Dieffenbachia seguine
Dieffenbachia seguine (Dumb Cane) Care Guide
Featured photodieffenbachia-seguine.jpgDieffenbachia seguine is the dumb cane, a tropical American aroid with broad, cream-and-green variegated leaves on thick canes. The trade name comes from the temporary speech loss caused by the calcium oxalate sap on contact with the mouth — it is one of the more dangerously toxic common houseplants and should be kept away from children and pets. It is otherwise an easy and dramatic foliage specimen.
Care facts at a glance
- Light
- Bright indirect
- Water
- Water when the top 2 to 3 cm of mix has dried.
- Humidity
- 40–60 %
- Temperature
- 18–27 °C
- Soil
- Well-draining houseplant mix with perlite.
- Toxicity
- Toxic. Sap causes painful mouth and throat swelling — keep firmly out of reach. (humans) · Toxic to cats and dogs per ASPCA Dieffenbachia listing. (pets)
- Origin
- Tropical Americas from southern Mexico through the Caribbean to Brazil.
- Mature size
- 60 to 180 cm tall.
Overview
Dieffenbachia seguine is one of the most-grown variegated aroids and the source of the dumb cane trade name. The dramatic cream-and-green leaves and the strong toxicity are equally well-known.
Care Priorities
- Bright filtered light keeps variegation vivid.
- Allow the top of the mix to dry between waterings.
- Wear gloves when pruning; sap is irritant on skin.
- Keep firmly out of reach of children and pets.
Common Problems
Yellow lower leaves are overwatering or normal age turnover. Loss of variegation in low light is reversible by moving to a brighter spot. Leggy growth with bare lower stems can be cut back to renew the plant.
Sources & further reading (3)
- encyclopedia — accessed 2026-04-28
- botanical-garden — accessed 2026-04-28
- toxicity-database — accessed 2026-04-28
Frequently asked questions
How toxic is dumb cane?
Very. Calcium oxalate raphides cause painful mouth and throat swelling, sometimes lasting hours. Treat as one of the most dangerous common houseplants. Keep out of reach.
Can I cut it back?
Yes — dumb cane responds well to hard pruning. Cut the cane to about 15 cm and the stump usually pushes new shoots within weeks. Wear gloves.
Why is it called dumb cane?
Because chewing the cane causes temporary speech loss from mouth and throat swelling. The name is a serious warning, not folklore.
