Answer: If one is happy and the other is not, I would suspect a water stress problem with the sickly plant. Junipers need one or two deep soakings per week in hot weather, but they also need soil that drains well. If the soil remains soggy wet, the roots can suffocate. I'd dig around the sickly one to make sure the roots are getting enough water but that the soil drains well after watering. You can probe down into the soil to test. While you are there, look at the roots. Healthy roots will be creamy white inside; dead or diseased roots will be brown or rusty colored. Hope this information helps you determine just what might be wrong with your juniper.
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