Variety traits

Winter Hardiness of × Heucherella

x Heucherella H. R. Wehrh.

The winter hardiness of × Heucherella hybrids is classified according to USDA hardiness zones ranging from 4 to 9, corresponding to survival at temperatures down to -34°C. Successful overwintering critically depends on preventing water stagnation and protecting the root system from frost heaving.

In the reference 9 varieties crop Foamy bells, where this is mentioned in the description.

For members of the genus × Heucherella, winter hardiness is assessed as the plants' ability to withstand conditions in USDA hardiness zones 4–9. Compliance with zone 4 is considered a high indicator, where plants can withstand extreme temperatures of approximately -34°C. In regions colder than zone 4, plants require mandatory mulching or are cultivated as annuals.

Critical factors for overwintering this crop include soil moisture and the physical condition of the soil. Excessive moisture during the winter period causes rotting of the root collar, while soil freezing leads to frost heaving of the plants. Depending on climatic conditions, vegetative organs may persist as evergreen or semi-evergreen foliage or die back during harsh winters.

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

Sources8

Varieties of Foamy bells 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.