Daylilies Not Blooming: Crown Rot, Late Freeze, or Herbicide Drift?

Established daylilies (5 years, regularly divided) fail to bloom this year; centers yellow and unhealthy. Some near hollyhocks, some not. Preen and Roundup used nearby historically without issue.

Possible Causes

• Crown rot: Wet conditions promote fungal rot at base.
• Late spring freeze: Damaged buds reduce blooming nationally this year.
• Roundup drift: Even careful application can volatilize or drift, damaging non-target plants.
• Overcrowding: Despite division, some clumps may be too dense.

Diagnosis Steps

1. Check crowns for mushiness, foul odor (rot).
2. Recall weather—was there a late hard freeze?
3. Review Roundup application dates and conditions.

Remediation

• Improve drainage, avoid overhead watering.
• Divide congested clumps in fall.
• If herbicide damage suspected, water deeply to leach soil, wait for recovery.

Daylilies are tough; address the stressor and they'll return.