Photinia fraseriensis is a colorful tree species in the southern provinces and has achieved satisfactory landscape effects in environmental beautification and greening applications. Its bright red leaves, seldom-selected land, easy planting management, strong sprouting of branches and leaves, pruning, has left the most beautiful visual effects in gardens and urban greening, and has shown a broad application prospects.
However, it has been observed that in some places, when they are planted, their lack of understanding of their growth characteristics, or environmental conditions and supporting technologies can not keep up, will shorten the time of their red leaves, or the color of the bright color can not compare with the original, and not planting The safflower wood, which has been favored for many years, can maintain a long-lasting red color. After a long period of observation, due to the growth of Photinia in some alkaline floodplain soils in Dongting Lake, the conditions of fertilizer and water are relatively good, the growth rate is fast, and after pruning, the new shoots are drawn again. And the color has begun to fade, and it must be pruned to maintain the consistency of the viewing. In addition, due to the large leaves of Photinia, the matching landscape plants are few, and it is more difficult to choose a good collocation of plants. Then, how can we use its strengths to maintain its redness by rational cultivation and avoidance of disadvantages?
First, we must choose a reasonable variety. Photinia new leaves are bright red and red leaves have a long period of time. Common varieties are red robin, red lips, rubens, and strong varieties. They are used in greening of street trees and clumps of hedges, park blocks, and chromophores. When the main varieties are used, Red Robin and Rubens should be selected. Red Robin leaf margins are more pronounced than others, with thicker cuticles, larger leaves, and brighter foliage; while Rubins leaves are smaller, and the cuticles are thinner, and the brightness is less than Red Robin. Compared with the two, due to the thicker cuticles of red Robin leaves, the sprouting of new shoots was reduced during the high temperature period in summer and autumn, but there were still some smoked leaves. From October to November, the young leaves of the new shoots were brighter and brighter. Other varieties, such as red lips, new buds and red copper, new leaves are pink, old leaves turn dark green; strong varieties have lighter leaves, red leaves last longer than other varieties, and are less than Red Robins and Rubens.
Second, pay attention to the adaptation of soil and water and fertilizer conditions. Although the selection of the Photinia fritillaria is not strict with the soil, the soil at the planting site is required to be loose and ventilated, and has certain fertility. The content of organic matter in the soil is required to reach about 2%. According to the experimental observation, the Photinia fraseri planted in the alkaline soil with good water and fertilizer conditions in the alluvial plain has a bright leaf color brightness and a length of time less than that of the Photinia fraseri grown in the slightly acidic red loam or loam soil. long. Planting in areas with high groundwater levels in the lake area, encountering low-temperature ice and snow conditions in winter, and undrainage areas where there is poor drainage, there will be a certain degree of dead seedlings, indicating that their resistance to flooding is poor. Therefore, the growth of Photinia frases requires a soil moisture content of about 20% to 35%. Insufficient supply of soil moisture will inhibit growth activities, make the leaves grow old, no new leaves grow, and the red leaf period will be shorter. Planting Photinia in the soil compacted zone requires the loosening of the soil and the timely addition of fertilizers to ensure that new shoots are harvested at the right time. Poorly growing fertilizer after pruning is beneficial to the growth of new shoots, but not excessive. Try to avoid planting in the soil that is often trampled or in the building's tuyere. Not only the growth is affected, but also the reddishness of the leaves is far less than that of Photinia frondosa grown in the slightly acidic red loam soil.
Third, we must conduct reasonable pruning in due course. Properly trimmed can improve the ventilation and light transmission conditions between the blades. Increase the ornamental quality of Photinia. Usually in early spring, early summer, before the beginning of autumn or late shoot growth, according to the conditions of planting and the growth of seedlings themselves. Trimming too late is not conducive to the growth of Photinia striata; trimming too early will trim away the good landscape. In order to promote the Photinia breviflora branching, it can be used to shape, pruning, short cut, heavy short cut and other methods. At the time of pruning, the principle is to stay weak and strong, and to properly handle the medium, to maintain the beauty of the tree. Generally cut in the section about 0.5 centimeters, do not leave the pile; too fast when the shoot tipping should be many times to facilitate the branch, to prevent dislocation and thin tall tree. Note that in the summer hot season, it is not appropriate to use short cuts or short cuts, otherwise it is difficult to restore plant growth and affect the landscape effect.
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