Why do the leaves fall off in the autumn? Part III

For all leaf-bearing trees and bushes, it is therefore better to let these cells shrivel up and put energy on creating new leaf rudiments and empty as much water as possible to prevent frostbite and cell burst. In areas on earth where there is no risk of frost, the leaf-bearing plants are green year round. They even manage a few nights of frost and a total loss of foliage, but would the cold period hold for longer cells would burst and kill the plant