I usually store half of the tubers I dig in the fall in a dorm size refrigerator. It stays around 44-46 degrees, which is fine. If I buy packaged clumps in late Feb/early March I put them in a cool, dark place, like a corner of the attic to try to delay sprouting. I take them out in mid-April to let them warm and start sprouting. Mine go into planters around the first of May and planted in the garden 3-4 weeks later. But I don't worry about the ones I'll soon be receiving. They'll be fine till time to put them into planters. Do you plan to start yours early in pots or just wait and plant the bare tubers in the ground?