Yes, it s Eve's needle/pin - Austrocylindropuntia subulata, could be f. monstrose. It should be straight, self-supporting - but you know why it isn't quite. I would repot it into own pot so other plats don't interfere....Should have some branches too. I am not sure I would bother beheading it, only if stem is really skinny. But you can. I have monstrose, and it has lots of branches.

To add on top of what Rina has already said, I personally wouldn’t cut the cactus. It really isn’t bad. Overtime that skinny bottom area will thicken up and callus over once you acclimate to stronger light. This cactus can take all day sun, and have beautiful flowers!

Your second cactus is an Echinocactus grusonii. This is another cactus once acclimated it can take all day sun. Your little cactus’ tubercles are starting to line up and form ribs. Echinocactus grusonii looks very different as a mature plant.

Def want to pot these two up separately because they both have the potential to be ginormous🌵one day.

Thank you both!!!

You've been a great help!

These came from a gift shop at the Desert Museum , in Tucson, Az. I think it's funny these will get huge. lol.. at least the pot had a drain hole. lol

I plan to separate them this week. I am going to start an in ground cactus garden along my driveway and wanted to put these in it if I can. I will do some research on both to make sure they will go ok. It will be full sun in zone 9b.

Kara,

I already have 2 huge golden barrels, lol.. Guess I will have a 3rd someday. lol.