Hello all, I am new here and have little to no experience with growing a bonsai, Ive taken some advice from the courses and I want to make a soil mixture. I see there are different sizes in the coarseness of akadama, pumis and lava rocks, some are Fine (1-3mm) Small(3-6mm) and Medium(5-8mm),
Is it of vital importance which grit size I choose? OR is it more dependent on my tree type? I have 3 nursery stock trees that i am starting with: Citrus (lemon), Thuja occidentalis (Cypress), and a Portulacaria afra.
I agree with FrankC on the layering of sizes idea. Its important to remember that despite common logic a smaller pot will actually have a larger chance of water logging roots as the water table sits closer to the root ball. As long as what you do provides high drainage you should be fine either way. Following FrankC's advice will likely give you a great drainage set up.