Some restaurants or teahouses are decorated with flower racks , and can be used as a corridor . It is beautiful and practical . When in use , it is important to pay attention to the selection of plants and to be familiar with the characteristics and applications of anti - corrosion wood flower racks above their growth environment . In outdoor use , attention should be paid to the problem that wood is treated to control their thermal expansion and contraction properties . When used indoors , attention should be paid to cleaning methods and boiling water , so as to avoid distortion and deformation .