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A bluff is a Canadian English term used on the Canadian Prairies to indicate a clump of trees on the prairies, usually poplars or willows. A bluff is naturally occurring, not cultivated.
A bluff of trees normally occurs on the flat lands. "Bluff" in this sense is different from the geographical term "bluff", meaning a cliff.
References
"bluff", Canadian Oxford Dictionary 2nd ed., (Toronto: Oxford University Press, 2004).
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