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Chain-link structure or maybe track/hardware from barn door

Grow Squash, Cucumbers and Melons Vertically

Plant lemon seeds. Lemon leaves smell so good.

Eaves trough garden via Container Gardening Options for Small Spaces (Slideshow) : TreeHugger I think this is brilliant. Not necessarily the cheapest solution (Unless you are fortunate enough to have some laying around or salvage some.) to minimal square footage but it is both and awesome solution and awesome to look at. Photo credit: keeping it real @ Flickr

Ten Vegetables You Can Grow in Shade...and remember, no pesticides

Great idea! The next time you have green onions, don't throw away the white ends. Simply submerge them in a glass of water and place them in a sunny window. Your onions will begin to grow almost immediately and can be harvested almost indefinitely. We just use kitchen scissors to cut what we need for meals. I periodically empty out the water, rinse the roots off and give them fresh water.

Never Pay For Onions Again: Grow Them Indoors! This page has all sorts of interesting ideas for growing plants indoors.