Causes and treatments for yellow leaves of Jianlan

1. Unsuitable soil

1. Reason: Jianlan needs breathable and well-drained soil. If the soil is too alkaline or too sticky, it may cause the soil to become compacted. The roots will have weaker respiration due to poor air permeability, affecting the absorption and utilization of nutrients. Insufficient energy supply to the leaves will cause the leaves to turn yellow.

2. Treatment method: It is best to change the soil, carefully remove the plant from the pot and peel off the old soil. Check the roots for damage and cut away any rot or damage. Choose sandy loam with good air permeability and drainage, and replant the Jianlan in the pot.

2. Pests and diseases

1. Reason: Jianlan may suffer from diseases, insect pests and other problems. Diseases can cause root rot, reduced stem and branch transport capacity, and cause some distal branches and leaves to turn yellow and dry. Scale insect infestation can prevent leaves from receiving sunlight, causing the insects to cover the leaves and turn yellow.

2. Treatment method: Choose appropriate medicines for treatment. If root rot occurs, remove the plant from the pot and soil, expose the roots, cut off the rotten roots, disinfect the roots, and replant them in soil. If it is an insect pest, you can use 1000 times diluted omethoate.

3. Improper fertilization

1. Reason: Jianlan has nodules on its roots, which have the function of accumulating nitrogen. However, if the nitrogen content in the fertilizer applied during a certain period is high, it will cause fertilizer damage and yellowing of the leaves.

2. Treatment method: It likes a warm climate environment and is best maintained at a temperature of around 20 degrees Celsius. It is best to maintain it in a greenhouse or greenhouse in winter. It is best to have heating or air conditioning at home when raising it, and do not place it in a low temperature environment below 10 degrees Celsius for a long time.