Identifying Bark Nubs on a Jasmine Tree in South Florida

A South Florida gardener notices nubs on a jasmine tree that has stopped blooming and producing new growth for three months. Photos show small bumps on the bark.

Likely Benign: Lichens

The nubs are most likely lichens—a symbiotic organism of fungus and algae that grows on bark. They are not parasitic and do not harm the plant. Their presence often indicates good air quality.

Real Culprits: Water and Nutrition

The lack of blooms and growth points to cultural issues:

• Underwatering: Jasmine needs consistent moisture, especially in hot climates.
• Nutrient deficiency: A balanced fertilizer can stimulate flowering and new growth.

Action Plan

1. Increase watering frequency; ensure soil stays evenly moist but not soggy.
2. Apply a slow-release fertilizer formulated for flowering shrubs.
3. Ignore the lichens—they're harmless.

Resources: Jasmine Plant Care Guide.