Dragon's blood tree evergreen shrub, up to 4 meters high, with gray bark. Leaves sessile, densely planted at the top of the stem, thick papery, wide strip or oblanceolate, length10 ~ 35cm, width1~ 5.5cm, swollen stem base, narrow near the base, obvious prismatic midrib on the lower back, large terminal panicle, 60cm long,/10 ~ 35 flowers. These flowers are white and fragrant. Berries are spherical yellow.
It belongs to many species and varieties and is used for garden viewing. Dragon's blood tree is loose in material, hollow in body and riddled with branches, so it can't be a pillar; When making a fire, it only smokes, but it doesn't catch fire, and it can't be used as firewood. It is really useless, so it is also called "mature tree".
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Plant habit
Dragon's blood tree likes high temperature and humidity, with plenty of light and bright leaves. Not hardy, the winter temperature is about 15C, and the lowest temperature is 5~ 10C. When the temperature is too low, yellow-brown patches will appear at the tip and edge of leaves due to insufficient water absorption by roots, and loose soil with good drainage and rich humus will be preferred.
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breeding method
After Dracaena Dracaena was introduced into China, except for a few tropical areas, other areas mainly used high pressure and cuttage for asexual reproduction.
Stratified propagation
The stems of Dracaena dracunculata mostly grow upright and have few branches. After several years of plant growth, the basal leaves fall off and naturally lose their ornamental value. According to this situation, captive breeders can breed under high pressure in the high temperature and high humidity season from May to July. The method is as follows: cut the appropriate part of the plant stem into a ring with the width of 1.8-2.2 cm, and peel off the cortex of the ring with a knife; Wipe off the juice overflowing from the incision with a clean wet cloth; Coating the cortex at the upper end of the incision with 5000- 1000ppm aqueous solution of naphthylacetic acid; Tie the white plastic film at the lower end of the incision, straighten it into a funnel shape, and put it in. After the high pressure of Dracaena, it is necessary to check whether the matrix is dry at any time and replenish water at any time. Generally, after 30 ~ 40 days of cultivation, new roots will appear in the girdling area, and from September to 10, they can leave the mother and be cultivated into independent plants.
cutting
Dracaena can also be propagated asexually by cutting, and the time is from May to June. At this time, it is the vigorous growth period of Dracaena, and the plants are rich in nutrition and easy to survive after cutting. Before cutting, you can choose the mother plant with high ornamental value, and take robust branches that have been growing for two years, each of which is about 10-20 cm long, with or without leaves. The base of the cuttings is cut into a flat mouth, and leaves are left after the upper part is crosscut. The upper and lower incisions can be soaked in clear water to flush the spilled juice, then placed in a cool and ventilated place for a while, and then soaked in 500- 1000ppm of naphthylacetic acid at the base of the cuttings for 2-3 cm, usually for 5 seconds, and inserted with the soaking. For the cuttage of Dracaena dracunculata, the seedbed can be a small pottery flowerpot, and the substrate can be vermiculite, perlite or high-temperature sterilized plain sand, which can be put into the pot for cuttage. One plant in each pot, water it once after it is inserted, and put the seedbed in a place where flowers are shining and carefully maintain it. The future management work is mainly to keep the substrate moist. The wound of Dracaena Dracaena heals quickly, takes root early and germinates quickly. It usually takes 15 to 20 days. Under the action of trauma hormone, the incision will produce callus. In 25 ~ 35 days, the cuttings will soon have original roots under the action of endogenous hormones, and new roots will germinate in 35 ~ 40 days. After two months, they can be transplanted into cultivated soil.
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Cultivation and maintenance
Dracaena stenophylla can be cultivated with 1 serving humus soil, peat soil and river sand under 70~80% shading. Apply compound fertilizer 1~2 times a month during the growing period, keep the soil moist, and spray more leaves in summer to improve the air humidity, so that the leaves will be thicker, brighter and less prone to drying. In winter, it is necessary to keep the temperature above 8℃, and the soil in the basin should be watered less, but it is effective to keep the color of leaves and prevent dry tips by wetting the ground frequently and increasing humidity. This plant has beautiful leaves and is a good material for all kinds of indoor decoration. If the humidity can be properly reduced before entering the room to adapt to the dry environment, and water is often sprayed on the leaves after entering the room, you can enjoy it indoors for a long time and it is not easy to dry the leaves. Some plants damaged by indoor decoration can be recovered as long as they are moved back to the production site for a period of time if the damage is not serious, while some seriously damaged plants are difficult to recover and can be used for seedling propagation; For example, it is a pity that some people throw away their leaves after they have been damaged for a while. In fact, as long as the residual branches are cut off about 2cm below the budding branches at the upper end of the stem and the routine management is continued, new branches and leaves can sprout after a period of time.
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Garden use
Dracaena is a beautiful and regular plant with colorful leaves. It is an excellent foliage plant for modern interior decoration. Small and medium-sized potted plants can decorate the study, living room and bedroom, and large and medium-sized plants can beautify and decorate the hall. Dragon's blood tree has strong adaptability to light, which can be observed continuously for 2-4 weeks in a dark room and placed in a bright room for a long time.
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education administration
Dragon's blood tree likes warmth, is afraid of cold, likes light but is afraid of sun exposure, and is most suitable for growing in a warm but not very hot environment. Spring, summer and autumn are the seasons when Dracaena Dracaena grows vigorously. During this period, breeders must fully meet their needs for water, nutrition and temperature, so that they can grow healthily.
Fertilizer and water management
Dragon's blood tree Dragon's blood tree likes the fertile and permeable substrate of cabbage pine, which can be cultivated and managed without soil. The container for cultivation should be Yixing purple sand basin, which is beautiful and elegant, or Jingdezhen ceramic basin in Jiangxi. The matrix can be fully mixed with vermiculite, perlite and peat soil. This matrix is breathable, clean, sterile and tasteless. Dragon's blood tree and this substrate can be cultivated in high-grade containers for several years without turning over pots and changing soil, with developed roots and vigorous growth. Fertilizer and water management of soilless culture is mainly topdressing nutrient solution. If the amount of cultivation is small, special nutrient solution may not be prepared, and "Hongmei" and "Jin Yue" brand nutrient solutions sold in the market may be used. According to the instructions, add appropriate amount of water, mix thoroughly and water, or dig the surface substrate every 30 to 40 days and apply granular slow-release fertilizer. Water every 3 to 5 days to keep the substrate moist. In summer, most areas are hot and dry. Every morning 10 and after 6 pm, spray water on the leaves with a fine-hole watering can to protect the beautiful and bright colors of the leaves. In winter dormancy period, fertilization should be stopped and watering should be controlled. Generally, it should be put indoors for the winter. Water can be poured once every ten days and a half months to keep the soil slightly dry and wet, so that it can survive the winter safely. dragon tree
Temperature and light
Dragon's blood tree not only likes warm, humid and sunny environment, but also can withstand shade. However, if it is kept indoors for a long time in a too cool environment, it will also cause the leaves to fade. Therefore, it is best to put the flowerpot on the windowsill in the southeast, so as to fully receive the sunlight. If the dragon's blood tree is kept on the balcony, when the sun is too strong in summer, the flowerpot should be moved indoors, especially at noon, and properly shaded, with a general illumination of 40-50% to avoid burning leaves in the hot sun. Dragon's blood tree likes warmth and is not tolerant of cold. Its optimum growth temperature is 20-28 degrees Celsius. If the summer is hot, the temperature exceeds 32 degrees Celsius, or the winter temperature is lower than 15 degrees Celsius, the Dracaena is dormant or semi-dormant. After the end of 10 in the Yangtze River valley and its south, Dracaena will be moved indoors to prevent early frost. Throughout the winter, it is best to control the room temperature between 10-20 degrees Celsius, not too low. At the same time, the potted plants should be placed on the south window sill, so that the sun can shine directly on the plants, and the orientation should be rotated regularly to make them receive light evenly. If there is no sunshine for a long time, you can turn on the light at night, and put the dragon blood tree under 40 watts of light for artificial lighting to ensure the beauty of the leaves. Put the dragon's blood tree in the curtain at night, block the cold air with thick curtains, or put the flowerpot in a warm place in the corner to safely spend the winter.
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control of insect
Because of the dry ring cultivation, if the dragon's blood tree is placed on the balcony or indoor windowsill for a long time, it is easy to grow red spiders. Red spider, commonly known as fire dragon, belongs to mite pests, which mostly cluster on the back of plant leaves, make nets to shelter and suck juice. The dragon's blood tree was damaged by it, its leaves faded, its chlorophyll was destroyed, and there were many small yellow spots on its surface, which gradually shrank, yellowed and withered, and even fell off in severe cases, losing its due ornamental value. Prevention and control methods. Starscream often hides on the back of branches and leaves or in dense places, and it is easier to catch it by artificial dragnet. If chemical treatment is adopted, 20% triclosan emulsion can be added with 800- 1000 times of water to make a solution for spraying. This medicine has a good killing effect on adults, nymphs and eggs. You can also add 1000- 1500 times of water into 50% dichlorvos emulsion to make a solution for spraying, and pay attention to spraying on the back of the leaves when spraying, so that the killing effect is better.