Hi James, There are a few diffent white forms of T. simmleri, some are quite weak. I actually named one that I obtained from California several years ago. I called it Tulbaghia simmleri 'Cheryl Renshaw' and grown well it is stately as many good Agapanthus. One of the best Tulbaghia. Regarding hybrids, there are a few bicolored pink and white forms of T. simmleri about and these have either been wild selected or crosses between the pink and the white. I would hazard a guess that if you've enough seed you'd probably produce one. This Tulbaghia is one of the least hardy and isn't grown outdoors much in temperate climates; ideally it wants frost free conditions if grown outdoors as its seasons of bloom are usually mid-winter and mid-summer. In the UK if grown in a conservatory you are almost guaranteed flowers on Christmas Day. In my experience I would say it is shy to produce seed if left to chance; and probably the least promiscuous of the genus. Best Wishes, Dave (Penzance, UK. ex NCCPG National Collection Holder of Tulbaghia)