I'll second what Toddy says - every bit as useful as useful as Aloe vera for burns, rashes, stings etc - just tear open the leaves and apply the gel found inside. In an old house I used to live in, I had these growing prolifically on the roof of an outbuilding, so good and easy to reach when needed. I've tried growing them in the garden but with limited success - they really do need very good drainage and as they grow fairly slowly, don't like competition, hence why they do well on old slate roofs. Would do well in a rockery or alpine garden though. And they have very pretty flowers though they will often die back after flowering. However, by the time they're ready to flower, they will usually have budded off to form small daughter plants around the rosette of the parent plant. Lovely little plants.