Answer: The most effective solution would probably be an irrigation system with a seven day timer. There are many types of systems available in a wide variety of price ranges and many provide good instructions for do-it-yourself installation. Another possibility would be to set the pots on capillary matting set in trays of water. Depending on evaporation rates, someone might need to top up the trays, but it would be a lot easier than watering the individual plants.
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