How to propagate lilacs through cutting
Lilacs are favored by gardening enthusiasts for their elegant fragrance. Propagation by cutting is an economically efficient asexual method that can completely retain the superior characteristics of the mother plant. Mastering the three major elements of branch treatment, substrate proportion, and temperature and humidity control, combined with the best timing, can increase the success rate of cutting to over 80%.
Core operational process of lilac cutting
Criteria for selecting high-quality cuttings
Choose semi-woody tender branches, controlling the diameter between 0.5-0.8 cm and retaining 3-4 buds. Cutting branches with heels early in the morning can increase cell activity, and a 45° oblique cut can increase the water absorption area. Soak in a 0.1% potassium permanganate solution for 15 minutes to sterilize, leaving 2-3 halved leaves at the top to reduce transpiration.
Intelligent substrate formula
Recommended formula: decomposed leaf soil: perlite: river sand = 3:1:1, with a porosity of over 35%. High-temperature sterilization in a microwave for 3 minutes can replace chemical disinfection, and the moisture content of the substrate should be controlled at 60% (holds together when squeezed, falls apart when dropped). Pre-buried slow-release fertilizer granules can provide continuous nutrients.
Scientific cutting technique
Use the "Wall crashing 2.0" cutting method: first make a hole with a bamboo stick, insert to a depth of 1/3 of the cutting, with a spacing of 8 cm. Combine with IBA 200ppm quick dip treatment and build a small arch shed to maintain 85% humidity. An intelligent temperature control system maintains a day/night temperature difference of 25°C/18°C to stimulate growth.
Environmental intelligent control
Equipped with a 70% shade net and a misting humidification system, ventilate for 20 minutes every 3 days to prevent mold. Use an EC value meter to monitor the salt content of the substrate, and gradually increase the duration of scattered light during the root development stage.
Golden season for lilac cutting
In the Jiangnan region, it is suitable to carry out from the end of June to the beginning of July during the plum rain season, when the air humidity reaches over 75% and the day-night temperature difference is ≤5°C. In the north, it can be done 30-45 days after flowering (around the end of May), combined with the semi-woody characteristics of the new shoots, avoiding the high summer temperatures.
By precisely controlling temperature, humidity, and light intensity, and using plant growth regulators, the lilac cuttings can form callus within 15-20 days and achieve a rooting rate of 90% in 35 days. Regularly spray phosphorus and potassium fertilizer on the leaves, and the plants can be transplanted after 60 days.