When does marigold bloom?
As a widely popular ornamental flower in the gardening world, marigolds are deeply loved for their bright yellow flowers and extremely long blooming period. However, many growers are often affected by their lack of understanding of the blooming patterns, making precise blooming period management crucial.
Characteristics of Marigold Blooming Time
Natural Blooming Period Pattern
Under normal planting conditions, marigolds naturally bloom from July to September, with individual flowers often opening around 3 pm. When the ambient temperature stabilizes at 20°C, some early-maturing varieties enter the initial blooming stage in mid-June. Comparative experiments have shown that when the day-night temperature difference is maintained at 8-10°C, the bud development speed increases by about 30%.
Varietal Differences
Different varieties have a blooming period difference of 15-20 days: 1. Dwarf type: Early blooming variety, with a blooming period of 90-100 days2. Tall type: Late blooming variety, but individual flower duration extends by 3-5 days3. Double-petaled type: Flower density increases by 40%, but requires higher light intensity
Scientific Maintenance System forBlooming Period
Environmental Control Scheme
Temperature management needs to be implemented in stages: • Growth period: 18-25°C to promote bud differentiation• Blooming period: 22-28°C to extend flower life• Extreme weather: Set up shade nets/insulation films to cope with high temperatures and cold waves
Nutritional Supply Strategy
Adopt the fertilization principle of "phosphorus and potassium as the main, nitrogen as the auxiliary": • Bud formation stage: Apply potassium dihydrogen phosphate solution (0.2% concentration) weekly• Full blooming stage: Supplement with decomposed bone meal to replenish trace elements• Taboo: Excessive nitrogen fertilizer can lead to excessive leaf and stem growth, reducing the number of flowers by 60%
Practical Techniques for Extending the Blooming Period
Based on years of cultivation practice, three methods to enhance effectiveness are summarized: 1. Deadheading: Timely removal of wilted flowers stimulates the formation of new flower buds2. Water control: Keep the soil moist but not waterlogged, maintaining air humidity at 60%3. Light optimization: Ensure 6 hours of direct sunlight daily, supplemented with reflector boards to enhance lighting
Through systematic maintenance and management, the blooming period of marigolds can be extended to over 120 days, and the number of flowers per plant can increase by 2-3 times. Regularly observing the plant's condition and promptly preventing and treating common pests such as red spiders can keep the golden sea of flowers decorating the entire growing season.