Causes and treatments for yellowing coriander leaves

1. The temperature is too high

1. Reason: Coriander is not resistant to high temperatures. Once the temperature exceeds 20 degrees, coriander will grow very slowly. If the temperature reaches 30 degrees, coriander will stop growing and its leaves will turn yellow and white.

2. Treatment method: If the temperature is too high, make some appropriate temperature adjustments, and then lower the temperature as soon as possible to a temperature suitable for coriander growth, preferably around 18 degrees.

2. Excessive fertilization

1. Reason: The base fertilizer was not fermented and decomposed, which generated a lot of heat, or too much compound fertilizer was applied, which led to root burn and caused the coriander leaves to turn yellow and white.

2. Treatment method: Stop fertilizing first, then fill the soil with water to let the excess fertilizer flow out of the pot with the water. Don't apply too much fertilizer in the later stage, just an appropriate amount will do.

3. Pests

1. Reason: Coriander may also be susceptible to diseases and pests, such as red spider mites. Red spider mites will suck the juice from the back of coriander leaves, causing the entire leaf to turn yellow and white.

2. Treatment method: You can spray more foliar fertilizer to increase the resistance of coriander. After being infested with insects, chemical insecticides need to be sprayed for treatment.