Why Dieffenbachia Leaves Turn Yellow and How to Fix It

Common Causes of Yellowing in Dieffenbachia

Dieffenbachia (dumb cane) yellowing usually stems from watering issues, but light, pests, and natural aging also play roles.

Overwatering: The #1 Culprit

Soggy soil suffocates roots, causing lower leaves to yellow and drop. Water only when the top inch (small pots) or top quarter (large pots) of soil is dry.

Underwatering & Low Humidity

Hot, dry air and inconsistent watering cause tip burn and yellowing. Increase humidity with a pebble tray or humidifier.

Spider Mites

Check leaf undersides for tiny mites or webbing. Shake a leaf over white paper to confirm. Treat with insecticidal soap or neem oil.

Natural Aging

Older lower leaves yellow and drop as the plant grows taller. This is normal—just trim them off.

Care Summary

• Bright, indirect light; no direct sun.
• Well-draining soil; water when appropriately dry.
• Inspect regularly for pests.
• Prune to maintain shape and encourage bushiness.