Is this a dyckia?
I bought it at my local urban garden last year. It was in the pot with a reddish clay soil (not potting soil), and the plant was just sitting on top of it, rootless. I presumably thought it was another one of those ornamental pineapple top that I have before that came off from the fruit.
I repotted it, I think it needs another repot soon, with some difficulties because of the thorns. Those thorns are vicious!
Is this another ornamental pineapple or a dyckia? Or was my first guess correct?