Lowe's has a free online application that let's you organize your plantings and print out your results.
You must register at lowes.com. Then go to the top of Lowe's home page, select How-to, then Interactive Design Tools from the drop-down menu.
Under Outdoors, choose Lowe's Garden Planner and launch it.
A tutorial breaks down how to use the application's tools, choosing the right plants and other stuff.
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