Simply cut 4-6″ inches long stem sections and remove the leaves. Pour a glass of water and place the dieffenbachia cuttings into it. You can change the water every few days or so. Keep the jar in a bright and warm spot but out of direct sunlight as that can shrivel the plant.
As a general guide, use a complete fertilizer such as 20-20-20 and feed every 4-6 weeks only during the active growing season. Maintain moderately moist soil. Watering is an important part of growing dieffenbachia. Water thoroughly and then not again until the surface of the potting medium is dry to the touch.
Dieffenbachia prefers diffused sunlight or partial shade, but will tolerate full shade, which is why it is well-suited as a houseplant. It thrives in temperatures between 60 and 75°F. Your dieffenbachia should be watered regularly, with soil being allowed to dry between waterings.
Dieffenbachias will not tolerate low temperatures. Anything below 60° degrees Fahrenheit and growth begins to slow. Some varieties start to show cold damage when temperatures fall below 55° degrees Fahrenheit. In fact, high temperatures and bright light can make Dieffenbachia weak and sickly.
Make a small hole in the planting medium with a pencil and place the powdered stem end in the hole. Push the medium up against the stem to hold it in place. Repeat with all the other pieces of stem you wish to root. Keep the cuttings moist, but not wet, and place the planter in a warm, dim spot.