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Even when surrounded by "mulch", your pot will likely be frozen solid by the time the top 4" of the earth is frozen... and will begin to thaw on a warm sunny day, especially as late Feb rolls around...
Not only will the mulch not be very effective above the earth,,, but the pot will not hold enough water to prevent dessication from the cold air and especially wind... use a pickaxe if necessary,,, but get those pots in the earth, soak them down and mulch over the top...
That method is as foolproof as correctly planting them... continue to water until the mulch is either frozen to the topsoil or under snow...
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Water/air ratio in relation to water flow to/from any plantlife is a Basic Fundamental Concept in understanding seed germination as much as transplanting a 20' Maple tree in 90 degree weather...
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