I have these growing in the front yard and not sure if they could be used as part of a varied diet. The first one I've seen around for a couple years but they never got large enough to consider using as food.This one looks something like a weed that gets tall with a single stem and the tortoises (sulcata and hermanns) have never touched it before. I offered a couple leaves this year and they ate it like a kid eating candy.This one I actually planted as a ground cover years ago and thought is was all gone. It's not. I'm not sure but think it was deemed a no food item.This last one is Thank You.