Kent,
United Kingdom 
how can i frost proof my garden pots
how can i frost proof my garden pots
24 May, 2010
Answers
You can seal them with thompsons waterproof seal paint inside and out (safe to use, will not harm plant in pot)
24 May, 2010
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Try wrapping them in bubblewrap over winter or put them in a greenhouse etc.
24 May, 2010