I dug up about 5 of my amorph bulbs 2 days ago because I had them "planted" in a huge mound of dirt and bark/sawdust where we had a 5 foot diamter stump grubbed out. Just stuck a few bulbs in there this spring. Well, a few of them had the foliage die back in the last couple weeks, and I figured I'd better grub them out of there before I couldn't find where they were in that mound. Now, should I put the bulbs in some peat moss over winter? Or plant them in pots and stick the pots somewhere for the winter and just check so they don't dry out totally?
Some amorph species shouldn't be allowed to dry out, they need to be kept damp (but not usually wet) during dormancy otherwise they will completely dry out and die. The majority of commonly grown species are better dried right out, if damp during dornmancy they will rot.
It gets back to the climate they come from. Many of them are from a winter dry season climate where they die back and the ground becomes completely dry. Some are from a 2 monsoon climate where the ground never dries out. Without some moisture their tubers would shrivel up. Do you know which species you have?