Attached Link: http://www.guitta.net/tutorials/scan.html

You only need 1 or 2 of leaves. Then have a look at my tutorial. First it shows you to create plants. At the and of the tutorial, it shows you how you have to behave for trees.

See also the following tutorial.
http://www.guitta.net/tutorials/branch.html

In this one, insteed of taking off branches, render your image in high resolution; After that you can replace the leaves in a paint program with your own leaves. Save the finished file as myleaves.jpg (or something like that). In Vue, create a tree, open the Material summary, search the leaves of the tree you have just opened. Click LOAD MATERIAL and select your leaves.

Read carefully both tutorials to understand.

Guitta