@Michael_Bridges Just out of curiosity, in your experience how many tris is too many? For lecture 160 I decided that I would just completely make the bushes in a separate blender file and then append them into the rabbit scene. I was able to get a quite satisfying bush within just a few minutes but I think I may have gone a bit wild
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Interesting question.
In short there isn’t really too many, unless your computer keels over 
Really though it depends what you are rendering and the final output and you make judgement from there.
Remember a lot of the modifiers esp sub surface division are there to enable to work at a lower poly count and then output at a much higher count if necessary.