What to Do When the Leaves of Rieger Begonia Wither and Curl
As a star variety of indoor ornamental plants, Rieger Begonia has captivated the hearts of numerous gardening enthusiasts with its vibrant flower colors. However, when the originally unfolded leaves start to curl and wither, it often leaves growers at a loss. This article will systematically analyze the four common causes and provide highly operable solutions.
I. Abnormal Leaf Symptoms Caused by Improper Water Management
1.1 Identification and Emergency Treatment of Water Deficiency
When the plant exhibits progressive withering from top to bottom, and the leaf edges show a brown curl, it is a typical sign of water deficiency. It is recommended to use the double补水 method: first, slowly water along the edge of the pot until water seeps from the bottom, then use a misting sprayer to water the leaves with warm water at 25-30°C, avoiding the high-temperature noon to prevent cell damage.
1.2 Treatment Process for Root Rot Due to Waterlogging
When the surface of the potting soil shows moss or an unpleasant odor, accompanied by the yellowing and falling of the lower leaves, it indicates excessive watering. Emergency treatment should follow the 'three cuts and three replacements' principle: cut off the rotting roots, cut off 1/3 of the damaged leaves, and trim the dense branches; replace the breathable substrate, replace the drainage pot, and change the care environment. During the recovery period, maintain a cool and ventilated environment at 18-22°C, and pause fertilization for two weeks.
II. Physiological Disorders Caused by Nutritional Imbalance
2.1 Fertilizer Damage Repair Plan
When salt crystallization or abnormal curling at the leaf tips is observed, immediately flush the soil: use five times the volume of potting soil with clear water for circulation, and use the siphon method to drain accumulated liquid. In severe cases, replace the top 1/2 of the substrate, mixing in 20% perlite to improve aeration. Simultaneously spray a 0.1% phosphorus acid potassium solution to enhance stress resistance.
2.2 Scientific Fertilizing Schedule
In the growing season (March-September), apply diluted Huaduo No. 2 at a ratio of 1:1500 every half month, and add calcium and magnesium fertilizers during the bud formation period. Stop fertilizing during the winter dormancy period to avoid salt accumulation. It is recommended to use an EC value pen to keep the soil conductivity within a safe range of 1.2-1.8mS/cm.
III. Environmental Control and Pest and Disease Prevention
3.1 Light and Temperature Management
Maintain an average of 25,000-35,000 lux scattered light per day, and shade 40%-60% in the summer. Keep the day-night temperature difference between 8-10°C, and continuous temperatures above 30°C can cause heat damage curling. It is recommended to use a smart temperature and humidity meter for monitoring, and use a humidifier to maintain 60%-70% air humidity.
3.2 Comprehensive Pest and Disease Control
Regularly check the back of the leaves and the base of the stems. For red spider mites, use matrine 1000x solution for control, and for powdery mildew, spray Luna Sen 2000x solution. Use Bacillus subtilis every quarter to prevent root rot, and for infected plants, cut off the diseased roots and disinfect with metalaxyl.
By precisely adjusting water and fertilizer management and environmental parameters, and combining regular health checks, Rieger Begonia can maintain its best ornamental state. Remember the watering principle of 'moist when dry' and the fertilizing concept of 'frequent light fertilization' to ensure that every Begonia leaf unfolds as it should.