We've had reports that Forestry trees aren't generating in RTG worlds.

I'm pretty sure that Forestry trees don't naturally generate in the world. They can only be grown from Forestry saplings for which there are mechanics to acquire them (eg: bee pollination), though I could be wrong. However, from a quick glance at the source, I did not see a tree generator.

Perhaps, @mezz can enlighten us.

That's correct, Forestry trees don't naturally generate in the world.

Thanks for the insight @mezz - much appreciated.