as an enthusiastic but rubbish gardener, can any one tell me if it's normal for my potato plants to be six feet high and also, when should i dig them up to harvest whatever they've produced. i should add that some of them are flowering now. i cant remember when i planted the seed potatoes but it was before this hot spell ... might have been a couple of months ago. this is my first post, so if i've put it in the wrong place, can someone tell me where it should go, and how to put it there. thanks.