Without microbes or fungi, plants are mostly left to either chemical weathering from water or turning carnivorous (which takes a really really long time). Aero

Without microbes or fungi, plants are mostly left to either chemical weathering from water or turning carnivorous (which takes a really really long time). Aeroponics has the added benefit of being really frugal with your water supply. Most of the water in a hydroponic system is literally just sitting around in a tube, useless. Also, a leak in an aeroponics system is way less catastrophic in a low-to-no gravity situation. I think using moon dust as a rooting medium would be helpful for water retention in a pseudo-hydroponic setup, as the surface tension would help keep the water from flowing away from the roots. It certainly beats trying to ship the stuff from earth on a rocket, at the very least.