The seedlings of three-year-old evergreen rhododendron, like those of deciduous rhododendron 1 ~ 3-year-old, mainly focus on pinching, aiming at accelerating the growth of rhododendron and forming a good dendrite skeleton as soon as possible. When the new buds grow to 5 ~ 6 cm long, the heart can be removed to stimulate the germination of side branches. Generally, 2 ~ 3 branches can grow after coring, up to 4 ~ 5 branches at most. In order to enlarge the crown, it is advisable to leave 2 ~ 3 branches. In the second year, when each new branch grows to 4-5, the core is removed, and then 2-3 branches are kept, so that after the third year, it can reach more than 20 branches, and the tree body is basically formed. During this period, the evergreen rhododendron has not yet formed flower buds, while the deciduous rhododendron has blossomed, so most of the flower buds formed on the branchlets are removed to concentrate nutrition and make the branches full and powerful. Generally, the seeds are picked once a year, and if the nutrients can keep up, they can be picked 2 ~ 3 times in a row. With insufficient nutrients, the branches will become thinner and shorter, the growth will become weaker, and the tree structure will be unstable. The so-called haste makes waste. Among the rhododendrons in the west, the branches of Guan and Hong Niao are short, such as too many branches and the crown is not developed; Queen Rose, Amy, etc. have long hair branches, so they can stay more appropriately; For varieties with sparse recurrent branches, thinning is not needed. Therefore, pruning should be combined with the individuality of species and varieties and applied flexibly.

The skeleton of evergreen rhododendron trees over 5 years old is still small, and it still needs to be cored every year, and it will basically take shape after 6 ~ 7 years; However, the skeleton of 4-5-year-old Xi Juan tree has been initially formed, but it is not perfect. When pruning, adjust the skeleton by thinning branches and cutting them short, and peel off buds and flowers properly when flowering, so as to continue to cultivate beautiful trees.

Most evergreen rhododendrons can only bloom for more than 6 years, and at this time they have entered the vigorous growth period; For trees over 5 years old, because the tree shape is basically fixed, the plants begin to enter the full flowering period. The purpose of pruning is to improve the tree shape and maintain normal growth and flowering. The method is to combine thinning branches with thinning flowers, cut off those branches that hinder the tree shape, and properly peel off some buds (especially weak plants) to prevent excessive flowering from affecting the germination of new branches and even causing the phenomenon of flower year. /kloc-plants over 0/0 years old, with open crown, plump figure and more than 100 flowers. Pruning is mainly for thinning branches and flowers to maintain good shape and normal growth. For some old trees whose branches are getting worse year by year, strong branches and short branches can be used to promote their rejuvenation, and long branches with good growth parts can be cultivated to replace old and weak branches or make up for crown vacancy.

The pruning of rhododendron follows the law of plant addition and subtraction. Strong varieties, the more you cut, the more you add. For old trees, the more you cut, the less you add. Therefore, the old azaleas should be pruned properly to restore their vitality.