hello! i have very largedahlia plants. i live in MAINE and don't know howto protect them for winter. they have very thick sturdy stems all the way to theground. no-one else in town digs thiers up and they survive just fine. do i prune them? do i cover them? please....some neighborly advice would be greatly appreciated :)
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they have to have a lot of thick coverage.......or the frost will kill them................hay, thick layer and maybe some heavy fabric going around some posts and fill them with leaves and hay.................In zone 7 I had to take them out.  they don't winter well, what do you neighbor do.  I know that you get snow up there and it gets very cold.  We live in 5a and we have to take them out of the ground.
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