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May 25, 2014 11:38 AM CST
I'm in Calgary, an experienced uk gardener but new to gardening in Calgary. I am keen to overwinter as many of the perenials as I can from the pots to save buying them again next year. I have a cold room at a few degrees above freezing and I read with interest many people's suggestions. If I chose the dormant inpot method how can I ensure there are no insects in the soil?