How to grow Lagerstroemia indica and Photinia rubra?

Propagation techniques of Lagerstroemia indica.

1. Lagerstroemia indica mainly propagates by sowing, cutting or dividing plants, and a large number of green seedlings are mainly propagated by seeds.

1, sowing and breeding.

In June, 5438+00-165438+10, the capsules on healthy mother plants were collected in time, dried and peeled, then sieved and carefully stored. Sow in February-March of the following spring, which can be drilled or spread in the open field. Water should be sprayed frequently after emergence to keep the soil moist. Topdressing urea 1 time per month, with the dosage of 2kg per mu. Cut the grass in time to conserve moisture. Before freezing in late June, 10, the soil should be cultivated to prevent cold and winter. In the third year, it can be planted in the field to continue cultivation, with the row spacing of 0.50 m ×0.50 m, and can be planted in the garden in the next spring.

2. Cutting propagation.

Before sprouting in spring, select 1 year-old stout branches and cut them into 15 cm long. The seedbed should be loose sandy loam with good drainage, the scion should be inserted into the soil for 2/3, and then the plastic film micro-arch shed should be used for heat preservation and shade. It can take root in 20 days. Planting in the field in the next spring and continuing to cultivate, and coming out of the garden in the third year.

3. Propagation by ramets.

Before sprouting in spring, plant the roots well.

Second, the cultivation management technology

1, water and fertilizer management. Throughout the growth period, the soil should always be moist, and water it 1 time in spring drought 15 days, and the amount of water in autumn flowering should not be too large, only water it 1 time in 20 days. Pour enough antifreeze water before winter. Because the flower buds of Lagerstroemia indica were formed that year, in order to make Lagerstroemia indica blossom every year, it is necessary to maintain sufficient fertility in the soil to facilitate the differentiation of flower buds. 2-4 kg of organic fertilizer can be applied to each plant in early spring, and a small amount of inorganic fertilizer can be applied in May-June.

2, plastic trimming. Pruning of Lagerstroemia indica is mainly in dormant period, supplemented by growing season.

1. A naturally happy shape. 3-4 large branches can be selected as main branches before Lagerstroemia indica leaves the garden, and 1-2 branches with good angle and balanced growth can be selected as side branches in the future. When pruning every year, the upper branches with large angles should be selected as extension branches, and the upper branches should be moderately shortened to expand the crown. This tree shape is easy to shape, has good air permeability and can blossom in three dimensions. This kind of tree is suitable for planting in large space.

② Stratification of trunk. This kind of tree needs obvious trunk and trunk layered shape. The main branches are evenly distributed on the trunk, generally 3-5 main branches are selected, and each main branch selects 1-2 side branches. Cut off the useless branches that disturb the tree. This kind of tree conforms to the natural development law of Lagerstroemia indica, and has a high crown, which is suitable for garden cultivation and solitary cultivation.

(3) control flowering pruning. Lagerstroemia indica forms seeds after flowering. Because it consumes a lot of nutrients in the tree, the buds on the branches can't germinate that year, and they germinate into new branches the next year after wintering. If the new shoots of Lagerstroemia speciosa are cut short at the beginning of August, all flower branches and 1/3 branches will be cut off, and fertilizer and water management will be strengthened. 3-4 buds under cuttings can form flower buds after 1 month differentiation, and can bloom again before 1 month.

④ Different pruning methods should be adopted in different garden environments. Pruned Lagerstroemia indica trees are beautiful, natural and colorful. In the garden, if matched with Qiu Shu, it is an excellent tree species to decorate autumn scenery. Planting natural and happy Lagerstroemia indica in Chi Pan and the riverside will have the scenic interest of "low flowers in the pool, small water in the pool and light flowers in the heart of the pool"; If placed in front of evergreen trees, red flowers will be more beautiful and moving in the green leaves.

Third, pest control.

The pests and diseases of Lagerstroemia indica include bituminous coal disease, powdery mildew, scale insects and aphids. Bituminous coal disease often occurs on the leaves and branches of Lagerstroemia indica, and powdery mildew often harms young leaves. 70% thiophanate-methyl wettable powder 800- 1000 times can be sprayed for 3-5 times.

Photinia rubra

Seeding and seedling raising technology of Photinia fraseri: The propagation mode of Photinia fraseri is mainly sowing, and the seeds are layered and sown in the following spring. Photinia seeds can be harvested in late June at 5438+1October, then mixed with wet sand in a flowerpot, and taken out for sowing in the middle of March of the following spring. Cutting can also be carried out in July-September or layering can be carried out in autumn. Generally no pruning or special management is required. The specific sowing method is that the soil is mixed with one third of river sand, the border is leveled, the border length is 1.3m, the row spacing is 20cm, and each border is 5 rows, and a small hoe is used to open a ditch, and the ditch is covered with the mixed soil with a depth of 2-3cm. Seedling raising in May, the spacing between plants is 20×20 cm, and the survival rate of watering is high.

Photinia rubra has the advantages of fast growth, strong germination and pruning resistance, and can sprout new buds and leaves many times a year. To ensure the ideal effect of red leaves, we should pay attention to the following points when planting.

One: Choose acidic and well-drained soil. The pH value of the soil planted by Photinia rubra is generally 6 ~ 6.5, which requires the soil to be loose, breathable and fertile. It is observed that Photinia rubra grows well in red loam. Before planting, it is necessary to dig deep tree holes and apply decomposed farm manure in the tree holes to make the organic matter content in the soil reach about 2%. After planting, loosen the soil and weed in time to improve soil permeability.

Second, properly adjust the water supply. Drainage should be done in time after rain, and water should be sprayed or watered in time when there is no rain at high temperature in summer, so as to keep the soil water content between 20% and 35%. Lack of water in soil will inhibit the growth of Photinia rubra, accelerate the aging and fading of leaves, reduce the growth of new leaves, and then shorten the viewing period of red leaves. Therefore, maintaining suitable soil moisture is the key to the conservation of Photinia rubra.

Three: fertilizer supply should be in place. Photinia rubra grows vigorously in fertile soil. If new shoots are found to grow poorly or stop growing, fertilizers should be supplemented in time. In the growing season, dilute nitrogen fertilizer should be applied every 7 days to 15 days to ensure that plants sprout in time. When planting in the garden, Photinia rubra should avoid areas that are easy to be trampled. The soil in these areas is easy to harden, which is not conducive to watering and fertilization, and then affects the growth of Photinia rubra, resulting in poor red leaves.

Four: reasonable pruning. In order to improve the ornamental value of Photinia rubra, attention must be paid to pruning. Pruning is generally carried out in early spring, early summer, early autumn before germination or in the late growth period of new shoots. The degree of pruning can be determined according to the growth of branches. In principle, it is to "remove the weak and keep the strong" to maintain the beauty of the tree. If the tree shoots too fast and too much, it should be cored many times to promote branching, otherwise the tree will be too thin and too high, which will reduce the ornamental effect. When trimming, the incision is about 0.5 cm on the node. Pay attention to supplement fertilizer after pruning to ensure the healthy growth of trees.