1. The peak period of earthworm reproduction should be divided into regions. In the south, it is generally in January, February, March, April, May, October and November. In the north, it is generally in April, May, June, September and October;
2. Earthworms prefer darkness, humidity, quietness, warmth, sweetness and sourness, solitude, fear of light, shock, immersion, salt, heat, cold and heat. The activity temperature of earthworms is within the range of 5 to 30 degrees, 0 to 5 degrees into a dormant state, and die below 0 degrees. The most suitable temperature is about 20 to 27 degrees. At this time, earthworms can grow, develop and reproduce well. When the temperature is 28 to 30 degrees, it can maintain a certain growth. When the temperature is above 32 degrees, it stops growing. When the temperature is below 10 degrees, it is sluggish. When the temperature is above 40 degrees, it dies. The optimum temperature for hatching of earthworm cocoons is 18 to 27 degrees;
3. It can be seen that the highest lethal temperature of earthworm is lower than that of other invertebrates. The best place for the farm is indoors. In the south, it is ventilated and moisturized in summer. In winter, as long as the windows are closed for heat preservation, the farm can operate normally all year round.