As stated above, try using only a few mesh2 trees as templates and place 
copies of it in a more or less random fashion.
There is another jave tool called PovTree (original derived fron Tom 
Aust's famous tree includes)
    http://propro.ru/go/Wshop/povtree/povtree.html

A typical workflow I could think of looks as follows:
- create a few trees
- create a hightfield which serve your needs
- create a (later non vivsible) pigment (eg. by bitmap) for the hightfield
   - the color channels in this pigment can be used as information for 
density of the trees, which tree to place, scaling or what ever you like
- write a macro which traces the heightfield in an random fashion
   - for a given point on the heightfield eval_pigment and use the 
colors to decide if to place a tree, scale or what ever you can imagine of

you should end up with the crude geometrical setup for your scene, which 
is normaly the easiest part. The realy hard thing IMO is to find a nice 
view, setup lightning, texture the whole stuff and add some eye-candy, 
which takes much longer.

... dave

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