Watering bonsai is a science all to itself. There are so many factors. Soil mix in the container, the
type of container each bonsai is in, the orientation of the bonsai to the sun and shade, the plant type,
wind, lack of wind, geographical location, season of the year, etc. That's why everyones watering situation is different. I live in Wisconsin, grow a variety of different plants in slightly different soil mixes, sometimes the wind in howling out of the North, West, or South.
Sping is easy for me. Once a day for everything that needs it. Summer is different. All the trees get morning sun and then half the benches are shaded by a big old Sugar Maple from 2:00-5:00 PM. I locate my maples on the shady side of the bench and the conifers on the Sunny side. If it's windy that dries them out quicker. Right now I water what's needed in the morning and then check them at lunch time, especially on windy, hot, sunny days. I also check them in the evening and usually soak them down or soak the ones that need it. I also have a misting nozzle that is indispensible. I mist them til they are glistening with little balls of water. Keeps the mites at bay.
There are no easy answers when it comes to watering bonsai.
DRAM misting fogger
