I'm looking for advice on upright yews. We planted 6 of them late last fall. Other than watering them good after initial planting and mulching them we didn't do anything. We've resumed watering them this spring but I noticed they each have some degree of leaf discoloration, yellowish or rusty in color. Is this normal after winter? Are they dying? Should I be doing something - fertilizing perhaps? Could the discoloration be caused by too little or too much water? They are buffered from wind by our neighbors garage so I know that isn't the cause. A friend suggested muriatic acid. That doesn't sound right to me. Any advice is appreciated. Thanks, Jennie