When do roses bloom?
For many girls, the introduction of when roses bloom and how to maintain green plants and flowers will definitely help you. Let's learn together!
The flowering period of roses varies with species and climate, but the natural peak flowering period of most rose varieties is from April to October every year. Among them, May and June are the peak period of spring flowers, and September and October usher in the peak of autumn flowers. Some cold-resistant varieties can continue to bloom until November. Mastering scientific maintenance methods can significantly prolong the flowering period and improve the quality of flowering.
1. Analysis of the seasonal rules of rose flowering 1. Natural flowering characteristics (1) Spring flowering period: germination occurs when the temperature is stable above 15℃, and the environment of 20-25℃ is the most suitable for flower bud differentiation. Blooming begins in late April in Jiangnan and delays until mid-May in the north. The first flowering volume accounts for 40% of the whole year, and the flower type is standard and the aroma is strong. (2) Summer dormancy period: Growth slows down at high temperatures above 30℃, and petals are easy to scorch. However, tropical varieties such as "Iceberg" can still continue to bloom under shaded conditions, so attention should be paid to maintaining a 50% shading rate. (3) Double flowering period in autumn: When the temperature difference between day and night exceeds 10℃ (September to October), a secondary flowering peak is formed, and the flowering period is 5-7 days longer than that of spring flowers. The north needs to complete pruning before the frost falls. 2. Comparison of variety differences·Four-season flowering seeds: For example,"Caiyun" rose blooms 6-8 times a year, with a single flowering period of 7-10 days·Single-season flowering seeds: Traditional old roses mostly bloom in May, with a flowering period of about 20 days·Potted micro-month: Annual flowering can be achieved at indoor constant temperature above 15℃. 2. Six core points of scientific maintenance 1. Light management requires direct light for more than 6 hours a day, and appropriate shade in summer afternoons. Potted plants rotate 180° every half of the month to prevent deviation from the crown. For planting in glass greenhouses, UVB fill light needs to be used to supplement ultraviolet light. 2. Precise watering (1) Soil testing method: Water replenishment is needed when the surface layer is 3cm dry. Potting can be used to reduce the weight by 1/3.(2) Drip irrigation system: Set once in the morning and evening, and water supply is 15 minutes per time. Automatic irrigation needs to be turned off in rainy season (3) Water quality requirements: EC value <1.0ms/cm, pH 6.2 -6.8 is the best, tap water should be left to stand for 24 hours to dechlorinate 3. Fertilizer ratio plan (1) Base fertilizer: buried in decomposed sheep manure (3kg/m2)+ bone meal (0.5 kg/m2) in winter (2) Top dressing during the growth period: ·Leaf expansion period: nitrogen, phosphorus and potassium 20-10-10-10 water-soluble fertilizer, once a week·Bud pregnancy period: switch to 15-30-15 high-phosphorus formula·After flowering: add trace element fertilizer (containing 2% iron and 1% manganese) 4. Tips for pruning techniques (1) Pruning after spring flowers: Keep 3-5 bud eyes at the base, and the incision is 1 cm away from the bud point and has a 45° angle (2) Overwintering pruning: Keep 30cm of main stems in northern areas and apply wound healing agents (3) Blind branch treatment: When found unbloomed, cut off immediately from the base to avoid nutrient consumption. 5. Pest and pest control plan (1) Black spot disease: spray 3000 times of tebuconazole at the beginning of the disease, once every 7 days for 3 consecutive times (2) Red spider: install blue sticky insect boards for monitoring, use biphenylzate spray when the insect population density is>50 heads/cm² (3) Megcutting bees: hang silver reflective film to interfere with adult positioning 6. Special environmental response (1) Balcony planting: Select dwarf varieties such as "Juice Balcony" and match them with Qingshan 32 root-control pot (2) Overwintering in the north: 30cm thick soil is needed in-15℃ areas and wrapped in non-woven fabrics to prevent cold (3) During the rainy season: Build a rainproof canopy and spray 2‰ potassium dihydrogen phosphate on the leaves to enhance resistance. 3. Flower promotion and flower control techniques 1. Flowering control method·Early flowering: Warm the greenhouse to 18 ° C in winter, and use LED light to fill light for 14 hours/day·Delayed flowering: Move the flower buds into a 5 ° C cold storage when they sprout, and can be stored for up to 6 weeks·Multiple flowering: Immediately after flowering Cut off residual flowers, keep 5 intact leaflets to promote the germination of new branches 2. Quality improvement measures (1) Bud thinning management: Keep 1-2 strong flower buds per branch, and removing side buds can increase the diameter of the main bud by 30%(2) Thickening petals: spray 0.1% chelated calcium solution at flowering stage, spray twice a day at an interval of 10 (3) Coloring control: When the temperature difference reaches above 8℃, the color of red varieties will be deeper. 3. Cut flowers are harvested from 5:00 a.m. to 7:00 a.m., immediately inserted with 8-HQS preservative (200ppm)+3% sucrose solution, and stored at 5℃. Commercial varieties should choose varieties with strong stems such as "Corola", which can have a post-harvest life of up to 15 days. Through refined maintenance and management, the annual flowering volume of potted roses can reach 50-80, and the yield of locally planted roses can exceed 120. The key is to grasp the annual management rhythm of "storing energy in winter, promoting flowers in spring, protecting seedlings in summer, and raising roots in autumn", supplemented by a scientific pest and disease prevention system, so that high-quality and sustained flowering can be achieved. (The full text totals 1520 words) The above detailed content about when roses bloom and how to maintain them, I hope it can help you!