depending of how much time you have, doing a simeple sketch, i do it by hand. I’m an hand drawn person, but at work some time you don’t have enogh time to create a rendering by hand. In my case, i create a sketchup model, you don’t need to create the whole thing. So, I pick my views, apply styles, open it in photoshop, in general I draw the vegetation by hands, and place on top, clean it in photoshop, either print out in black and white or render in photoshop. Check my drawings i let me know what you think.
good luck.