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you could probably also get away with a phrase like "look at all this cactus" or "this hill is full of cactus"

I'm not sure if it's correct, but it sounds correct.

That is correct, at least descriptively. For instance, I will routinely hear this like "There's a lot of sequoia up North" or "That forest is now full of eucalyptus".

That is how most of my friends use the word "cactus" in Arizona.

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