Oakleaf Hydrangea Root Rot: Armillaria Strikes After Overwatering

Rapid wilting and death of ‘Snowflake’ oakleaf hydrangea in well-watered soil suggests Armillaria root rot. The fungus thrives in excess moisture. No fungicide cures it.

Recovery Steps

• Remove dead plants and roots.
• Amend soil heavily with mini pine bark nuggets for drainage.
• Replant in fall with new ‘Snowflake’ or resistant varieties.
• Water only when soil is dry 2 inches deep.

“Love them to death” with a hose is a common cause.

Oakleaf hydrangea killed by Armillaria root rot.

Healthy ‘Snowflake’ in well-drained soil.