Black olive is a 40 to 50-foot-tall evergreen tree with a smooth trunk holding up strong, wind-resistant branches, forming a pyramidal shape when young but developing a very dense, full, oval to rounded crown with age. Sometimes the top of the crown will flatten with age, and the tree grows horizontally. The dark bluish-green, leathery leaves are two to four inches long and clustered at branch tips mixed with the 0.5 to 1.5-inch-long spines found along the branches.
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