whats already been said is correct, but as far as humidity trays go, ive been told not to use them. they encourage the growth of a central taproot. instead i mist my fukien once or twice a day with a simple mister. if you get a mister, however, make sure that it isnt for chemicals or anything harmful. also, once misted, don't put the tree in the sun or artificial light-the leavves will scorch!!!