How long does the blooming period of osmanthus last?
As one of the top ten famous traditional Chinese flowers, osmanthus is deeply loved for its refreshing fragrance and golden cluster flowers. Mastering its blooming period and the key points of post-blooming care can not only extend the viewing period but also maintain the healthy growth of the plant. This article will systematically analyze the essence of osmanthus horticultural management from the characteristics of the blooming period to scientific care.
Analysis of Osmanthus Blooming Period
Natural Blooming Period and Varietal Differences
Conventional varieties (golden osmanthus/dan osmanthus/silver osmanthus) bloom from mid-September to early October, with a blooming period of 20-25 days. In the Yangtze River Valley, due to the warm climate, they bloom 3-5 days earlier than in the northern regions. As a special variety, the four-season osmanthus can bloom 3-4 times a year through temperature control, with a total blooming period of over 180 days. However, the number of flowers decreases by about 30% each time, and the fragrance intensity also gradually weakens.
Climate and Environmental Impact
When the day-night temperature difference reaches 8°C or more, the efficiency of flower bud differentiation increases by 40%. Continuous rainy weather during the blooming period can cause the flowers to fall early, so it is recommended to build a temporary rain shelter. In areas with excellent air quality, the fragrance of osmanthus can spread up to 100 meters.
Complete Guide to Osmanthus Post-Blooming Care
Light Control Techniques
Immediately after blooming, move to a diffused light environment, controlling direct sunlight to 2 hours a day. Strong light can increase the rate of petal scorching by 60%, and a 50% shade net can be used for protection. In the northern regions, sudden transfer to an indoor environment can cause leaf fall, so light adjustment should be gradual.
Accurate Water Management
Use the 'dry-wet' method: water thoroughly when the top 3cm of the soil is dry, avoiding waterlogging that can cause root rot. A bamboo stake can be inserted to test moisture, and water should be added when the stake has no soil attached. Maintain air humidity between 60%-70%, and increase humidity through misting, but avoid the high-temperature noon.
Scientific Fertilization Strategy
Stop using nitrogen fertilizer after blooming and switch to phosphorus-potassium fertilizer (N-P-K=0-15-15) to enhance stress resistance. Apply decomposed organic fertilizer before the next year's germination, with the recommendation of using sheep manure (2-3kg per plant) mixed with bone meal (200g per plant). For potted plants, a seaweed acid water-soluble fertilizer can be used, with a concentration of 800 times liquid.
Pruning and Shaping Tips
Complete pruning within 15 days after blooming, removing residual flower branches and crossed branches, and retaining healthy spring shoots. Use the 'three-cut method': first cut the weak and dead branches, second cut the inner branches, and third cut the overgrown branches. After pruning, apply a healing agent to the wounds to prevent infection by pathogens.
Through precise control of light, water, temperature, and fertilizer, the number of flowers in conventional varieties can increase by 20% the following year, and the blooming period of the four-season osmanthus can be extended by 7-10 days. Regularly observe the leaf condition and promptly prevent and treat pests and diseases such as spider mites to ensure that the osmanthus blooms fragrantly every year.