When you re-pot the bonsai you need to trim the roots. It is crucial to help keep the roots and top of the tree in balance. You should only ferterlize during the normal growing season.

Re-potting

Re-potting is a critical element of bonsai care. The height of the pot should be roughly the same as the diameter of the trunk. Different trees will need various ratios of grit to humus.

Outdoor bonsai should be positioned where they will get six or more hours of light each day. Different tree types will require different amounts of water to thrive. Along with normal watering about once a week you should fully submerge the bonsai tree pot until no more bubbles escape from the pot or the soil.

Soil
Proper soil choice is critical optimum bonsai tree care, the soil affects the roots, feeding, and watering of your tree. The soil used to raise bonsai is normally a porous soil that drains well.</p>
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Lighting

Many people do not realize that most bonsai trees should be kept outdoors year round. pay special attention to developing the trunk, any where on the trunk that a branch is allowed to grow will thicken. You need to trim all away around the ball to keep it in balance. Us a water soluble ferterlizer and apply it when the soil is already wet. When pruning you need to keep the top and bottom (roots) balanced for optimum results. You will need to research your specific species of tree for a general guideline and then closely monitor how the tree grows to determine if it is being watered correctly. If you take your pot and place it on top of some rocks in a tray full of water this will help increase the humidity around the tree linsheng and will aid in it's growth. Usually dedidious trees need about 70% humus and 30% grit while evergreens will thrive better with 30% humus and 70% grit.

Pruning

Pruning serves dual purpos in the care of bonsai trees. Bonsai soils are designed to optimize drainage. You should start with a light pruning then give it two or three weeks and wait for the bounce back to decide if you need to do more. Pruning removes branches that clutter and hamper the aestetic design of the tree. As a rule of thumb be about 3/4 as wide as the tree is tall and about half as deep. The size and shape of the pot affects both the appearance as well as growth and health of the bonsai.

Watering

More trees die from a lack of water or low humidity than anything. Bonsai trees should be re-potted every two or three years. You will also have fine pruning sucha s pinching and leaf pruning to help encourage branching.Bonsai trees need care similar to any other plant below is a basic outline of care for a Bonsai tree. The few exceptions are the non-traditional tropical trees which need kept inside if you are not in a tropical environment.

Indoor bonsai should receive two to four hours of natural or artificial sunlight. The type of soil as well as the shape and design of the pot will affect quickly the soil dries out. Pruning is
also used to direct and control the growth of the tree. So if in doubt leave it for now.

Fertilizing

Your average bonsai will need fertilized once or twice a month. Always remember when you are pruning your bonsai that you can always remove something later but it is very difficult to put it back after you have cut it. You will normally want to remove about 1/3 of the root ball. They are usually a mix of coarse sand or gravel with peat or bark added for an organic element. For inside bonsai full spectrum flourescents can provide the necessary light levels but the treen needs to be placed close to the light.