Any place you can't drain you can use mosquito dunks. It's not just a nuisance issue it's a safety one. West Nile which is common in the northeast can be deadly. And there's been recent domestic transmission of malaria (still rare but)
Learn from the horror I have witnessed! Seeing *squads* of mosquitos zoom out of the bottom of your planter is not for the faint of heart!!

1) clean your outdoor planter base regularly in the summer
2) drain the water from whatever planter base you bring into the house
3) tell your neighbors

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