Dumb Cane
Dieffenbachia oerstedii Origin: New World Tropics, Central America and the Caribbean
Dumb Cane are hearty tropical perennial plants with patterned leaves atop tall, fleshy stems. The sap of this plant is extremely toxic to humans and animals alike: when ingested, it can numb the throat or vocal cords, and when handled, skin can become extremely irritated. Prune with caution and keep them far away from pets.
Common Issues
Yellow leaves: This is typically caused by overwatering or lack of light. Yellowing lower leaves is a sign that the plant is trying to lighten the energy load.
Leaf tip dieback: This could be a sign of insufficient water or very low humidity.
Light: While Dumb Cane can grow in low light situations, they will not be their best selves without bright indirect light. Their beautiful foliage will burn if left in direct sunlight for more than a couple of hours a day.
Water: Dumb Cane appreciates moist conditions and should be only allowed to dry slightly between waterings. Their thick succulent stems make them tolerant of drought, but the stress of underwatering can make them susceptible to other issues.
Humidity: Keep your Dumb Cane in moderate to high humidity if possible. Their big, broad leaves will start to show signs of stress quickly (brown tips and crisp edges) if the humidity drops too low.
Growth: Dumb Cane is known for its broad, deep green foliage and distinct white central vein. Its lush foliage is produced in whorls atop thick fleshy stems or ‘canes’ that can grow to over 5 feet tall in ideal conditions. In the average home, you can expect your Dumb Cane to reach 3 to 4 feet in time.
Soil: A general potting mix is sufficient for these plants but they will respond well to mixes with perlite or bark additions to increase drainage.
Temperature: These are truly tropical plants and their leaves will damage quickly in cold temperatures. Try to keep your Dumb Cane between 65-85°F and avoid drafty windows and doors.
Repotting: Dumb Canes will usually need repotting because they lose their balance, not necessarily because they need fresh soil. It’s best to find a wide, heavy pot for these guys, often called ‘azalea pots.’ When repotting, be sure to lightly tease their roots apart as this helps them from wrapping in circles around themselves.
Extra TLC: If your Dumb Cane is in a low light environment, allowing the soil to dry out more regularly will be key to its survival. Low light and high soil moisture will quickly lead to rot in these slow-growing plants.