Magnolia Bloom Failure and Trunk Lichens: Nutrition & Cosmetics

Why Your Magnolia Isn’t Flowering Well

Excess nitrogen (from lawn fertilizer) promotes leaves over flowers. Your tree needs phosphorus and micronutrients to shift energy to blooms.

Scatter 1 lb 10‑10‑10 per inch trunk diameter every 4 weeks in spring (3 applications).
Add superphosphate (0‑20‑0) per label.
Or use Espoma Holly‑tone (acidifying, with micros) in fall and spring.

Magnolias are evergreen but shed old leaves in spring/early summer as new growth emerges. This is not a disease.

Symbiotic algae+fungi; epiphytic (not parasitic).
Indicate good air quality and thin canopy.
No treatment needed; denser canopy (from better nutrition) will naturally shade them out.

Trees: Lichens on Trees: Harmless Indicators of Stress, Not Disease; Old Magnolia with Dead Limbs and Papery Growth: Lichens; Magnolia Tree Yellowing After Yard Renovation: Root Damage Suspected; Lichens on Weeping Cherry: Harmless Indicators of Thin Canopy; Magnolia Bark Splits: Normal Sloughing, No Treatment; Lichens on Trees: Harmless Epiphytes or Hidden Threat?; Gray Fungus on Large Trees: Lichens, Not a Disease; Magnolia Scale on Historic Tree: Systemic Treatment; Cottony Scale on Magnolia: Not Fungus, But Insect Infestation; Lichen on Orange Tree: Symptom, Not Cause

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