When do roses bloom?
As a traditional famous Chinese flower, roses are a popular choice for courtyard planting thanks to their super long blooming period of up to 200 days and their fragrant aroma. Mastering the blooming patterns and regulation methods of roses can make this "Queen of Flowers" achieve a four-season blooming display.
Core Rules of Rose Blooming Cycle
Roses, native to China, now have thousands of varieties. According to their blooming characteristics, they can be divided into four-season blooming types and seasonal blooming types. Most modern roses bloom from the beginning of May to mid-November, with a flowering period of 3-7 days for a single flower during the peak season, showing a wave-like blooming feature for the entire plant.
Dynamic Relationship between Temperature and Flowering Period
The first batch of spring flowers (15-22℃) can last for 10-15 days, the flowering period of a single flower in high summer temperatures (>30℃) is reduced to 3 days, and the duration of the autumn reblooming (20-25℃) rises to 7 days. Thick-petaled varieties like 'Peace' rose have a blooming period 30% longer than thin-petaled varieties.
Three Secrets to Promoting Rose Blooming
1. Long日照 Accurate Control
Roses are typical long-day plants, requiring at least 6 hours of direct sunlight per day. By extending the daylight to 14 hours with supplementary lighting in the northern regions, winter dormancy can be broken. Using reflective film to enhance the lower leaf exposure to light can increase the number of flowers by 40%.
2. Pruning Timing Control Method
In winter, heavy pruning is done to retain main branches of 15cm, and in spring, after flowering, 1/2 of the branches are cut diagonally at a 45° angle. In June, light pruning (removing 1/3 of the branches) is carried out, along with removing side buds, which can double the number of autumn flowers. Attention should be paid to tool disinfection to prevent pathogen infection.
3. Nutrient Supply Equation
For new seedlings, a matrix of humus soil: perlite=7:3 is used, mixed with 5% bone meal. For mature plants, 3kg/m² of decomposed sheep manure is applied every February, and during the bud stage, a phosphorus-potassium liquid fertilizer (N-P-K=1-3-2) is supplemented weekly, with the EC value controlled between 1.2-1.8mS/cm.
Through the three-dimensional management of light-temperature control, scientific pruning, and precise fertilization, combined with variety selection (recommended 'Hong Shuangxi', 'Golden Celebration' and other diligent flowering varieties), the goal of annual flowering can be achieved. Record the flowering diary, adjust the maintenance plan according to local climate conditions, and make roses truly become the time artists of the courtyard.