When to Repot Orchids
As a representative of traditional Chinese famous flowers, the root care of orchids is directly related to the vitality of the plant. Mastering the scientific repotting cycle and operation method can not only promote the development of new roots but also effectively prevent the occurrence of diseases.
Choosing the Right Time for Repotting Orchids
Golden Season in Spring and Autumn
When the temperature is stable between 15-25°C from March to May, orchids end their dormancy and enter the growing period. Repotting at this time can be combined with the division operation, and the roots can recover 40% faster in a moist environment. From September to October, with the increase of day and night temperature difference, changing the planting material can store sufficient nutrients for overwintering.
Principles to Avoid Special Climates
When the temperature is consistently above 30°C or below 10°C, the orchid metabolism slows down, and repotting can easily cause root rot. The plum rain season in the south (air humidity >85%) also requires delaying the operation to avoid the risk of fungal growth.
Scientific Proportion of Orchid Planting Material
Three Elements of a Breathable Substrate
Quality planting material should include three basic materials: bark (40%), volcanic rock (30%), and decomposed leaf soil (20%), with particle diameter controlled between 0.5-1.5 cm. Adding 5% bamboo charcoal can adjust the pH value to the ideal range of 5.5-6.5.
Four-Step Sterilization and Disinfection Method
The old planting material needs to go through four steps: boiling water soaking → sun exposure → potassium permanganate solution disinfection → drying. For new purchased material, it is recommended to use a microwave oven to heat it on medium power for 3 minutes to kill eggs.
Standard Repotting Procedures for Orchids
Root Treatment Techniques
After removing the pot, gently tap the root ball, retaining 1/3 of the protective soil. When cutting off black and rotting roots, leave 0.5 cm of residual roots and apply charcoal powder to prevent infection. Use a bamboo skewer to comb the winding roots in the same direction to avoid violent separation.
Key Points for Potting and Care
Use the "three fill and two shake" method: first, place a 3 cm drainage layer, then fill the planting material to 1/3 and gently shake the pot wall, repeating the operation until the base of the pseudobulb. After repotting, place it in a shaded area to let the seedlings recover for 15 days, during which time, spray the leaves to maintain humidity.
Scientific repotting is a key measure for orchid rejuvenation, combined with seasonal characteristics and plant status to develop a care plan. Regularly observe the soil compaction situation, and when the pH value exceeds 7 or white salt deposits appear, promptly update the planting material to create a continuously healthy growing environment for orchids.