Dumb Cane (Dieffenbachia) Care: Beautiful but Toxic

Striking Foliage, Serious Warning

Dieffenbachia hybrids have broad leaves splashed green/white. Sap causes painful swelling, vocal loss if eaten—hence “Dumb Cane.” Keep from pets/kids. Wear gloves (skin irritant).

Care Essentials

• Light: Bright indirect. No direct sun. Rotate for even growth.
• Water: Thoroughly, then allow top to dry slightly.
• Humidity: Average.
• Temp: 65–75°F. No cold drafts (new leaves drop).
• Soil: Soilless mix for drainage.
• Fertilizer: Every 2 weeks spring–summer, monthly fall–winter, half-strength liquid.

Leaf Diagnostics

• Old leaves yellow/drop = normal.
• New leaves drop = too cold.
• Brown tips = irregular watering.
• Curled tips = over-fertilized (flush soil).
• Loss of variegation = too little light.
• Scorched spots = direct sun.

Maintenance

• Prune if too tall: cut top, leave a few leaves; new growth sprouts.
• Repot spring/early summer when root-bound. Drainage holes.

Propagation

3–5 inch stem tip cuttings spring/summer in moist mix. Basal pups can be separated.

Tolerates average humidity well despite rainforest origins.