1. Reason: The cactus is drought-resistant and not moisture-resistant, and is afraid of waterlogging.If too much watering or not timely drainage after rain, resulting in soil water accumulation, resulting in root damage, yellow leaves.
2. Treatment method: Stop watering immediately, remove the plant from the pot at the same time, cut off the rotten root system and yellow leaves, and then plant it into the soil with good air permeability for maintenance.

1. Reason: Fertilizer needs to be applied regularly during the growth of cactus to ensure the normal growth of plants.If fertilization is not applied for a long time or too little, it will lack nutrition, grow poorly and appear yellow leaves.
2. Treatment method: Base fertilizer should be applied at the bottom of the pot, and fermented organic fertilizer and liquid fertilizer should be irrigated once every half month to provide nutrients for it and help it recover.

1. Reason: If the temperature is too low, it is easy to cause the root system of the cactus to rot, but if the temperature is too high, it is easy to cause the damage of scale insects, which will lead to the yellow leaves of the plant.
2. Treatment method: The temperature around the plant should be regulated and controlled, the temperature around the plant should be kept above 20 in the daytime, and the temperature at night should not be lower than 10 .
