Poinsettias require timely pruning from the cutting stage through transplanting and into flowering, with three to four prunings to encourage more branching. The latest suitable time for pruning is mid-August. Pruning too early can hinder growth, while delaying it may delay flowering. In greenhouses, poinsettia flower buds typically form by mid-October. At this point, the plants are moved indoors and given 7 hours of light daily. As a short-day plant, poinsettias rely on short daylight hours and early greenhouse conditions to bloom earlier.
By mid-October, without heating, the average high temperature reaches 30°C, while the low hovers around 14°C. The flowers have a diameter of 35mm, with 26 red bracts. Each bract measures 4cm in width and 15cm in length, displaying a vibrant red color. With ample sunlight, poinsettias look their best when placed in direct sunlight upon entering the greenhouse. This allows full photosynthesis, ensuring sufficient nutrients for healthy growth and vibrant red bracts. A fully decomposed organic fertilizer applied three days before blooming helps produce large, lush blooms with bright colors.
Soil preferences for poinsettias include well-draining, acidic sandy soil with a pH between 5.5 and 6. Avoid using alkaline potting mixes. During the growing season, apply a diluted fertilizer every week along with watering to support healthy development.
Temperature control is crucial. Cuttings should be propagated at 15–20°C. From April to October, the ideal temperature range is 16–25°C, while from November to March, it should be slightly cooler, around 13–16°C. During winter nights, keep the room temperature around 15°C, ensuring it doesn’t drop below 5°C. If kept at around 12°C, the viewing period can be extended.
Poinsettias thrive in warm, moist, and sunny environments. In May, they should be moved to a well-ventilated area. During summer, avoid direct sunlight—use shade structures or place them under trees, and water frequently to maintain humidity. Proper care ensures strong, healthy growth and beautiful blooms.
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