Princess Flower (Tibouchina) Leaf Drop After Planting

A 5–6 foot Tibouchina urvilleana (princess flower) planted in full sun in New Orleans in late June dropped most leaves but still flowers sporadically. Leaf tips were brown at purchase. Owner asks if this is transplant shock or death.

This is classic sun acclimation shock. Greenhouse-grown plants develop "shade leaves" with chloroplasts arranged for low light. Sudden full-sun exposure burns these leaves; they cannot restructure—they must be replaced by new "sun leaves." The plant sacrifices old foliage to grow adapted foliage.

Care during transition:

• Do not panic or prune heavily.
• Water consistently—keep root ball moist, not soggy.
• Provide temporary 30–50% shade cloth for 2–3 weeks.
• Do not fertilize until new growth emerges.
• Expect new leaves in 3–4 weeks; full canopy in 6–8 weeks.

Note: Tibouchina urvilleana is listed as a noxious weed in Hawaii due to invasive potential. In Louisiana, it's a beautiful perennial but may self-seed.