18-Year-Old Orange Tree Sudden Leaf Drop: Root or Light Issue

No Environmental Change? Check Roots

If light, temp, pot, and routine are unchanged, suspect watering-related root problem. Unpot next watering time: top ¼ soil should be dry, bottom damp. Roots firm and wiry = good. Dry throughout = underwatering. Wet with soft roots = root rot.

Light Matters

Citrus needs max direct sun. East window gives only morning sun—may be insufficient, leading to slow growth and easy overwatering.

Inspect roots; adjust watering and light accordingly.