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Cultivation techniques of Lagerstroemia speciosa

1 Seeding and seedling raising

11-65438+February, harvest the seeds and store them dry. Sowing in February-March of the following year, soaking in warm water at 40-50℃ for 2-4 hours, furrowing and sowing on sandy loam seedbed, and covering with soil and grass after sowing. Shade the seedlings after emergence. When the seedlings grow to a height of 3 cm, the seedling spacing is 10- 15 cm. Topdressing 2-3 times in June-August, watering in time, loosening soil and weeding. At that time, the height of seedlings could reach 50-60 cm, so the north should be protected from cold and winter. In order to ensure safety, the seedlings should be dug out in autumn to leave roots, moved to the nursery in the next spring to continue cultivation, and transplanted and planted in the early spring of the third year.

2 cuttage seedling raising

Before germination in early spring, use 1 annual branches for cutting, the cutting length is 15 cm, insert the basic steps into the seedbed, and pay attention to water spraying and moisturizing. The survival rate can reach more than 90%. After survival, take out and culture. It can also be used for cutting semi-lignified new shoots in summer, which needs to be carried out under the conditions of closed moisture preservation and shading and cooling in plastic greenhouse, or under the condition of full illumination of electronic leaf gap spray. The pests and diseases of Lagerstroemia speciosa are mainly aphids, and locusts also eat leaves. If the fertilizer and water are properly managed, it is generally not easy to get sick. Aphids and locusts can be controlled by omethoate and pyrethroids.