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I didn't get rain gutters to use for seed sprouting under grow lights. Instead I used metal deck legs for an old pool. they are hollow and have only 3 sides. Perfect for this. All they need is a liner. I finished one this evening and planted a little catnip on one end with the rest being planted with common plantain (Plantago major). I can't wait for those greens to pop up so I can chow down on them. I'll get the other 3 planters put together, planted, and hang the lights above them later.