critically dependent on soil drainage, as the crop is sensitive to root collar rot during thaws.

In the reference 14 varieties crop Tickseed, where this is mentioned in the description.

To evaluate the winter hardiness of Coreopsis, temperature thresholds are used, where hardy cultivars withstand temperatures down to -34...-35 °C, while less hardy crops are damaged at -7 °C. A vital factor for survival is resistance to winter waterlogging; on heavy soils with water stagnation, plants often perish even when temperature requirements are met.

Agrotechnical practices, such as selecting elevated planting sites, contribute to increased winter hardiness. Pruning timing after flowering, particularly in Coreopsis grandiflora, significantly influences the plant's ability to overwinter. Regardless of frost resistance, the crop retains the characteristics of a short-lived perennial, requiring division or cutting propagation every three years.

General information about the subject — on the page Winter hardiness.

Sources8

Varieties of Tickseed mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.