Posted: 07/10/2014 at 22:28
Glad to see this thread, can anyone please advise -How necessary is it to insulate a greenhouse over the winter? I was going to use mine to overwinter my new perennial seedlings and plants such as helenium, eryngium and echinacea. Also to protect tender plants such as tree fern and canna.
Will it not be enough that they are protected from heavy frost or do I need to insulate aswell?