Poinsettia requires timely pruning from the cutting stage through transplanting and into flowering. It should be pruned three to four times to encourage more branching, with the latest pruning ideally done by mid-August. Pruning too early can hinder growth, while delaying it may delay flowering. In greenhouses, flower buds begin forming around mid-October. At this point, poinsettias are moved indoors and given 7 hours of light daily. As a short-day plant, poinsettias rely on short daylight hours and controlled greenhouse conditions to bloom early.
By mid-October, without heating, the average high temperature is around 30°C, and the low is about 14°C. The flowers have a diameter of 35mm, with 26 red bracts. Each bract measures 4cm in width and 15cm in length, with a vibrant red color. When placed in direct sunlight, poinsettias look their best. They should be positioned where they receive full sun to maximize photosynthesis and ensure strong growth. During the flowering period, applying fully decomposed organic fertilizer three days prior helps produce large, colorful blooms with lush green foliage.
Soil preference for poinsettias is acidic sandy soil, with an ideal pH range of 5.5 to 6. Avoid using alkaline potting mix. During the growing season, apply a diluted fertilizer solution weekly along with watering.
Temperature control is crucial. For cuttings, the ideal range is 15–20°C. From April to October, the optimal temperature is 16–25°C, while from November to March, it should be kept between 13–16°C. Maintain a room temperature of around 15°C during winter nights, ensuring it doesn’t drop below 5°C. If the temperature is kept around 12°C, the blooming period can be extended.
Poinsettias thrive in warm, humid, and sunny environments. In May, plants are moved to well-ventilated areas to prevent overcrowding. In summer, avoid direct sunlight by using shade structures and frequently water the ground to increase humidity. This helps maintain the health and vibrancy of the plants throughout the growing season.
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