Variety traits

Winter Hardiness — Hibiscus syriacus

Hibiscus syriacus L.

The winter hardiness of Hibiscus syriacus is evaluated on a five-point scale during the period of mass shoot regrowth and is characterized by the shrub's high regenerative capacity following winter damage.

In the reference 7 varieties crop Rose of Sharon, where this is mentioned in the description.

To assess the winter hardiness of Hibiscus syriacus, a five-point scale is used, with evaluations conducted during the period of mass annual shoot regrowth, which typically occurs in the second to third ten-day period of May. The assessment is based on the degree of frost damage to the shrub and its subsequent ability to restore crown volume and enter the flowering phase, which is a key biological feature of the species.

The minimum winter hardiness threshold for using cultivars in landscaping and continuous flowering sequences is 3 points, with scores of 4 points considered good. Cultivars with a score of 1 point are classified as not winter-hardy. An important agrotechnical element contributing to the improvement of this indicator is autumn fertilization with phosphorus-potassium fertilizers to stimulate shoot lignification, as well as mandatory late-autumn irrigation before the onset of frost.

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

Sources7

Varieties of Rose of Sharon 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.