Can these babiessurvive the greenhouse?
Yes, but not all at once. Take them to the greenhouse to get the sunlight and bring them back indoors at night for a couple of weeks. After that they should do fine in the greenhouse.
Exactly how much cold can cabbage transplants take?
A lot. A cabbage seedling can survive 15 degrees handily .... but again, not all at once. If they go from room temp to well below freezing all at once, they will freeze. but if you expose them to cold a few hours at a time, they will do fine. If you transplant them in situ, cover them with straw, hay, or milk jugs minus the bottom if the temps get below 25 or so. A cabbage transplant buried under snow will survive no matter what.
When transplanting anything into very cold ground or cold conditions, do not water it. It isn't growing at any rate and the water will burst the cells.
its own. I've had lettuces freeze hard as a board and when they gradually and naturally thawed, there was no damage whatever.
Cabbage that has nearly frozen in the seedling stage will be very good tasting cabbage when it is mature.
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