Hi -

No experience with kataf specifically, but I do have C. Monstruosa and Bursera Fagaroides. I am not a big fan of these succulents in plastic pots (prefer terra cotta), and straight perlite seems a bit austere to me (I prefer a mix with coir, some topsoil, coarse perlite, dynarok, turface), but a lot depends on your growing conditions, I suppose.

My pachycaul succulents are under metal halide lighting in a warm sunroom with skylights - so lots of warmth and light. I have kept my Commiphora very dry all winter (water once or twice a month at most). Bursera, too. They are now starting to wake up. That said, my impression is that they can both "tolerate" some watering during dormancy. If you are getting budding and leafing out, I would expect that you should start watering. How frequently do you water and does the soil dry out between?

Where are you located and how cold does it get by your window? How much light does it get - If they are like others of the species, they love direct sun. Try googling for care instructions that you may be able to extrapolate to your conditions.

Or, call Guy Wrinkle.

Good luck.

Tom