Uuuuuuh...Hmmmmm. Oops - Tree 13 is a bit unlucky. Its just too big for V1! Tried placing a few in a town which Im building as an 'aiport' in AptCndrX (to use all my new found light tricks) and Condor "failed to create vertex buffer". Its just too many vertices for the buffer size allocation in V1.
I'll make a simpler version and post it up soon.
Aside ffrom that setback the method above is the way forward with trees. Using spheres means there are no edges of image planes visible which always look terrible. And you get the bulk of the canopy without much trouble. Toooo many V's Chris!