Growing on You - Zen Garden Bonsai Blog
Do you want to know how often to water your bonsai? There is only one honest answer and that's "When it needs more water", and depends on many factors. How big is the pot? What kind of tree? What time of year? Where is it placed? How big is it? What type of soil is it in?
Watering is the most difficult part of bonsai care. You can kill your bonsai by over watering or under watering. The only difference in the end is that generally, under watering will kill them faster.