Originally Posted by Laidoffsick:
Trees are even more expensive than figures, but it's all the little details that make the difference. So while we all have thousands invested in our trains, we will also have thousands invested in the little stuff. ..
I agree with you. Trees, along with appropriate undergrowth, is one facet of model railroading that I have found myself uncompromising about for my own layout as well as for the work I sell to customers. If we are aiming for a shot at realism, sometimes one has to bite-the-bullet and pour on the cash for the foliage, particularly the trees. And, IMHO, a wide variety of heights(agreeing with you here, Lee) is entirely appropriate, as is variety in genus, colors, and textures, in any one particular scene or for an entire layout.
From my perspective, sticking one lone bristle-brush tree by its lonesome amidst a huge expanse of barren acreage is not worth the effort or mini-expense, unless one is going for the look of a parched, lonely landscape. However, taking that one tree (not that there aren't lone souls standing by themselves in reality, of course) and combining it with others, plus low-foliage, is a far more effective use of available funds, effort, and trees.
This is just my personal opinion. Trees are one area where I do not skimp, so I am prepared to spend the money. They make all the difference.
The foliage/trees in all of the scenes which I have shared, here, were purchased from Jim Elster's Scenic Express, and I have considered them to be a good value for a good price.