Caw FAQ's........Links to Tutorials, and Resources. Textures, & Troubleshooting

If you can click on the tree to select it, then you can use your delete key again. Since it's on the road, sometimes it wont let you select it, it just selects the road. This is what you do. Go to the top left options menu, click on "View" then on "Tree names". Find the number, then the same number in the layer your trees are in, under "objects". Right click on it, and delete.

Hope that makes sense. :D