Answer: You are a thoughtful neighbor! How about if you build a wooden frame, with or without a bottom, and line it with several sheets of thick-mil plastic sheeting? Another alternative is to use a slow-drip watering method that won't flood the pots. There are lots of gadgets available at home centers these days to serve this purpose. I also recommend Burpee's Terra-Sorb, a soil additive that reduces watering chores (see the Burpee website at http://www.burpee.com for more info). Best of luck!
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