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This is probably me for my pots. https://www.lfgss.com/comments/16258118/
However, I do put bubble wrap and polystyrene around and under the pots. Then the coffee sacks go on to make it all look less shit.
If I need to pop a fleece sock on top I just do that without worrying about the look as often that period is shorter. Whereas the coffee sack can just stay until that extra frost that catches you out has passed.
Latest Gardener's World showed a place in Leeds that uses old coffee hessian sacks that have had duffel coat buttons sewn on; basically made a coat for each fern. Very Instagram-friendly.