Overwintering container 'Sunshine Blue' Blueberries 6b
I don't know how to overwinter my container 'Sunshine Blue' blueberries in zone 6b. I know they need some cold weather, but how cold is too cold? What low temperature Fahrenheit do they require and for how long?
They could stay outside under a covered patio tucked up against the house. I have burlap and straw available to wrap them in if need be.
They could come in to an unheated garage. I am not certain of the temperatures as I have a greenhouse structure in there with HPS lights in it during winter and I know they do drive the temps up somewhat. I'd be sure and stick a thermometer out there to judge how much that affects the rest of the garage.
I am mostly curious as to how cool they need to be for how many days. I can move them around with a fair amount of ease, so if they could stay in a protected area outside until it gets to below XX degrees and then come into the garage, that would be fine.
Mainly looking for specific temperatures to aim for, and for how long.