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I've had my Persicaria affinis (Dwarf fleeceflower) for a few years now and it has to be one of the most carefree plants I have. Needs next to no work to keep it looking tidy and while it can spread it is so easy to control I've kept my clump about a foot wide for 5 or so years with no problems. I grow this fairly dry but being a Persicaria I'm sure it wouldn't mind a little bit of extra water either.
It will now flower pretty well throughout the rest of the summer.
Happy Victoria Day long weekend!