I saved a 2 inch piece of healthy cactus that was dying and planted it. That was a few years ago. It thrives in the NW sun.
Not exactly pretty but it has lots of character. It does its own thing.
One day when I have time, I will transplant it into a more attractive container. You can’t see it, but it’s in a very small lady bug mug.
If plants have gender, I think this one is a boy. 😉