Answer: There are several types of Oxalis grown as houseplants and commonly called shamrock, the purple leafed variety would match your description very well. These plants do well in a bright location with an evenly moist (but not sopping wet) soil when they are actively growing. Eventually, they begin to fade and die back at which point they need to be given a rest by keeping the soil dry for about a month or so. Then water it again and it should resume growth. (So maybe your plant was just naturally beginning to go dormant.) Good luck with your plant!
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