I should have posted all of these long ago. Here's a bunch of tree models from my earlier courses and some recent textures.
The Hobson and Riviera packages have a lot of stuff in them and it may be best to open them in a practice project, pick through what you want and discard the rest.
I was experimenting with low poly models back then so some of the trees may not be the prettiest things out there!
Riviera has some nice trees and bushes though.
Hobson House Foliage:
South Darby Textures:
I have developed a foliage set for Colonial CC and will post it later when the course is ready.