I specialize in growing perilla. Now there is a problem. Every year from May to September, my perilla leaves turn from red to green with the high temperature.

Your perilla leaves slowly turn from red to green in hot weather, which may be caused by the following reasons:

1. temperature effect: high temperature weather may lead to the decrease of anthocyanin stability in perilla leaves, thus gradually turning green. Anthocyanin is an important pigment in perilla leaves, which is more stable under low temperature and cloudy days. Therefore, if the weather is too hot, anthocyanins may decompose, leading to lighter leaves.

2. Moisture effect: In high temperature and dry environment, perilla leaves may become thinner due to excessive water loss, which leads to the reduction of anthocyanins in leaves, thus making the leaves lighter in color. Therefore, in the hot and dry season, it is necessary to ensure that perilla plants are watered enough to keep the soil moist.

To solve this problem, you can try the following measures:

1. Proper shading: In high temperature weather, giving proper shading to perilla plants to avoid direct sunlight can reduce the thermal damage of leaves and reduce the discoloration of leaves.

2. Increase watering: In the dry season, increase watering appropriately to keep the soil moist, which helps to maintain the water and nutrient supply of leaves, thus reducing the discoloration of leaves.

3. Adjust the planting location: If possible, plant perilla in a cool and humid place to provide more suitable environmental conditions for the growth of perilla.

4. Use organic fertilizer: The use of organic fertilizer can improve the water retention capacity and nutrient supply of soil, and help perilla plants to better cope with high temperature and dry weather.

I hope these suggestions will help you grow perilla. If the problem persists or becomes more serious, it is recommended that you consult professionals or agricultural experts for more detailed advice and guidance.