Ligustrum Decline: Freeze Damage, Sooty Mold, and Recovery

Diagnosing the Symptoms

A 20-year-old ligustrum with vertical bark cracks, dead limbs, and a non-rubbing black base area suggests two issues:

• Freeze damage: Hard freezes cause bark to split and crack as water in tissues expands.
• Sooty mold: Black coating from honeydew of past insect infestations (scale, aphids).

Recovery Steps

• Prune dead wood back to live tissue (green under bark).
• Apply Atomic Grow (organic systemic) to suppress mold, stimulate growth, and deter insects.
• Fertilize lightly with balanced fertilizer in spring.
• Ensure drainage—ligustrums hate wet feet.

Preventing Future Freeze Injury

• Mulch root zone heavily in fall.
• Water deeply before hard freezes.
• Avoid late-season fertilization that promotes tender growth.

When to Replace

If >50% canopy is dead or main trunk is girdled by cracks, replacement may be best. Ligustrums are fast-growing and responsive to rejuvenation pruning.