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Tree cholla (Opuntia imbricata).

Cholla is a term applied to various shrubby cacti of the genus Opuntia with cylindrical stems composed of segmented joints. Tree Cholla can be planted in zones 5 thru 11 and are adaptive to any well drained coarse soil type.

If you want more information about this flower, just search the plant's Latin name on Google:

Tree cholla

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tree cholla