Please identify. A neighbor gave to me - do I want it?
Hi. I saw these growing in a neighbor's yard and asked if I could have a cutting. I received several cuttings and put them in a paper bag a short time ago.
Is it a cactus or a succulent? I've seen them in green and I've seen them in red. If they are red, does that mean they are in too much sun?
How are they used in a landscape or garden? I don't want something that will be overly aggressive - especially since they are very sharp! Looking at the picture, though, they do seem like they spread like wildfire.
Oh, what to do?