I was a bit annoyed when my A. prainii went dormant early in summer. Made me think something was wrong with it. The next season it went into the ground in spring and then did the same. Early summer it was all shrivelled again.
Instead of being stored cool this time I kept it at ambient temperature for the rest of summer and into autumn. A few weeks ago I noticed a small shoot forming. So I planted it in a pot and just sat it in the garden. The first couple of days into winter and it's already emerged.
If it grows right up to summer again and goes dormant, then it's a winter grower. Never expected that of any Amorph. My titanum grows a full year, all seasons, before going dormant.
The prainii has only had a few months of growth the past couple of seasons. Hopefully this time it'll make it 6 or 7 months, and develop a much larger tuber.