Step 1: prune dead branches, and cut off dead or yellow branches and leaves.
Step 2: take off the pot and soil, first loosen the soil with a shovel, then take out the plant, do not water within one week before preparing to take off the pot and soil.
Step 3: disinfect, dissolve the carbendazim in water, disinfect the plant.
Step 4: prune the root system, cut off the aged root system, and promote the plant to grow new root system.
Step 5: plant, plant in a flowerpot, and pour through with water, place in a ventilated place.