Backyard Landscape Design Software
This free program allows its user to plan their garden with a library of over 1200 plant and object symbols. These symbols are able to be customized so that everything fits with the vision you have. If there are symbols that are not matching your needs, you are able to draw your symbol into the design. With the drawing tool you can add paving, paths, walls, pools, fences, ponds, and more. The trial is free, but to have full access to the program you will need to purchase the program. There are no other charges. When you purchase the whole program there are not following monthly fees. The updates are all free as well. There are online videos that help you see how the program is used and screenshots that will also explain the process.
Again, the only issue with this landscape design software is the cost. After the free trial you have to purchase it. It may work for you to complete a single project. The ability to draw objects into the design is very unique as well.