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Saw something like this @ Home Depot. All you need are the pots and a metal rod to hold the pots together.
Look! Terraced Herb Garden
We love the geometry and repetition of a terraced garden, and this little set-up (not pictured above), from the home of Susann Larsson of Purple Area, is an ingenious way to bring the look to your small-space deck or balcony garden. It works perfectly for herbs, which will stay small with constant harvesting… Susann’s lovely little garden benefits from the uniformity of the galvanized steel pots.
Cleaver use of a broken pot in a succulent bed by Patty Connole.
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20 great Herb Garden Ideas