Here is a rendering of the backyard garden I did recently to visualize how a garden might look a few years from now. It helped me identify the look I want and convey it to the landscaping contractor who does the planting. You do not need any special software. Microsoft Paint or similar software will do.
It was a bit like a prototyping a product at work. You start with a rough hypothesis and make something. While you make it, you understand the product better, learn new things and get new ideas. Because your ideas have a tangible form, others can give meaningful feedback and the idea gets better. Your chances of success increases significantly. So Prototype your idea. Make something.
|The bare backyard.|
|The idea for a part sun garden|