Oh dear, first time trying to grow potatoes (in bags) and I've completely messed up. Thought you were supposed to earth up as soon as you saw a green sprout so that's what I did today. It didn't feel quite right... Now I read you're supposed to wait until the shoots are quite tall before earthing up for the first time. Have I ruined them? Is there any chance they'll battle their way through the couple of inches of compost I've chucked on top of them and carry on growing?