Dumb Cane Plant Care

Dumb Cane get its name from its poisonous sap that causes painful swelling of the mouth and throat, as well as vocal loss if eaten. Keep it away from pets who may play with or chew on this plant. It also can cause skin irritation, so I recommend wearing gloves while handling this plant.

Get to Know Dumb Cane Houseplant

Known botanically as Dieffenbachia, this handsome houseplant has origins in Brazil, where it grows in year-round warmth. Although dumb cane plant is native to the South American rain forests, it tolerates average room humidity quite well and is easy to grow.

Dumb cane features a single, thick trunk that unwinds into several trunks as it matures.

Its handsome, broad leaves are about 10 inches (25 cm) long and are splashed, streaked or speckled in green and white. 

How big does it get? Depending on the variety, dumb cane will reach a height of 1-6 ft (30 cm - 1.8 m). Newer cultivars are more compact, reaching only 1-2 ft (30-60 cm) tall.

Don't be afraid to prune your Dieffenbachia if it grows too tall. Use sharp, clean pruners to cut off the top of the plant, leaving a few leaves. New growth will sprout from where it was cut.

Dumb cane is poisonous to cats and dogs. According to the ASPCA, Dieffenbachia contains insoluble calcium oxalates. When ingested, dumb cane causes intense burning of the mouth, excessive drooling, vomiting, and difficulty swallowing. 

Dieffenbachia Varieties

Many varieties of Dumb Cane are available with varied leaf patterns. Choose one based on your own preference because they're all easy to grow. 

You'll find Dieffenbachia for sale in nurseries or online year-round. 'Tropic Snow' is heavily marbled with creamy white and has green central veins. 'Camille' is compact reaching only 15 in (38 cm) tall and has green-yellow leaves edged in dark green with white central veins. 'Exotica' has leaves patterned with dark green and creamy yellow blotches with white central veins.

Dumb Cane Problems and Solutions

Any problems with Dumb Cane will show in its leaves.

• The older leaves may turn yellow and drop off. This is normal. If new leaves fall off, the plant is too cold. Keep it away from doorways or windows where could be exposed to cold drafts.

• Brown leaf tips are caused by sporadic watering. Water regularly, but don't allow the soil to get soggy.

• Curled, crispy leaf tips could indicate too much fertilizer. Flush soil with clean water to wash away any accumulated fertilizer. Wait a month before feeding again.

• If they are not getting enough light, leaves lose their variegation. Give the plant moderate to bright light, but not direct sun.

• Scorched leaves (dry, brown spots) are caused by strong, direct sunlight.

• Drooping leaves are a symptom of dry soil. Don't allow the potting medium to dry out completely.

Something bugging your Dumb Cane plant?

Watch for cotton-like mealybugs. They tend to cluster along stems and the undersides of leaves. These dreaded pests will suck plant juices, causing damage to an infested  houseplant. 

Pale, blotchy leaves may be a sign of spider mites. You'll spot their webbing between leaves and stems. These tiny spiders are difficult to see, as well as get rid of. Isolate any infested houseplant and treat it immediately to prevent damage.

When to Repot Dumb Cane Plant

If you just brought your dumb cane plant home, it's a good idea to wait at least a month before repotting. Why? Pulling a plant out of its nursery pot and possibly tearing its roots causes stress for a relocated houseplant. It's adjusting to new lighting, temperature, and humidity in its new home. 

Repot when your houseplant has outgrown its pot. Are there roots growing through the drainage holes of the pot? Slip the plant out of its pot and take a peek at its roots. If the pot is filled with roots and little soil, it's definitely time to repot.

• Spring or early summer is the best time to repot, when the plant is beginning its most vigorous time of growth.
• Use a pot that is 1-2 inches larger than the old one. Why? A pot that's too big will hold too much water, which leads to root rot.
• Always use a container with drainage holes to prevent soggy soil.
• Get the steps to repotting your houseplant here.

Dumb Cane Plant Care

Light: Bright light, no direct sun. Give plant a quarter turn every few days to expose all sides to sunlight and encourage even growth. 

Water: Water thoroughly and allow soil to dry out a bit between waterings. Drooping leaves on Dumb Cane indicates it's too dry. Water regularly with room-temperature water and use a pot with drainage holes so its roots are not sitting in water.

Humidity: Try to maintain 40% relative humidity or higher. Indoor air can become extremely dry in winter. Take a look at these easy ways to increase humidity for your tropical houseplants.

Temperature: Normal room temperatures 65-75°F/18-24°C year-round.

Soil: Peat moss-based potting mix with added perlite to allow good drainage.

Fertilizer: Feed spring through summer every 2 weeks with a liquid or water-soluble fertilizer diluted by half. In fall and winter, feed monthly.

Propagation: Take 3-5 inch (8-13 cm) stem tip cuttings in spring or early summer and insert in moist potting mix. Pups that emerge from the base of the plant can be cut away and planted in their own containers.

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