Design software for Permaculture Projects

I want a piece of software that will allow the user to draw out a landscape design using Permaculture Design Principles. It should be simple to use for the person that is "Drawing/design" impaired, use standard type interfaces with drag and drop for different design features. It should have a simple, less expensive version with just basic design capabilities and a fuller version with extra features, such as a catalog of plants, and maybe a 3-d view.