I have two top hat blueberry plants and another dwarf variety. All 3 are in pots. This fall one of the bushes leaves turned red and eventually fell off, but the two top hat bushes never changed. About half of the leaves fell off, but they didnt turn red. it is too cold for the plants to stay outside at this point. (its 18F right now) I want to put it in the garage with the other bush for the winter, but it isnt changing color. what should I do with the plants?
Thank you for your help