Nope I have to add peat at the end of the season to have some organic material that lightens up the soil, and I don't think its very nutrient rich either. The 'triplemix' I ordered this year seemed to be mostly clay and manure, very heavy, and appears to be too nitrogen rich. Some of the potatoes were the size of my fist after about 4 or 5 weeks. Some worked but many are just too big, and I can tell when I pick them up that they are a little lighter than they should be, and are hollow inside
