Pod, I washed all my driftwoods when I got them, but will be on the watch for anything that might signal salt content. Purpleinopp, your pots are masterpieces, I don't know whether you studied art but your combinations seem to have well done proportions. My driftwood is an attempt to help with the proportions in my pots while the plants are still little.
Philipwonel oh yes EVERY pot has drainage holes. And I have extremely well draining soil having added perlite and pumice to the soil, and the Lithops are in 75% pumice. The Lithops garden has a layer of black aquarium gravel over the pumice because I thought the Lithops showed up much better on a solid black background.
The Christmas cacti soil has a bit less added perlite but still drains well. And the orchids are mostly in plain leca in fern root bowls with a bit of moss on the surface.
Most of my past gardening was outdoor gardening and I had many roses. I particularly miss the 40 foot hedge of fragrant Louis Philippe, which were around 6 feet tall, that grew from a bunch of little two inch pots. Rose people have a saying, that they would rather have a two dollar rose in a ten dollar hole than a ten dollar rose in a two dollar hole. They are of course referring to preparation, and I think the same principle might be true indoors, that research done and money spent on appropriate soils/pots is worthwhile.
Of course, I realize that there is no substitute for experience. I tread lightly and practically say a prayer any time I even look at the Lithops, and spend a lot of time lurking here and looking at how other people are growing their cacti/succulents.
PS I love Quark.