Denis Huel wrote:I frequently store potted trees over winter in Saskatchewan. I simply dig a trench the width and depth of the pots and place the pots in the trench filling the spaces along side and between the pots with some of the excavated dirt. Chose a sheltered area where snow will cover the ground. Make sure the plants are well watered before freeze up. You could mulch with leaves but run the risk of mice settling in for the winter. I occasionally lose the odd plant. I suspect drying is the culprit. I overwintered some butternut trees last winter without any difficulty even though the coldest temperatures of the year occurred (-30C) in the first half of November when there was no snow.