P.S. Maybe you have been growing too many potatoes for your normal use. As potatoes will start sprouting prior to their need to reproduce. The closer we get to planting time the quicker the potatoes will sprout. that's why shop potatoes sprout so quickly as they have been in storage for a while (somewhere). The new crops coming in from places such as Egypt and Cyprus are at the beginning of their cycle. Hang on to them long enough and they also will start sprouting.