What Causes Root Rot in Phalaenopsis Orchids
As a perennial epiphytic orchid, Phalaenopsis orchids have become a new favorite in home greenery due to their elegant flower posture. However, root rot is a common problem in their care, which not only causes the leaves to wilt and turn yellow but can lead to the entire plant dying. This article will deeply analyze the three main causes of root rot and provide a step-by-step rescue plan to help you restore the vibrant Phalaenopsis orchids.
Three Main Causes of Root Rot in Phalaenopsis Orchids
1. Excessive Watering Causes Water Damage
Phalaenopsis orchids have aerial roots with water storage functions, and it is recommended to use the "dry-wet alternating method" for care. Water should be added only when the surface of the substrate is dry and white, and积水 for more than 48 hours will hinder oxygen exchange. Special reminder: In winter, the watering interval should be extended to 10-15 days/occasion.
2. Fertilizer Burn Damages Root Tissue
Water-soluble fertilizer concentration should be controlled above 3000 times, and only once a month during the growing season is needed. Uncomposted organic fertilizers release ammonia that can damage roots; it is recommended to use special slow-release orchid fertilizer, with additional foliar application of potassium dihydrogen phosphate for better results.
3. Substrate Compaction Causes Suffocation
The ideal growing substrate should contain a golden ratio of pine bark (60%), perlite (20%), and moss (20%). The planting material must be changed every two years, as aging substrates can acidify and compact, and the pH should be maintained between 5.5-6.5.
Four Steps to Revive Root-Rotted Phalaenopsis Orchids
1. Precise Root Pruning Operation
Use a pruning shear sanitized with alcohol and make an oblique cut 2 cm above the腐烂 tissue. The healthy roots should be silver-white and plump in texture. After treatment, soak in a carbendazim solution (1:1000) for 30 minutes and let the roots air-dry for 24 hours until the cut surface forms a film.
2. Intelligent Potting Care Techniques
Choose a transparent pot with side holes to observe the root condition easily. When potting, wrap the roots with fresh moss, keeping the base 1 cm suspended. Place the plant in a散射光 environment at 25°C for the first two weeks, and gradually increase the light after new roots emerge.
Through systematic diagnosis and scientific treatment, 85% of root-rotted plants can recover. It is recommended to check the substrate moisture monthly during daily care and use a moisture meter for precise management, keeping the Phalaenopsis orchid roots in a healthy state.