Troubleshooting Brown Leaf Tips on a Mystery Houseplant

A reader describes a plant with long green leaves, red undersides, and multiple stems—possibly a Calathea, Stromanthe, or Maranta (prayer plant). The symptoms: brown leaf tips, yellowing leaves, weekly watering, biweekly feeding.

Most Likely Causes

• Overwatering / poor drainage: If the soil stays wet too long, roots suffocate. Let the top inch dry before watering; ensure the pot has drainage holes.
• Low humidity: These tropical plants need 50%+ humidity. Dry air causes brown, crispy tips. Use a humidifier, pebble tray, or group plants together.
• Fertilizer buildup: Feeding every two weeks can accumulate salts. Flush the soil monthly with plain water; reduce feeding to monthly at half strength.
• Water quality: Tap water with fluoride, chlorine, or softener salts damages sensitive leaves. Use filtered or distilled water.
• Insufficient light: While they don’t want direct sun, very low light slows growth and water uptake, leading to soggy soil.

Action Plan

1. Move to a brighter spot (east or north window, or a few feet from a south window).
2. Check soil moisture before watering—wait until the top inch is dry.
3. Switch to filtered/distilled water.
4. Cut back fertilizer to once a month at half strength.
5. Increase humidity.

If the plant doesn’t improve in 3–4 weeks, consider repotting into a well-draining, peat-based mix with perlite. A photo would allow precise identification and tailored advice.