meizzwang

Growers have reported Kru sulks when exposed to temperatures 40F or below, so if that is true, this cultivar isn't very cold tolerant.

from ventura bananas:

"Knowing the genetic makeup (ancestry) of a cultivar can usually give you a pretty good idea of how tolerant of cold it is likely to be, but there are exceptions.

Almost all edible varieties,[edited] are derived from Musa acuminata ("A" genome) or Musa balbisiana ("B" genome). Because M. acuminata is strictly a tropical species (i.e., its ancestral range), whereas M. balbisiana's natural range is tropical and subtropic, cultivars that are entirely derived from M. acuminata are generally less tolerant of cool or dry conditions than those that have some M. balbisiana genes.

For example, Pisang Awak cultivars (e.g., Dwarf Namwah, "American Misi Luki") and Bluggoe cultivars (e.g., Orinoco, Dwarf Orinoco) have ABB genomes and they are among the most cool tolerant; whereas Cavendish and Reds, which both have AAA genomes are among the least tolerant of cool climates.

Of course there exceptions to this general rule, and the AAB group has good examples of that. For example, Pome subgroup cultivars (e.g., Brazilian, Dwarf Brazilian, Rajapuri) and Mysore cultivars (Mysore, Pisang Ceylan/Klotek) are pretty tolerant of cool conditions, whereas plantains and some other AAB cultivars are not."