Lagless/low lag trees and other?

[Minxy]

Heyness, so, I'm making a pretty large map, and there's going to be quite a few trees and things in there.
I was wondering, is there any realistic meshes out there, suitable for a Wolf park/forest, that are low in the lag factor, or do not lag at all? Really hoping there is. There isn't a particular season that i've given for the map, however it is certainly not a winter map. xD Though, i'd really appreciate if someone did reply back to me.~ (Also, does anyone have grass that moves? Would be awesome to have. xD)
Thank you in advance, to anyone that does reply. xD
-Minxy.~

[Ingredient]

Here's some fir trees from IT: http://rasmirasim.deviantart.com/art/IT-Fir-Trees-327283347

There's also this birch tree: http://www.mediafire.com/?uvt409zv23alkyt

I'll keep looking for some more

[Minxy]

I love that birch! This is very much appreciated! Thanksness for the tree.~

[Ingredient]

You're very welcome Have fun!