常绿杜鹃系指常绿无鳞和常绿有鳞类杜鹃，其中不少种类不仅四季常青，叶片硕大，株形优美，而且通常具有花大艳丽的特点，因此在观赏应用中可谓花叶形俱佳。迄今，常绿杜鹃在我国的栽培利用尚不甚普遍。原因在于：常绿杜鹃要求较高的空气相对湿度（７５％以上），而且在气温超 Evergreen Rhododendron refers to the evergreen scaly and evergreen scaly Rhododendron, of which many species not only evergreen, leaf gigantic, plant shape beautiful, and usually has the characteristics of large and beautiful flowers, so ornamental applications can be described as mosaic Superb shape. So far, evergreen azalea cultivation and utilization in our country is not yet widespread. The reason is: evergreen cuckoo requires a higher relative humidity (above 75%), but also in ultra-temperature