The white powder stuff is sand on the leaves, potting is crushed clay brick, rocks, perlite, charcoal, orchiata, sand & fir bark, I make my own potting mix. I don't fertilize very often
Very interesting combo. I can see more orchiata though. I am slowly going towards loose potting but i limit my mix to just four materials.
So does sand really stays mixed or does it eventually settle at the bottom?
Sand helps quite a bit especially with deflasked seedlings, most of it washes out, I find it promotes root growth, just my experience, a flask I got paph angelina kruger, the compot with sand all have new roots growing in it the other didn't so I added it to the other as well