The photo shows wet soil and a visible drainage pipe near the dead male holly. The most likely cause is waterlogging from the drain—the roots are suffocating in saturated, anaerobic soil.
Dig a small hole in the root zone of the declining bush. If the soil is soupy or smells sour, you’ve confirmed the problem. Redirect the drain, improve grading, or install a French drain to move water away from the root zone.
The female bush showing yellow leaves may be in the early stages of the same issue—act now to save it.
Variegated Holly Losing Lower Leaves: Scale and Chlorotic Shoots
Diagnosing Holly Leaf Spots and Pruning Guidelines
Holly Bush Sooty Mold and Scale/Aphid Infestation
Self‑Fertile Holly No Berries: Weather Stress or Thrips?
Holly Bush Winter Burn: Pruning, Watering, and Anti-Desiccant Prep
Black Sooty Mold on Holly: Control the Sucking Insects First
Identifying and Managing Powdery Mildew on Holly Bushes
Sooty Mold and Scale on Holly: A Two-Step Treatment Plan
Treating Scale Insects on Holly Bushes
Holly Aphids: Why They Don't Spread to All Plants
Reviving a 'New Dawn' Climber After Mysterious Summer Collapse
Copyright © www.100flowers.win Botanic Garden All Rights Reserved