old bulbs getting smaller
i have had some lily bulbs planted in large pots for several years, taken into my garage over the winters and brought out in spring. the plants have been getting spindly and i imagine that the bulbs have shrunk from their original large size. they do not always bloom, either.
since they have not yet utterly expired, how can i best encourage them to bulk up and bloom in future? there must be a procedure that bulb retailers do to get their saleable bulbs so big. please help! some of these i cannot find again for sale anywhere, and i'd really like to keep them.