This is my first year of growing my own and I'm growing kestrel potatoes which I planted mid February in a "potato bag" rolled down. Since then I have been earthing up until the bag is full. There is about 2ft of soil and 1.5ft of foliage which all looks really healthy. I've had a little forage around (about 8 -10 inches down) and there isn't even a hint of a potato!! Am I doing something wrong or just being impatient? The plants are not flowering either!