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Window Boxes - Charming and very practical

What you can do with a window box is only limited by your imagination (Unless, of course, you have an unlimited imagination). Window boxes can be made of copper (tres chic!) or other metals, wood (redwood or cedar being the most durable), or plastic. They can be simple boxes, totally unadorned, or you can stencil them, glue on wooden appliques, or add little pickets to give the look of a tiny fence.
A popular window box style for colonial houses is the hayrack style. You've probably seen pictures of these attached to the windows of European houses. Since they are open structured, things are likely to plop right out of them unless you line them with sphagnum moss and use pots to hold the plants. Other than hayracks, window boxes tend to be enclosed containers.
If your window box is too beautiful to endanger, then use it as a holder for multiple small pots of plants. But if it's sturdy and practical, make sure you have drainage holes in the bottom and some wire mesh to keep in the potting mix, and treat it as a miniature garden.
The key to a really good-looking window box is proportion. A good rule of thumb is to make them 25% of the height of a short window and 20% the height of a tall one. Too skimpy and they'll look like badly applied false eyelashes.
Check out the Windowboxes section for a wide selection.