Your symptoms—half of adjacent plants dead, other halves healthy, spreading slowly—are classic English boxwood decline, a complex disease with no cure.
Do not replant English boxwood in the same spot.
Southern Magnolia Excessive Leaf Drop: Check for Root Stress
Boxwood Decline: Yellow Powder Is Likely Pollen, But Check for Root Rot Fungus
Japanese Crimson Maple Failure to Leaf Out: Diagnostic Checklist
Saving a Yucca Damaged by Unnecessary Repotting
Intensia Phlox Hanging Basket Declining: Water Twice Daily in Heat
Tomato Plants Dying from Bottom Up: Fusarium/Verticillium Wilt
Golden Orfe Deaths in a Large Pond: Oxygen Depletion Under Ice Suspected
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