Yes, I use trees. I have a lot on the sections for which I've already built scenery. Unfortunately, I'm not very good at making them. Buying them is expensive, but my best alternative. The area that still needs a lot of trees will be north of the Steubenville railroad station.
Modeling the PRR Panhandle Division c. 1953 Member PRRT&HS, NMRA, TCA
Unless your modeling the Sahara Desert, trees to me are a necessity. They high lite scenes, buildings and roadways on the layout. They also hide shortcomings and like tunnels, trains coming out or around a forest of trees is fantastic. I wish I had more.
I think trees are very important. When I look outside there are trees all over the place. IMHO, a layout without trees just doesn't look right unless it's a western desert layout.
The trees on my layout are from Dept. 56, Lemax, Menards, JTT Scenery and Woodland Scenics tree kits. As I said in another thread I am reworking some of the ready made spring trees with buds rather than summer foliage to make them look better. I bought some of the trees, some were given to me by my old club, and the Menards trees were freebies with a purchase.