If the curing environment is not well adjusted and the cactus is rotten, it should be pruned first. It's better to prepare a knife to cut all the rotten stems and leaves off the plant. After that, take the plant out of the flowerpot, and use scissors to cut off its rotting and blackened roots.
Prepare some fungicides, dilute with water and pour into a small basin. Then put the whole plant in, make sure that all the cuts and cuts are below the liquid level. In this way, let stand for 20-30 minutes, complete the disinfection, and then take it out of the bactericide solution and put it in a cool place to dry.
Some new flower soils with good air permeability were made up of sapropel and river sand. Put them in the pot, stir fry and sterilize them. When they cool down, put them into a flowerpot. Then plant the sterilized plant into the soil to ensure that all its roots are buried in the soil. After that, it can be put in a warm, semi - Yin position, control water and stop fertilizer, and then it can recover.