Pretty plants :)

I think I would at least separate echverias from cacti.

Youd still have problems, echeveria setosa is more of a shade grower, black prince likes to sunbathe. Pulidonis is slower compared to the two. The opuntia will overwhelm the other cacti with the size, and the watering regime for the mammilaria will dry out the rest, Dominyka.

Mckenna, expect the red moon cactus to croak, they dont thrive for long on their dragon fruit rootstocks.

Plastic pots, with large holes on the bottom work best. I own at least 250 plants right now, and have used plastic pots since day one, and the "nursery" large hole defaults works best. But not the default soil though.

My take on container gardens? Pretty, but 99% dont last. If you want your plants to live longer, plant them separate, and in coarse soil.

If the pot isnt perforated, it makes no difference. It would have been a better choice to mix the gravel in with the soil , especially for the mammilaria cactus. As for the space, im pretty sure this would take more space anyway,

McKenna

I agree with Stefan about using grit in the mix; but it needs to be of certain size - not sure what size gravel you are using. Particles are best if in 3-6mm size - perlite (if sifted or rinsed) is approx. that size. So if you want to add grit, that is size to look for. If you can't find it, you can mix C&S soil with perlite (sifted or rinsed), using min 50%, or as much as 75% of perlite. Adding just a handful doesn't help at all. Container with drainage holes and fast draining (grainy) mix make great growing conditions for succulents and easy for the grower.

My well-draining mix is 50% this stuff.

When I buy plants from Northern Europe I acclimatise them gradually to the fiercer Mediterranean sun. They get put in a spot where they initially get a couple of hours of afternoon sun, then get progressively moved so that after about a month they are getting full sun. I recommend you try to so something similar.