Variety traits

Frost resistance — Buddleja davidii

Buddleja davidii Franch.

The trait is characterized by the ability of the root system and the root zone to maintain viability at sub-zero temperatures. The crop corresponds to USDA zones 5–9, where the aerial part may freeze, and the plant recovers in the spring from dormant buds at the root collar.

In the reference 13 varieties crop Butterfly bush, where this is mentioned in the description.

For Buddleja davidii, frost resistance is not defined by a quantitative LT50 threshold but is assessed by its classification within USDA hardiness zones 5–9. At temperatures below -15°C...-20°C, the risk of mortality for the aerial structure is critical, which forces the plant to exhibit the properties of a herbaceous perennial.

The winter survival of the crop depends directly on soil drainage, temperature stability, and the presence of root collar protection. Given that flowering occurs on current-season shoots, annual freezing and subsequent spring pruning do not hinder the full development of inflorescences, determining the habit of the shrub.

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

Sources8

Varieties of Butterfly bush 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.