The latest culture methods and matters needing attention of dragon spitting beads

Longtuzhu is a climbing shrub of the genus Verbenaceae. It is a beautiful ornamental plant. Generally, potted plants grow very short due to the restriction of pruning. They are often used for greenhouse cultivation and ornamental. They can also be used as potted plants to decorate window sills and small summer courtyards, and for parks or tourist bases to build flower baskets, arches, pavilions and so on. Let's take a look at the breeding methods and matters needing attention of Longtuzhu.

The growth habit of dragon spitting pearl

Longtuzhu prefers warm, moist and sunny semi-shady environment, and is not resistant to cold. The winter temperature is not lower than 8 ℃, and the stems and leaves below 5 ℃ are easy to suffer frost injury. Light ones cause deciduous leaves, while heavy ones cause tender stems to wither. During the vegetative growth period, the temperature can be higher, the temperature is higher than 30 ℃, as long as the water supply is sufficient, it can still grow normally. The temperature of reproductive growth, that is, flowering stage, should be lower, about 17 ℃.

The propagation method of dragon spitting pearl

1. Cuttage: Dragon spitting beads cuttings are generally carried out from May to June every year, and the top twigs of strong and disease-free branches can be selected, or the lower old branches can be cut into stem segments of 8 cm and 10 cm as cuttings. The cutting bed can be made of peat, perlite, rotten leaf soil, river sand and vermiculite. The optimum cutting temperature is 21 ℃ and the bed temperature is 26 ℃. It can take root 3 weeks after cutting. If the cuttings were treated with 0.5-0.8% indolebutyric acid solution for 1-2 seconds, it could take root faster and more.

2. Sowing: the longevity of Longtuzhu seeds is short and sowed immediately after harvest. The seeds can be sowed in a shallow pot from March to April every year, and the temperature is kept at 24 ℃. Seedlings can emerge in 10 days, change pots and transplant when the seedling height is 10 cm, and bloom in the second year. But the sowing method is not easy to survive, so it is recommended to use the cutting method to propagate.

The culture method of dragon spitting pearl

1. Soil: Longtuzhu culture soil uses rich, loose and well-drained sandy loam, pot cultivation uses culture soil or peat soil and coarse sand mixed soil, the commonly used soil formula is rotten soil 4 parts, garden soil 4 parts, sandy soil 2 parts.

2. Watering: Longtuzhu is sensitive to water, and sufficient water is needed in the growing period. Stems and leaves should keep saline soil moist during the growing period, but the amount of watering should not be excessive, resulting in only long vines without flowering, even leaves yellowing and withering, roots rot and death, if branches wither, stop watering, let them recover, and sprout new leaves. Summer high temperature season should be fully watered and properly shaded. It is necessary to reduce watering in winter and make it dormant in order to survive the winter safely.

3. Illumination: Dragon Tuzhu needs sufficient light in winter and shade when the summer weather is too hot, otherwise the leaves will turn yellow. When the light is insufficient, it will cause vine growth and do not blossom. Flower bud differentiation is not affected by photoperiod, but strong light can promote flower bud differentiation and development. It should not be kept in the dark for too long. If the temperature is above 21 ℃, the flowers will fall for more than 24 hours.

4. Fertilization: Longtuzhu fertilizer should not be applied too much, once every semimonthly, once every two times in flowering season, high potassium nitrate fertilizer in "Huiyou" 20-8-20 seasons, or mature thin cake fertilizer and water every 7-10 days, 3-4 times in succession. In winter, watering is reduced and fertilization is stopped. If yellowing is found in the process of cultivation, it can be combined with topdressing and 0.2% ferrous sulfate to make the leaves gradually change from yellow to green.

5. Pruning: when Longtuzhu grows to 15 cm after cutting or sowing seedlings, cut branches 10 cm away from the basin mouth to promote the germination of sturdy new branches. During the growing period, we should strictly control the height of the branches and pay attention to topping and picking the heart, so that the branches will be neat and blossom in the future. Half a month after picking the heart, Bijiu or Daizhuangsu was applied to control the plant height so that the plant was short, leafy and flowered.

6. Change the pot: the dragon spitting beads are commonly used in pots of 12cm and 15cm, and 3 plants can be planted in each pot. Generally every 1 to 2 years to change the basin, the time to change the basin in early spring or after the flower fade. When changing the basin, first use broken tiles to cover the drainage hole, and then put a small amount of bone powder as base fertilizer, then load the new culture soil, plant good plants, and leave 2-3 cm along the mouth for fertilization and watering. After changing the basin, pour through the water, put the seedlings slowly in the shade, and then move to the sunny place for maintenance.

Matters needing attention in Longtuzhu Culture

1. Longtuzhu will give birth to leaf spot disease in the process of breeding. At first, it is just a small brown spot. If it is not treated in time, it will produce large black spots, and the leaves will wither and yellow and die. Therefore, once you find sick, you should immediately use chlorothalonil 800 times liquid, foliar spray, once every 7-8 days, 2-3 times in a row, can be basically cured.

2. The main pests of Longtuzhu are shell insects and whitefly, which can be sprayed with 1000 to 1500 times of omethoate. The leaves caused by alkali to the soil can not stretch normally, and the leaves are green and yellow, which can be irrigated with 0.2% ferrous sulfate solution. For mosaic disease and fungal disease, the diseased leaves should be removed in time, ventilation should be strengthened, and the disease can be controlled by keeping the leaves dry.