Tibouchina Decline: Container Size and Watering Issues

New Tibouchina in sunny location loses all flowers first week, now yellowing leaves despite moist soil.

Diagnosis

Yellow leaves usually indicate underwatering. Container may be too small—root-bound plants can't absorb enough water. Empty saucer within 15 minutes. Grandiflora variety has opposite needs.

Action

Repot to larger container if root-bound. Ensure thorough watering with drainage. Tibouchinas are finicky—water is usually key.