These 'Stemster' seed potatoes are a main crop variety of potato. It takes about 15 weeks to harvest from planting, ready to dig up when the leaves start to turn yellow. Great to grow on your allotment or vegetable patch. Place the seed potatoes into 10cm (4") deep trenches and backfill the soil to refill the trenches. When shoots reach 20cm (8"), mound up soil around the shoots leaving just a few cm showing. Repeat this process after a further 3 weeks. You will get a lovely crop of tasty potatoes. One kilogram of seed potatoes will yield about ten kilograms of eating potatoes. You can buy one to five kilograms with this order.