KD, yes they are supposed to have a obligate dormancy, although I have heard that in some climates they do not go dormant.
There is a good article and I will see if I can add to here. It is on the differences between Arabicums and Thai Soco's.
Rick
"Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I received"