Answer: Japanese andromeda or Pieris japonica is a broadleafed evergreen that should be hardy into zone 6 or so depending on cultivar. I am not finding any references to a cultivar of this plant called King of Hearts, so I hope this is the overall plant you are writing about. Your zone based on your zip code would be substantially colder, 5B. Depending on your microclimate it could be a bit warmer (in a sheltered urban location) or a bit colder if you are in an exposed, cold and windy rural location. It may be that your plants are simply suffering winter stress due to cold and/or excessive wind exposure. New plants are more susceptible to this than older well established and well rooted plants. However, I would suggest you consult with the nursery staff where you purchased the plants and/or with your county extension to see if the discoloration is due to winter or if there is some other cause such as poorly drained soil or even pest or disease damage and based on that, decide how to proceed. I'm sorry you are having trouble with your plants.
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