Research > Reference Library > Trees of Canada JOIN MAIL LIST: SEARCH: Discover GF Research Education Newsroom How to Help click image to enlarge Hackberry hackberryCeltis occidentalis L. Some hackberry trees can reach heights of more than 25 m but on average they grow to about 16 m. They closely resemble elms but they have round fleshy drupes as fruits instead of samaras. The fruits are eaten by a wide variety of birds ranging from game- to song-birds.
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