绿化苗木最常使用于城市园林绿化中如:城区绿化、住宅区绿化、公路绿化、荒山绿化、河堤绿化等。按照现代人的理解，园林不只是作为游憩之用，同时也具有保护和改善环境的功能。植物可以吸收二氧化碳，放出氧气，净化空气;能够在一定程度上吸收有害气体和吸附尘埃，减轻污染;可以调节空气的温度、湿度，改善小气候;还有减弱噪声和防风、防火等防护作用。尤为重要的是园林在心理上和精神上的有益作用，全国幸福感排名靠前的城市，无一不是园林城市。游憩在景色优美和安静的园林中，有助于消除长时间工作带来的紧张和疲乏，使脑力、体力得到恢复。
Green seedlings are most commonly used in urban landscape greening, such as urban greening, residential greening, highway greening, barren mountain greening, river embankment greening, etc. According to modern people's understanding, garden is not only for recreation, but also for protecting and improving the environment. Plants can absorb carbon dioxide, release oxygen and purify the air; to a certain extent, they can absorb harmful gases and dust to reduce pollution; they can adjust the temperature and humidity of the air and improve the microclimate; they can also reduce noise and prevent wind and fire. What's more important is the beneficial role of gardens in psychology and spirit. The cities ranking the top in national happiness are all garden cities. Recreation in the beautiful and quiet garden helps to eliminate the tension and fatigue caused by long-time work, and recover the mental and physical strength.