Very simple and easy... bottom water (you should be doing this anyway).
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1. Make several holes in the bottom of the grow containers
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2. Go get some kind of low-profile reservoir pan you can use to hold water. At the young age of your plants, you can probably use a cake pan. You can get aluminum cake pans at your local grocer for just a few bucks each, and you can probably set 8-16 plants in each
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3. Set the pierced grow containers in the reservoir pan and put a few inches of water in the bottom. Set your plants in the pan. The holes in the bottom of the grow containers will allow the standing water to wick-up through the soil as needed and water them in a manner that is probably more effective than if you had been watering them manually
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4. Go on vacation, get laid, drink some beers, enjoy yourself, and return home safely to enjoy your healthy, thriving plants.