Rough plants give people a strong, firm and vigorous feeling. There is a strong contrast between the collocation of thick and thin plants, which will produce a sense of jumping. Therefore, they can be used as the central objects in landscape design for decoration and embellishment. Plants with rough appearance will have the illusion of being close at hand, and planting them at the far end of reading glasses can shorten the reading glasses. But if you use it too much, it will appear rude and unpretentious. In addition, rough plants will make the scenery biased towards the viewer, which will cause some illusions and make the space narrow and crowded. Use with caution in narrow spaces such as hotels and courtyards.