Dumb cane care guide
Dieffenbachia
Also known as: Leopard lily, Dieffenbachia seguine
Pets and children
Considered toxic
All parts are rich in calcium oxalate: chewing causes severe mouth and tongue swelling and pain, sometimes even trouble vocalizing, and the sap irritates skin and eyes, so keep it out of reach and consult a veterinarian, or a doctor for a child, if eaten.
How often to water Dumb cane
- Spring–Summer (Mar–Sep)
- Every 5 days
- Water thoroughly once the topsoil dries, as a guide; midsummer dries it fast, but constantly wet soil rots the stem base.
- Autumn (Oct–Nov)
- Every 7 days
- Generally water about two days after the soil dries; cooler weather slows drying.
- Winter (Dec–Feb)
- Every 10 days
- Water lightly about three to four days after the soil dries; cold, wet soil brings root rot.
Light and placement for Dumb cane
Bright shade behind a sheer curtain is about right; direct sun scorches the variegation, deep shade fades it and stretches the stem, and it likes moving air.
Overwintering Dumb cane
Overwintering guide: 10°C (50°F) or above
Tender to cold: overwinter it indoors above about 10°C, away from chilly windows, and water less to keep it on the dry side.
Fertilizing and repotting Dumb cane
Fertilizer
Slow-release fertilizer about every two months from May to September; overfeeding makes it leggy, so keep it modest, and give none in winter.
When to repot
Spring–Summer (Mar–Sep)
Common problems with Dumb cane
- Winter cold yellows and droops the leaves and the stem rots at the base.
- Overwatering rots the roots and the lower leaves drop one after another.
- Sap on the skin during pruning causes a rash.
Tips for growing Dumb cane
- Wear gloves when pruning or repotting and keep the sap away from your eyes.
- When the stem grows bare and tall, cutting it back in early summer brings new shoots from below.
- Cut stem sections with a node can be laid on soil or rooted in water.
These are AI-generated general guidelines. They vary with the variety, the placement and the pot size. For effects on pets or children, consult a veterinarian or a doctor.
Keep your plant log going
Greenery is a free app that keeps your plant care going, with watering reminders and photo records. Available on iOS and Android.
