fertilizer burn on Calathea
Quick answer
If your Calathea has fertilizer burn, the most likely cause is: Calathea are extremely sensitive to fertilizer salts that accumulate in soil and cause osmotic stress, burning roots and leaf tips. Excess nitrogen causes rapid but weak growth susceptible to pests and disease. Salt buildup appears as white crust on soil surface and progresses to brown leaf tips. Unlike nutrient deficiency (uniform yellowing), burn affects newest growth first or appears as marginal necrosis. Water quality compounds the issue - hard water plus fertilizer creates dangerous mineral loads.
Start here:
- 1. Flush soil immediately with 3x pot volume of distilled water
- 2. Stop all fertilizing for 8-12 weeks
Why Calathea gets fertilizer burn
Goeppertia spp.
Calathea are extremely sensitive to fertilizer salts that accumulate in soil and cause osmotic stress, burning roots and leaf tips. Excess nitrogen causes rapid but weak growth susceptible to pests and disease. Salt buildup appears as white crust on soil surface and progresses to brown leaf tips. Unlike nutrient deficiency (uniform yellowing), burn affects newest growth first or appears as marginal necrosis. Water quality compounds the issue - hard water plus fertilizer creates dangerous mineral loads.
Other documented causes on calathea:
- • Fertilizer burn occurs when Calatheas receive excessive nutrients or when salts accumulate in soil from over-fertilization or hard tap water. Calatheas are sensitive to chemical fertilizers due to their tropical understory origins where nutrients are sparse but consistent. Salt buildup creates osmotic stress, drawing water from roots and causing leaf tip burn, crispy margins, and stunted growth. Symptoms appear 1-2 weeks after fertilizing or gradually with chronic salt accumulation.
How to reverse fertilizer burn on Calathea
- 1
Flush soil immediately with 3x pot volume of distilled water
- 2
Stop all fertilizing for 8-12 weeks
- 3
Trim affected leaf tips with sterile scissors
- 4
Repot in fresh soil if white salt crust visible
- 5
Resume feeding at 1/4 strength diluted fertilizer only during active growth
Keep fertilizer burn off this Calathea
Use 1/4 strength balanced fertilizer monthly during spring-summer only. Never fertilize stressed or newly repotted plants. Flush soil every 2 months with distilled water to prevent salt accumulation.