I have Ruksans' book on bulbs and I've spent hours drooling over the incredible number of corydalis, so all I know is that I want to try more... Robin Oregon USA which species interest you? Most of the Leonticoides species rarely divide except as bits from old tubers. They have to be grown from seeds. The solida / cava types do divide, as do species such as nudicaulis, shangii, glaucescens..... Peter (UK) _______________________________________________