Light: When your customer takes their poinsettia home, recommend the following: place it near a sunny window where it will have the most available sunlight. A window that faces south, east or west is better than one facing north. If direct sun hits the poinsettias though a window, diffuse with a shade or sheer curtain.
Temperature: To keep the plant in bloom, maintain it at a temperature of 65 to 70 degrees F during the daylight hours and, if possible, move it to a cooler place at night. Because root rot disease is more prevalent at temperatures below 60 degrees F, do not put the poinsettia in a room colder than this. Avoid exposing the plant to hot or cold drafts, which may cause premature leaf drop. Temperatures below 50F will usually cause them to lose all their bracts and stop flowering.
Water: Examine the soil daily, and when the surface is dry to the touch, water the soil until it runs freely out the drainage hole in the container. The amount of water recommended in the table for use in various sized containers ensures that enough water will be applied so that some will run out the drainage hole. If a saucer is used, discard the water that collects in it. Do not leave the plant standing in water. Overly wet soil lacks sufficient air, which results in root injury.
Other Important Insights:
- No need to fertilize your poinsettias while in bloom. Fertilization is something best NOT to do while your poinsettia is flowering. This will also cause flowering to end prematurely, though it probably won’t hurt your plant as long as you use a well-balanced, water-based fertilizer.
- Keep your plant away from heavy drafts, fans, and air-conditioners. These plants are very sensitive to these minor fluctuations while flowering.