Mine are just in regular potting mix that I make up of pine fines, peat, perlite, biochar and then whatever fertility like fish emulsion, seaweed extract, chicken manure based organic balanced fertilizer, crab shell, azomite. They are outside without protection in part shade behind banana plants. I potted them up from cuttings a little over six weeks ago and many are pushing growth. I keep them watered but not really saturated using mostly well water and some rain. The mix is pretty well drained but the biochar acts like a wetting agent and holds some moisture without being mucky. I pick up the pots and if they feel lite I will water. If I can feel the weight of moisture I leave them alone. Dragon fruit like fertile soil as far as my experience goes.