Variety traits

Winter Hardiness of Roses

Rosa L.

The winter hardiness of a rose is determined by the plant's ability to withstand a complex of winter-spring factors, including humidity and thaws, and is evaluated using a 7-point scale and USDA hardiness zones.

In the reference 555 varieties crop Rose, where this is mentioned in the description.

The winter hardiness of roses is evaluated as the plant's ability to withstand adverse conditions of the winter-spring period, including air humidity, snow cover stability, and recurring frosts. In scientific practice, a 7-point scale is used to analyze the condition of shoots, buds, and tissues after overwintering, while USDA hardiness zones are used for the preliminary selection of varieties.

The genetic potential for winter hardiness varies significantly between rose groups. Hybrid tea varieties, originating from the thermophilic species Rosa chinensis, possess low winter hardiness and are sensitive to sub-zero temperatures. In contrast, species roses and hybrids of the Rugosa group demonstrate high resistance, adapted to harsh climatic conditions.

Agrotechnical measures for covering roses depend directly on the winter hardiness rating of a specific variety. One of the key problems during cultivation is the risk of tissue damping-off under cover during thaws, which makes winter hardiness the determining factor for the longevity of plantings under specific microclimate conditions.

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

Sources8

Varieties of Rose 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.