I went back to the monthly market, Owl, and bought 20 more durian saplings, now only 80 baht each, plus a mixture of grapefruit, mangosteen and rambutan saplings.
Come next month or November, I'm going to need some black cloth to protect the saplings from the increasingly harsh sun. Not sure what percentage to get.
One shop was selling cloth with 80% protection but that seemed too high, could stunt growth I reckon