FracTree 1.0 is a program to design and draw fractal trees and other fractal patterns in various stages of growth. Images can be viewed on the screen, saved as bitmaps, or printed out.

This program is based on a string rewriting system, L systems or Lindenmayer systems. You need Microsoft Windows 3.1 (or later) to run this program which is shareware.

(modified from the documentation)  

Look at the readme file from the program.