- 1). Transplant your poinsettia plant into a pot that is 1 to 2 inches larger than the previous pot to allow for growth. At this stage, your plant may still grow but will not change colors. Use soil marked as potting soil for the best results.
- 2). Trim the plant down, so the only part that is left is about 6 inches from the soil up to the top of the plant. Cutting back the plant is best done in March when the colored portion of the plant has died.
- 3). Care for the plant indoors just as you would any other house plant, giving it water as needed to keep the soil moist, and fertilize it every two weeks. Keep the plant in a sunny location where the temperature is 60 degrees Fahrenheit or above.
- 4). Place the plant outdoors where it will receive sun and shade throughout the day once the danger of frost passes for the year.
- 5). Trim all new shoots down to about 4 inches whenever the new shoots grow beyond that point. Each new shoot should be left with three or four leaves per shoot. Stop trimming around the middle of August.
- 6). Bring the plants back inside in late August, and begin placing the plant in a dark location with no light, such as a closet or windowless room, every day between 8 p.m. and 5 a.m. Placing the plant in a dark location between these hours allows it to change colors in December.
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