United Kingdom 
This year I am growing tomatoes, peppers, cuecumbers and melons in growbags.
I have some old plastic bins, and next year I am planning to use these bins and the compost from the grow bags to grow potatoes.
Is this a good idea or could the compost from the tomatoes blight the potatoes?
2 Aug, 2011
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Personally I would not recommend using the compost from the tomatoes to grow potatoes next year just in case there is any problems in the soil. You will also need to add fertiliser to the compost as that which was in it when you bought it will have been used by this years veggies as they grew. If you have open garden it would be better to spread the compost from the grow bags on this and buy new compost next year.
2 Aug, 2011