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Dieffenbachia

Common name: Dumb cane · Leopard lily

Dieffenbachia is a genus of tropical perennials in the arum family, native to Central and South America. They grow upright, cane-like stems topped with large, boldly patterned leaves in cream, yellow, and green. They are popular foliage houseplants but require caution because their sap is highly irritating.

Fun facts

  • The common name "dumb cane" comes from the sap's effect: chewing it swells the mouth and throat and can temporarily take away speech.
  • The genus is named after Joseph Dieffenbach, a 19th-century head gardener of the imperial palace gardens in Vienna.
  • Its calcium oxalate crystals made the plant historically notorious — it was misused as a means of torture and punishment.
  • Like other aroids, it can produce a spathe-and-spadix flower, though it rarely blooms indoors.

Care summary

Sun Bright indirect light
Water Keep evenly moist, never soggy
Soil Rich, well-draining potting mix
Hardiness Zones 10–12
Mature height 1–3 m (3–10 ft)
Pet safe No — highly toxic if ingested

Common problems

    • Let top soil dry before watering
    • Repot into a free-draining mix
    • Empty saucers after every watering
    • Rinse foliage under a strong spray
    • Raise humidity around the plant
    • Treat with insecticidal soap
    • Move closer to a bright window
    • Cut canes back to encourage branching