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Repotting
The purpose of repotting is to maintain the vigor of the tree. As soil is watered and roots grow, the soil will become compacted and drainage will be impaired. Also, the root system will continue to grow and expand within the limits of the container. Repotting allows us to trim the roots and encourage the growth of feeder roots, making for a healthier root system and tree. Repotting is considered an activity requiring intermediate skill. It can be learned or self-taught from a book or article, but firsthand experience is hard to beat.
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Watering
Watering is said to be one of the most difficult skills to learn. Most of the problems that beginning bonsai fanciers have can usually be attributed to watering problems.
Considering all of the variables at work, this is not surprising. In addition to the variables of tree species, container size and soil composition, we should consider the timing of watering, the amount of water applied, the frequency of water, and the seasonal variables of temperature, wind and relative humidity.
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Thinning
The general strategy for thinning growth is to reduce each bud to just two leaves. The leaves should be healthy.
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