Saving a Dieffenbachia After Cold Damage

A Dieffenbachia (dumb cane) with sentimental value—it came from a mother's funeral—was left overnight in a car where temperatures dropped into the low 20s (°F). The owner noticed black streaks on some leaves and wondered if the plant could recover.

Assessing Cold Damage

If the leaves only show black spots and the entire plant hasn't collapsed, the plant has a good chance. The roots are often insulated by the soil and may survive even when foliage is damaged.

Recovery Steps

• Location: Place the plant near a sunny window but out of direct sunlight.
• Watering: Water normally, but allow the soil to dry out between waterings. Empty the drain tray an hour after watering; do not let the plant sit in water.
• Patience: Wait for new growth before trimming damaged leaves. The plant will slowly replace injured foliage.
• Fertilizing: Once a month, apply a water-soluble fertilizer (e.g., Miracle-Gro) at half strength.

Overwatering is a greater risk than underwatering during recovery. With time and proper care, the Dieffenbachia should bounce back.

Advice from Darlene, volunteer plant expert.