Last year we had many green potatoes in both our sharpes and colleen. This year after only half our potatoes were usable. We planted last year's green ones as seed and planted them deeper, at least 3/4 of a foot. I just uncovered the first of our new potatoes, skinned them and boiled them and STILL they taste bitter and acrid. I don't know what to do. Is it our soil? It's very heavy and lumpy - 2nd year soil (previously a field). Is there any way we can rescue the remaining crop? We live in Orkney, Scotland and everyone else doesn't seem to have a problem.