Thanks for the reminder about our Master Gardener. I really haven't done anything other than admire them.We do have a newly graduated Master Gardener here. But my first guess would be to feed them some lime and loosen the dirt around the bulbs or risone. The soil may have become compacted and it also needs to be sweetened. Also make sure you don't have any underground critters that just love to chew on bulbs for a snack.