The Reasons for Cactus Root Rot
As a representative of desert plants, cacti are known for their tenacious vitality, but root rot is a common problem during maintenance. This article systematically analyzes the six causes of root rot and provides scientific prevention and control measures to help you cultivate healthy succulents.
Environmental Control and Cactus Root Rot
Abnormal Temperature Leading to Frostbite
When the temperature drops below 5°C in winter, the fluids in the cactus cells freeze, destroying the tissue structure. It is recommended to use double-layer protection: during the day, use a glass cover to increase the local temperature by 3-5°C, and at night, cover with PE film to form a mini greenhouse, maintaining the basic temperature required for root activity.
Key Points for Seasonal Transition Management
After stopping fertilization in late autumn, it should be combined with light adjustment: shorten the daily direct sunlight time to 4 hours to gradually reduce the metabolic rate. Use an infrared thermometer to monitor the potting soil temperature, keeping it stable between 12-18°C for the best results.
Key Points for Water Management
Seasonal Watering Rules
In winter, water control should be combined with humidity monitoring. When the air humidity is >60%, extend the watering interval to 20 days/time. Use a narrow-spout pot to slowly pour water along the pot wall, avoiding soaking the base of the cactus.
Taboos for Special Shapes in Watering
For varieties with a sunken top, use a misting spray bottle, keeping the water mist particle size <0.3mm, and spray from 30cm away from the plant. Immediately use a blower to remove standing water after rain to prevent the formation of an anaerobic environment in the sunken area.
Cultivation Operation Norms
Scientific Potting Cycle
When repotting every spring for 2 years, retaining 1/3 of the original soil can reduce stress reactions. The new pot diameter should be 3-5cm larger than the cactus, using a mixed substrate of volcanic rock: vermiculite = 7:3, ensuring a porosity >40%.
Accurate Fertilization Plan
Apply slow-release fertilizer 5-8 pellets per month during the growing season, adjusting the N-P-K ratio to 2-8-5. During the winter fertilization pause, spray 50ppm seaweed acid on the leaves every half month to maintain metabolic balance.
By controlling temperature gradients, precise water supply, and regular root maintenance, cactus root rot can be effectively prevented. It is recommended to establish a maintenance log to record environmental parameters and growth status, adjusting management strategies in a timely manner.