It may be due to poor drainage or soggy soil conditions. If there was a herbicide used around the plants (such as is in some weed and feed fertilizers) this can also cause similar symptoms. I suggest you dig down a few inches and see how moist the soil is. Allow it to dry out a bit between waterings. As for herbicide injury, time is the best solution. With a minor bit of damage the plant should recover fine in the upcoming months.
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