This great idea is similar to how I want to make my greenhouse shelving. I would like to be able to have a metal trough of some sort underneath and have all my seedling/plants sitting down into it at all times with the water level controlled by a float valve (I think that would work?) so I could keep the water line on at all times. This would eliminate one of the biggest time sinks for me in growing plants and make it much easier to fertilize everything at once not to mention I could leave town and not need to worry.
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