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If the bottles get full of water and then freeze I would be worried that they might crack.
Watch it, you don't want to pop your cork Kev ;DIf they are wine bottles does one just PLONK themn in? ;D ;D
If you're putting them neck down, you are taking the wine out first I hope?(Well, it might alter the ph levels in the soil....)
The previous tentant of my plot used bottles as a edging, I have been on the plot now for the best part of ten years and I`m still getting cuts from the broken glass. If the previous tentant was still alive I`d do him under the heath and safety.
Yes if the glass gets broken you'll have plenty to wine about. ;D ;D ;D ;D ;D