How do potted Lagerstroemia speciosa bloom more?

Lagerstroemia indica has strong adaptability to environmental conditions, drought resistance and cold resistance, and is not strict with soil requirements. However, planted in fertile, deep, loose and acidic soil, Lagerstroemia indica grows vigorously and blooms from July to September, which is an excellent garden ornamental flower. However, in order to make Lagerstroemia indica bloom more and improve its ornamental value in gardens, it is necessary to strengthen management and reasonable pruning at all stages of its growth. The maintenance measures that should be paid attention to in the garden are introduced as follows:

Rational fertilization If Lagerstroemia indica lacks fertilizer during its growth, it will easily lead to thinning of branches, yellowing of leaves, weakening of the whole plant growth potential and easy breeding of pests and diseases. Before germination in spring and after defoliation in autumn, dig ditches or apply decomposed base fertilizer around them, and water them in time after fertilization. Topdressing nitrogen, phosphorus and potassium compound fertilizer during the growth period, especially before flowering. Applying less nitrogen fertilizer and more phosphorus and potassium fertilizer can promote plants to bloom more, and the flowers are big and strong. Replenish phosphorus and potassium fertilizer in time after pruning residual flowers.

Regular watering Lagerstroemia speciosa is a high temperature season in summer and autumn, with long sunshine time, strong sunlight and rapid evaporation of water, so it is necessary to replenish water in time to meet its normal growth needs. Generally, water every 3 ~ 7 days in summer according to the weather conditions, and water thoroughly every time. Loosening the soil in time after drying can not only reduce water evaporation, but also prevent weeds from growing in the tree tray. In early spring, thaw and water in time, and the soil turns green.

Timely observation and control of pests and diseases Lagerstroemia indica The main pests and diseases are powdery mildew and scale insects. According to the occurrence law of various diseases and insect pests, timely observation should be made in the coming period, and timely prevention should be carried out after discovery, so as to minimize the harm of diseases and insect pests to plants.

An important disease of Lagerstroemia indica. It is mainly harmful to leaves, but also to branches, shoots, flower buds and buds, which often deform and wither leaves, and even cause the whole plant to die in severe cases. Spraying Bomei 3-4 degree stone sulfur mixture before germination in spring; Spraying 80% zineb wettable powder 500 times or 70% thiophanate-methyl 1000 times at the initial stage of the disease.

Nymphs and female adults mainly gather on the branches of leaves, twigs and branchlets to suck juice, which often causes the tree to be weak and grow poorly. Moreover, a large amount of honey dew secreted by scales will induce severe sooty blotch, and the branchlets will turn black and lose their ornamental value. During the incubation period of nymphs, 40% Su Le gum EC 1500 times or 48% chlorpyrifos EC 1200 times can be sprayed to kill nymphs.

Scientific pruning Lagerstroemia indica has strong germination ability, extremely resistant to pruning and rapid flower bud formation. Therefore, cutting off the residual flowers in time after flowering can promote the plants to shoot new branches and bloom many times. The pruning intensity can be slightly higher in early spring, and the over-dense branches, overlapping branches, over-flourishing branches, diseased branches and dead branches can be thinned out. Re-cutting the main branches, lengthening the branches and compressing the old branches can make more branches sprout and blossom in early spring. When the new shoots grow to 10cm ~ 15cm in spring, leave 8cm ~ 10cm for coring, so as to supply nutrients centrally, promote branching, and increase the amount of flowers and branches. After the first flower withers, cut off the upper part of the flower branches, leaving strong buds, so that the lower axillary buds germinate and regenerate new buds. You can bloom for the second time in about 30 days. After the flowers wither, the residual flowers can be cut off in time to accumulate nutrients and promote the differentiation of new branches and flower buds, and the third flowering can be carried out in about 30 days. Repeated pruning and timely supplementation of phosphorus and potassium fertilizer before each flowering can promote multiple flowering of plants and shorten the interval between each flowering. Can achieve the purpose of flowering many times.