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Well, looks like I'll have to use them for growing lots of growing mustard and cress. But for you outdoor tomato growers, I've found a good use for the square 5 litre mineral water bottles. Cut off the bottoms, slide them over the top of the tomato cane to anchor them and use them as cloches to protect your young seedlings. Using this method I find I can move them from my window ledges sooner, plant them out without worrying about frost and slugs and they actually produce flowers earlier.