Rose of Sharon: It can absorb the toxic gas such as hydrogen of 2 oxidation sulfur, chlorine, chloridize.It in source of the pollution that be apart from fluorine 150 meters place can grow normally.

• 山茶：花它能抗御二氧化硫、氯化氢、铬酸和硝酸烟雾等有害物质的侵害，对大气有净化作用。