Bonsai trees can be also naturally collected trees that grow freely in the living nature. This particular type is extremely rare.
Are Bonsai Trees Expensive to Grow? - Hooked on Bonsai
Chinese Banyan - *Wigert's Specimen Tree* - Wigert's Bonsai
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What Makes Bonsai Trees So Expensive?
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What Makes Bonsai Trees So Expensive?
Why are Bonsai trees worth so much? - Quora
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Are Bonsai Trees Expensive to Grow? - Hooked on Bonsai
Bonsai - Wikipedia