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Last week I purchased a Chrysanthemum and planted it in a pot in my garden
It gets plenty of sunlight and I make sure to water it abundantly two or three times a week. And, even though it's summer over here right now, temperatures aren't very high and so it isn't exposed to anything above ~28°C.
Problem is, its leaves have started to noticeably weaken and decay. Usually they spring somewhat beck to normal when it's nighttime. I'm only getting started on gardening as a hobby, so I have no idea what it could be or if it's abnormal in the first place