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Temperate plants, those native to regions with four distinct seasons, may naturally drop their foliage in autumn. Examples include bald cypress or maple. Evergreen trees, from temperate
http://www.ehow.com/facts_7738328_do-fall-off-bons...
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Sticky falling leaves are almost always caused by aphids or scales. Aphids are small insects that live on the undersides of many ornamental plants, including bonsai. They may be brown
http://www.ehow.com/info_8655215_leaves-sticky-fal...
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Leave plays important role of Photosynthesis for a plant. When a leave becomes old, its capacity to make food gets lowered. So old leaves fall off trees.
http://answers.ask.com/Science/Other/why_do_leaves...
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1. Sketch the shape you want to attain with the bonsai. Having a mental picture of the desired shape will be a guide of how to trim. Some bonsais are distinctly shaped, such as in
http://www.ehow.com/how_8274935_trim-leaves-bonsai...
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