Tip for Potted Poinsettia: The poinsettia, also known as the "pouch flower," is sensitive to temperature changes. It prefers cooler conditions during the day and night. For seedlings, a daytime temperature of 20°C and nighttime around 10°C is ideal. In winter, maintain a temperature between 7°C and 10°C, while in spring, it should be between 10°C and 13°C. Ensure that temperatures do not drop below 3°C during winter. Temperatures above 20°C can harm the plant’s growth and flowering. The optimal temperature for blooming is 10°C, which helps extend the viewing period. Poinsettias require consistent moisture but are sensitive to overwatering. Keep the soil evenly moist, especially during the growing phase. If the soil dries out slightly, leaves may wilt quickly. However, overly wet soil combined with low temperatures can lead to root rot. Avoid misting the leaves directly, as this can cause leaf rot. After removing the flowering branches, allow the soil to dry slightly but not completely to prevent excessive vegetative growth. As a long-day plant, poinsettias need adequate light. Seedlings thrive in bright light, which promotes strong leaf development and disease resistance. However, they should be protected from intense sunlight. To encourage early flowering, provide 14 hours of daily light, which helps accelerate bud formation and reduce the overall growth cycle. The ideal soil is well-drained, fertile, and slightly acidic (pH 6.0–6.5). A mix of garden soil, compost, and sand works well for potting. Propagation Methods: Poinsettias are mainly propagated through seeds. The seeds are small—about 25,000 per gram—and germinate best at 18–21°C. Sow indoors between August and September. Early sowing can lead to weak seedlings due to high temperatures, while late sowing may delay flowering. Before sowing, sterilize the potting soil. Place the seeds on the surface without covering them. Water from the bottom, cover the container with glass or plastic, and place it in a shaded area. Germination usually occurs within 7–10 days. Once the cotyledons appear, thin out the seedlings and ensure good air circulation while maintaining humidity. Keep the room temperature between 16°C and 18°C. Cultivation Management: Two weeks after sowing, when the seedlings reach 2.5 cm, transplant them into fresh soil. At 30 days post-transplant, move them to pots measuring 10–15 cm in diameter. Maintain a room temperature of 10–12°C. For accelerated growth, expose plants to 6–8 hours of light daily to promote earlier blooming. During the growing season, ensure proper ventilation and shading to prevent pests and sunburn. Fertilize every two weeks, but avoid excessive nitrogen, as it can cause leggy growth and weak stems. When the flowering branch appears, apply phosphorus and potassium fertilizer once or twice. Remove lateral buds between the leaves promptly to maintain an even shape and prevent overcrowding. In large-scale production, spraying 0.2%–0.3% CCC solution on the leaves 1–2 times can help control plant height and improve appearance. During flowering, strictly manage watering and keep the temperature between 8°C and 10°C. Perform artificial pollination to increase seed set. As fruit develops, increase ventilation and shading to ensure full maturation. High heat and humidity can cause premature death if not controlled. Pest Control: High humidity and temperature can lead to root rot and Other physiological issues. Ensure good air circulation and shading during the growing season. Aphids and other insects may damage the flowers and leaves. Use 40% dimethoate diluted at 1500 times to control infestations. Post-Flowering Care: The poinsettia is a popular choice for festive occasions, especially during the Spring Festival. Its vibrant red bracts add a lively atmosphere to any space. Placing it near windows, balconies, or in guest rooms creates a striking visual impact. In shopping malls, hotels, and airports, poinsettias are often used to enhance the ambiance. In kindergartens, they can spark children's interest in botany. However, poinsettias are prone to ethylene damage during transportation, which can cause flowers to drop. To prevent this, spray the plants with a 0.2–0.5 mM silver thiosulfate (STS) solution about two weeks before transport to preserve their ornamental value. Wave Elastic Washer,M20 Wave Spring Washer,Spring Washers Gb955,Wave Spring Lock Washer Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com