Gloriosa Lily (Gloriosa superba 'Rothschildiana')
In the comments at the bottom of this page is a detailed post on how I grow them. Also, in the pics on this page are some of the tubers amassed after re-potting.
I started out with three small tubers from Missouri Botanical Garden (Mobot) in St Louis year's ago. and as noted previously, my stock grew to 400.
Gloriosas are one of the 4 cornerstones of my garden.