Nature plug-ins

[Maven]

This seems like the best software to me

http://www.bionatics.com/Site/product/index.php3?langue=&UrlSuite=%2Fhome%2Findexc.php3&langue=&Res=1&Height=1024

[Weider]

Speedtree by Digimation

Forest Pack pro by Itoo Software

If you didn't try it, AEC foliage in 3d max 6 or 7.

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