Within a plant species, the difference in hardiness due to regional adaptation is called:

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Hardiness differences within a plant species that come from the region where the plant population originated reflect provenance—the geographic origin and its environmental history. Provenance helps explain how a population has genetically adapted to local conditions, such as colder winters or hotter summers, so plants from a particular provenance are better suited to that climate.

Acclimatization is the plant’s short-term, reversible adjustment to changing conditions within its lifetime, not a fixed regional difference. Survival simply describes continuing to live, not the origin of adaptations. Variety is about a taxonomic subgroup within a species and isn’t specifically the term for regional adaptation. Provenance uniquely captures the link between origin and adaptive hardiness.