I made this cheap, practical system for starting pepper seeds. It could be adapted to growing larger plants as well, just by closing off some of the holes. It functions similarly to most AeroGarden models, and uses the same pod baskets. It has 16 grow sites. Total cost, including the pump and light is less than 30.00.
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https://youtu.be/VfbM8LRiINY
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https://youtu.be/VfbM8LRiINY