Christiaan, I am curious what you mean when you say the bulbs renew each season. Most or all of the SA bulbous spp. I grow (several dozen) build up thick multi-season tunics around their bulbs, which seems to suggest a 'sedentary' organ that functions like a normal bulb. What is radically different, though, is how the new shoots, somewhere between the top of the bulb and the soil surface, produce that season's root system anew. The bulb itself also has roots (from the base) but these may be secondary? Do any other dicots have what could be called bulbs? Dylan