I am a bit confused about the light requirments of the different species of these plants. Some of them look like their relatives, the agavies. It seems they would almost like some full sun, and yet all I read says bright light or even full shade. I have one sitting in my den, but it looks so "cactus-like", I worry that it is not getting enough light there. I also put some of them on a North side of a wall but at one spot it has a tree overhanging it and it is very shady under there. I have had the regular type of sans before and am well aware that they can take quite low light situations, but now that I have a few of the more diverse kinds, I am getting confused as to where I can safely put them. Any input on this would be appreciated.