Please take a look at my sales gallery here for more photos of trees.
I am fascinated by trees in the urban environment, and I have featured them in both in my minimalist and new topographics photographs. In minimalism, I am normally trying to avoid them because of the unnecessary context or distraction. In urbanscapes they often affect the balance or symmetry I am trying to achieve. However they do occasionally provide a superb contrast to what would otherwise be a very uninteresting wall or landscape.