Should Orchids Be Root-Pruned When Repotting
As a representative of perennial herbaceous plants, whether to prune the roots of orchids during repotting directly affects the rejuvenation of the plant. This article will systematically analyze the core points of root pruning for orchids during repotting, from root condition judgment, professional pruning techniques to post-care, to help orchid enthusiasts master scientific treatment methods.
Criteria for Root Pruning in Orchid Repotting
Principle of Retaining Healthy Roots
When the fleshy roots are milky white with crystal-like tips, it indicates that the orchid is in the best physiological state. Such healthy roots should be completely retained, as pruning would damage the absorption system. Determine by gentle pinching: roots that are full and elastic do not require treatment, only the tangled root mass needs to be combed.
Identifying Characteristics of Diseased Roots
When brown hollow roots (which flatten when pinched), black rot roots (with a slimy feeling), or dry shriveled roots are found, it is necessary to use a disinfected scissor to make a flat cut 1 cm above the necrotic part. Special attention should be paid to latent disease roots with annular browning, as these roots need to be thoroughly removed to prevent cross-infection.
Standard Operating Procedure for Orchid Root Pruning
Selection of Professional Tools
It is recommended to use surgical scissors or professional pruning shears with a blade thickness ≤0.5mm to ensure a smooth cut. Disinfect with 75% alcohol swabs before operation, avoiding the use of rusty tools that could cause wound contamination.
Wound Treatment Plan
Immediately after pruning, soak in a fungicide solution (800 times dilution of carbendazim) for 20 minutes, focusing on cuts with a diameter >3mm. Air-dry the roots in a shaded area until the cut surface forms a film (about 2-3 hours), and apply wood ash to enhance the antimicrobial effect.
Key Points of Scientific Care After Repotting
Technique for Watering the Rooting Plant
Use the immersion method to water, controlling the moisture content of the growing medium to 40%-50%. Adding HB101 vigor activator (1:2000) can promote the germination of new roots. Avoid directly watering with unsterilized tap water.
Environmental Control Strategy
Maintaining a day-night temperature difference of 8-10°C is beneficial for recovery, maintaining a 60% shading rate for the first two weeks. It is recommended to use a thermometer and hygrometer to monitor, with ideal values of temperature 22-28°C and humidity 65%-75%. When new buds start to grow and the leaf surface regains luster, gradually increase sunlight.
By accurately judging the root condition, standardizing the operation process, and implementing refined care management, the survival rate of orchids after repotting can reach over 95%. Regularly observe the growth of new roots and adjust the care plan according to seasonal changes to keep the orchid roots always vigorous.