Variety traits

Frost resistance of Buddleja

Buddleja L.

This trait is determined by the ability of the root system and the aerial parts to withstand temperatures from –15°C to –25°C. In many Buddleja species, shoot dieback occurs while the roots remain viable, necessitating a specific approach to agrotechnics and pruning.

In the reference 7 varieties crop Buddleia, where this is mentioned in the description.

The frost resistance of Buddleja is assessed via survival temperature thresholds and correlation with USDA zones. For most varieties, the critical threshold is –15°C...–20°C, at which protection is required. A significant difference between species is noted: for example, Buddleja alternifolia possesses greater winter hardiness than Buddleja davidii cultivars.

In Buddleja davidii, shoot dieback to the soil level frequently occurs, yet the root system remains viable. Since the crop blooms on current-season growth, freezing of the aerial part does not prevent flowering. In such cases, radical spring pruning to the stump is employed, stimulating rapid regrowth of the shrub, which in cold climates effectively functions as a herbaceous perennial.

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

Sources8

Varieties of Buddleia 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.