The main reasons for the falling leaves of gardenia after blooming are the improper comprehensive reasons such as too wet pot soil, poor ventilation and insufficient light. Don't maintain in bad environment after defoliation, which will lead to root rot and leaf curl, although the harm of whitefly and tetranychus urticae can not be ruled out, or the pH of soil and water in the basin is greater than 6.5, which will lead to the whitening of new leaves; It is not difficult to strengthen ventilation and lighting during maintenance, and to maintain the basin soil when it is wet or dry in winter; When the pH value of water and soil is greater than 6.5, it can be irrigated with alum fertilizer water once every 15 ~ 20 days, and the new leaves can turn green and stretch. Plants that have been potted for many years without changing soil should be moved out of the pot area to change soil, that is, to restore good growth.