How to Make Poinsettia Bloom
As the most popular ornamental plant during the Christmas season, poinsettia adds a touch of color to winter homes with its bright bracts. However, many plant enthusiasts are often confused about how to make the plant bloom smoothly and how to scientifically care for it after flowering. This article will systematically analyze the complete care process from promoting blooming to post-flower management.
The Three-Part Guide to Growing Poinsettia
The Golden Rule of Temperature Control
Managing day and night temperature differences is key to promoting blooming, with a gradient of 22°C during the day and 18°C at night required from September to October. When the night temperature consistently drops below 16°C, move the plant indoors immediately and use a heating mat to keep the substrate temperature between 20-22°C. Avoid direct air conditioning and maintain 40%-60% humidity during winter heating with a humidifier.
Advanced Nutrition Supply Plan
Use a water-soluble fertilizer with a 3:1:2 ratio during the growing season, applying an 800-fold diluted solution every 10 days. During the bud differentiation stage, switch to a high-phosphorus formula (10-30-20) and spray with seaweed acid foliar fertilizer every two weeks. It is especially recommended to bury decomposed bone meal in the top layer of the potting soil to continuously release phosphorus and promote bract coloring.
Core Techniques for Shaping and Pruning
Pinch the plant for the first time when the new shoots reach 15cm, leaving 4-6 true leaves. Use the S-shaped winding method to guide the branches and rotate the pot 45 degrees weekly to ensure even lighting. Stop pruning 2 months before budding to avoid damaging the flower buds.
Post-Flowering Care Regeneration System
Three-Level Pruning Method
Immediately after the flowers fade, cut the main branches back to 15cm and keep 3-4 buds on the secondary branches. Use pruning shears sanitized with alcohol to make a 45-degree diagonal cut and apply wood ash to the cut to prevent infection. Retain 2-3 functional leaves at the base to maintain photosynthesis.
Dormant Period Management
After pruning, place the plant in a cool environment with a temperature of 16-18°C and control water to maintain 30% moisture in the substrate. Apply a 2000-fold diluted solution of brassinolactone once a month to promote the germination of dormant buds. Gradually increase lighting after new buds have unfolded leaves, using a sunshade net during the transition period to prevent burns.
Through scientific temperature control, precise nutrition management, and systematic pruning, not only can you achieve annual reblooming, but you can also cultivate high-quality plants with full canopies. It is recommended to replace the potting mix with a 7:3 ratio of peat and perlite every year, combined with regular pot rotation, making poinsettia a festive ornamental plant that can be enjoyed year after year.