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ask your irrigation supply house to find you a bag of Roberts spot spitters, then run a drip lateral on top of the ground between two rows of pots, with a drip tube to each pot. the Spot spitter goes on the end, sticking in the pot, one end of this nifty little invention is to spray waterr. pull it out, turn it over and re-insert into the tube and it plugs the drip tube when you remove the pot.
A very slick system, on a valve and timer of course.
Good luck.
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