cold frame q's
i need to use a cold frame this year for all my plants that need overwintering ready for next year but have a few questions, i say cold frame in the loosest terms as it is an empty wooden planter on wheels that will have an old window placed on top, the planter is 13 inches high by 12 inches wide
so over winter do i
1) water the plants and then leave them in there unattended overwinter
2) leave the glass window flush on top (closed) or leave it propped up a bit?
3) anything else i should do to keep them safe
oh and i have some delphiniums that are almost garden planting size, should i plant them now or put the in the 'coldframe' ?