One Window Box, Three Ways
The Basic Box
Begin building the boxes by creating the basic box shown below.

You can make your starter box almost any size. If you will be using insert trays, be sure the dimensions are large enough to accommodate the tray completely.
In general, 1x10 lumber works well for most boxes. Follow the diagram shown. The inside corner blocks are cut from 3/4-inch square stock.
Assemble the box with glue and deck screws. Then drill a dozen or so holes in the bottom for drainage.
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