The newly bought cosmos does not need to be repotted.It has very low requirements for soil, general soil can grow normally, if transferred to fertile soil, and not normal maintenance, it is very easy to grow in vain.And if the soil is changed at this time, it is easy to hurt the plant.
After I just bought it, because the potting soil is relatively dry, I need to replenish water for the Persian chrysanthemum in time. First, I need to water the soil thoroughly. After that, I will not water it again within five days. After the Persian chrysanthemum adapts to the environment, I will water it normally.
During the slow potting period, it is better to place the plants in a well-ventilated and shaded position to promote the plants to better adapt to the new environment, and it is better to control the temperature between 20 and 30 deg C to help the Cosmos to better adapt to the environment.
When you just bought it back, don't apply fertilizer in a hurry, because at this time the cosmos is still in the slow pot period, the root absorption capacity is weak, if you apply fertilizer, it may burn the root, wait for it to adapt to the new environment and then apply fertilizer.