The leaf system of the plant also takes in air through their pores. The root system is a bit like our lungs, all plants breath through their root system. They need also to be placed where rain can fall on them, although you must not leave Bonsai Tree wet or waterlogged for long periods. Water the entire plant and soil daily; dont skip a single day as this can permanently bonsai tree for sale damage the plant. If this area is subject to drying winds then place a screen around your plants to protect them, this will also provide shade. Spring is also the time for any training and pruning of your last season Bonsai Tree. Always make sure you start your tree in spring as the plant will then have a full growing season to adjust to the changes.