Can we use fluvo-aquic soil for downhill piles without watering?

Of course. Downhill piles refer to bonsai piles excavated from wild forests with their roots and stems severely cut off. It is ok to use fluvo-aquic soil for downhill piles without watering, because many bonsai materials are in deep forests or wild valleys, because it is customary to call non-artificially cultivated piles downhill piles. Bare piles refer to green piles or downhill piles without soil balls and bare roots. Because many tree species are on the cliff, it is difficult to take the soil ball down the mountain, such as golden cypress. Or tree species have strong adaptability and do not need to bring soil balls down the mountain.