How to propagate Rieger begonias through cutting
As an indoor potted plant with both ornamental flower and foliage value, Rieger begonias are deeply loved by horticulture enthusiasts for their bright and colorful flowers. Mastering the correct cutting method can not only continue the superior characteristics of the parent plant but also achieve plant propagation at a low cost. This article will systematically explain the key technical points from time selection to post-cutting care.
1. Core Steps for Propagating Rieger Begonias through Cutting
Best Cutting Season Selection
Cutting can be done throughout the year, but spring and autumn are the best seasons. During these seasons, the diurnal temperature difference is stable between 15-25°C, and the air humidity is maintained at 60%-70%, which is conducive to the rapid formation of callus tissue at the cut. In summer, it is necessary to avoid continuous high temperatures above 30°C, and in winter, the ambient temperature should not be lower than 12°C.
Criteria for Selecting High-Quality Cuttings
Select robust two-year-old parent plants and pick complete leaves with a 1.5cm petiole. Special attention: leaves with prominent veins and an intact waxy layer without mechanical damage have the highest survival rate. During treatment, use a 45° diagonal cut to increase the water absorption area, and soak in a 1000ppm indole butyric acid solution for 10 minutes before drying in the shade.
Substrate Formula Optimization
It is recommended to use a mixed substrate of perlite: peat soil: decomposed pine needles in a ratio of 3:5:2, with an EC value controlled between 0.8-1.2mS/cm. The substrate must be sterilized with high-temperature steam to avoid carrying pathogens such as Fusarium. When potting, keep the moisture content of the substrate at around 40%, firm enough to form a ball when held in hand but easily crumbled when released.
2. Detailed Management after Cutting
Environmental Control Points
Use a misting system to maintain 85% air humidity, and control the light intensity between 5000-8000Lux. Disinfect the environment every 3 days with a 0.1% carbendazim solution to prevent the occurrence of gray mold. Start applying 50ppm ABT root nutrient solution 20 days after cutting.
Root Development Observation
Under normal conditions, white new root points can be observed after 4 weeks, at which time the light can be gradually increased to 10000Lux. If the edges of the leaves become scorched, immediately check for waterlogging that may cause root hypoxia. Plants that have successfully rooted should be transplanted with the original substrate to avoid damaging the new fine roots.
Through scientific temperature and humidity management and standardized cutting operations, the success rate of propagating Rieger begonias can reach over 90%. It is recommended that enthusiasts keep a care log, recording the cutting response characteristics of different varieties, and gradually develop a personalized propagation system.