have grown potatoes in bags too and mine seem to have come up to the top of the bag in some but not in others. i put about 3 inches of compost in the bottom then 3-4 seed potatoes then another 2 inches of compost. i have watered them regularly as we have been having alot of fab sunshine lately so have ben earthing them up when they get a couple of inches above the compost thenwater every evening. when the potatoes are at the top of the bags, how log before i can harvest them.
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