Since paperbacks can be all sizes, it's difficult to judge size. But I don't think that's too important.

I am Not knowledgeable enough to answer your pruning questions, but that's a beautiful plant and striking pot.

The pot could be a little big. Did the roots take up most of the space in the pot? It has a hole in the bottom, right? I do not think a bigger pot would be good. Did you use a fast draining soil?

I hope you get some pruning help here. Best wishes.

And here I was thinking the pot was both too small and unfortunately shaped, since it will be a hell of a job removing the rootball in the future, without cutting roots. I would double the size of the pot to encourage larger, faster growth.

While I do like the shape, it might not be convenient to fit on a windowsill. Totally up to you how you shape it.

Josh

I agree with Josh I would put in a bigger pot. Maybe just go one size up like an inch bigger around.

1.5 liter Coke Bottle for scale. Hehe. (I can't find my ruler!) This is his windowsill home. It's almost 6am.

Socks, yes the pot has a hole and it's in very fast draining mix. (It's top-dressed in that pot). The root ball of that P. Afra is almost the size of that pot! Lots of roots.

Perhaps I should pot him a size up (I have plain terracota pots that may do) and leave him outside on the balcony with my other cacti (you see the balcony in the photo). For faster growth like Josh said.

I guess I can find another plant for that copper color ceramic pot for now. Josh is right, if the Afra gets more roots I will have a hard time getting him out of that pot!

Heres another shot of the pots. The moon is easy to get the plants in and out of. The left pot might pose a problem when roots get massive.

UPDATE: I got him repotted in his bigger clay pot! I see new growth and I "sense" his happiness! He also now lives outdoors on my balcony. Tons more sun, and even some rain splatter (he doesn't seem to mind, thanks to his ultra fast drain perlite mix).

Thanks for all the advice! I can't wait for him to be a giant bush worthy of an elephant's feast!