Red back osmanthus cultivation precautions

Anthracnose, leaf blight and root-knot nematode disease are common in pest control. The first two diseases can be treated by spraying 65% zinc wettable powder 500 times, and 3% carbofuran granules can be applied to the prevention and control of diseases. Red-backed cassia is easy to be harmed by scale insects, so pay attention to prevention and control.

The cultivation soil must be mixed with acid soil, and the basin should be changed every two years according to the growth situation. It is appropriate to keep it under the shade in the hot season, and applying acid liquid fertilizer every 2-3 weeks can make the branches and leaves luxuriant and keep the leaves bright.

The room temperature in winter should not be lower than 12 ℃, otherwise a large number of leaves will fall and the plants will go into dormancy, and the twigs will wither at the same time. If this happens, re-pruning should be carried out immediately to promote new shoots. Pay attention to the wind when moving out in spring, otherwise it is easy to cause the leaf to curl or even the leaf edge to dry up.

Temperature of Culture method of Osmanthus fragrans

Osmanthus fragrans is a subtropical plant, which is not cold-tolerant. The suitable temperature for growth is between 15-25 ℃, and the overwintering temperature should be not less than 5 ℃.

Light

Resistant to semi-shade, like scattered light, avoid strong light exposure, summer needs to be placed in a shaded and ventilated place, which is conducive to keeping the red back sweet-scented osmanthus leaf color thick green.

Watering

Red back sweet-scented osmanthus likes the moist growth environment, but avoid waterlogging. Fully watered during the growing period, keep the basin soil and the surrounding environment moist, but pay attention to avoid stagnant water. Control watering in winter, generally watering every 7-10 days, basin soil is slightly wet and dry.

Fertilizer application

When planting or turning the basin and changing the soil, some compound fertilizer can be applied as the base fertilizer, the compound fertilizer containing nitrogen, phosphorus and potassium can be applied once in the growing period, and 0.2% potassium dihydrogen phosphate solution can be sprayed twice during flowering. Fertilizers are not needed in midsummer and winter.

Soil

Like fertile, loose, well-drained sandy loam.

Reproduction method

Two propagation methods of root division and cuttage can be adopted. The root splitting method is generally carried out in March or April of each year, and 2-3-year-old seedlings are selected for planting. The most common is cuttage propagation, select annual strong branches as cuttings, cut into every three segments into plain soil, about 23 cm deep, shade and moisturizing about two months can take root.

Culture methods and matters needing attention of sweet-scented osmanthus

Latin name Excoecaria cochinchinensis Lour

Also known as red purple wood, purple back cinnamon

The plant kingdom.

Angiospermae, angiosperm phylum

Dicotyledonous class Dicotyledoneae

Euphorbiales (Morinda officinalis)

Suborder Euphorbia Euphorbiineae

Euphorbiaceae of Euphorbiaceae

Excoecaria.

Grow red back sweet-scented osmanthus

Widely cultivated in Taiwan, Guangdong, Guangxi, Yunnan and other places in China. There are also countries in southeastern Asia.

Section cataloging 174

Red back osmanthus is the red back sweet-scented osmanthus, it is the evergreen shrub of Euphorbiaceae, because its leaf back is red. It is a kind of foliage and flowering plant with high practical value. in the Yangtze River basin and the south of China, it is often used as a potted plant, which is placed on the windowsill, balcony or garden, and can also be used as medicine.

1. Morphological characteristics.

Evergreen shrubs, to about 1 m tall; branches glabrous, with many lenticels. Leaves opposite, sparsely alternate or nearly 3 whorled, papery, leaf blade narrowly elliptic or oblong, 6-14 cm long and 1.2-4 cm wide, apical long acuminate, base attenuate, margin sparsely denticulate, tooth spacing 3-10 mm, both surfaces glabrous, ventral green, abaxially purplish red or blood red; midrib raised on both sides, lateral veins 8-12 pairs, arcuate ascending, detached curved arch connection, reticulate venation inconspicuous. Petiole 3-10 mm long, eglandular; stipules ovate, apical, ca. 1 mm. Flowers unisexual, dioecious, gathered into axillary or sparse terminal racemes, male inflorescences 1-2 cm long, female inflorescences composed of 3-5 flowers, slightly shorter than male inflorescences. Male flowers: pedicel ca. 1.5 mm long; bracts broadly ovate, nearly equal in length and width, ca. 1.7 mm, apex protruding and denticulate, base with 1 gland on each side of ventral surface, each bract having only 1 flower; bracteoles 2, linear, ca. 1.5 mm long, apical tip, upper part with tearing denticulate, 1 gland on each side of base; sepals 3, lanceolate, ca. 1.2 mm, apical denticulate Stamens protruding beyond sepals, anthers orbicular, slightly shorter than filaments. Female flowers: pedicels stout, 1.5-2 mm long, bracts and bracteoles the same as male flowers; sepals 3, base slightly connate, ovate, 1.8 mm long, nearly 1.2 mm wide; ovary globose, glabrous, styles 3, separated or basally ±connate, ca. 2.2 mm. Capsule globose, ca. 8 mm in diam., base truncated, tip depressed; seeds subglobose, ca. 2. 5 mm in diam. The florescence is almost all year round.

2. Growth environment

Not resistant to drought, not very cold-resistant, the suitable temperature for growth is 15 ℃ 25 ℃, and the winter temperature is not lower than 5 mol. Resistant to semi-overcast, avoid sun exposure, put in the shade in summer, can keep the leaf color dark green. Requires fertile, well-drained sandy loam.

3. Distribution

Distributed in Guangdong, Guangxi, Yunnan and other southern regions of China.

4. Methods of reproduction

Because of the great demand for seedlings of Cinnamomum chinense, the method of rapid seedling raising by cutting is widely used.

The best time for cutting was before the spring buds germinated, during which the branches were rich in hormones and nutrients accumulated, and the temperature increased after cutting, and the cuttings soon produced healing tissue. If the opportunity is missed, the flower buds and autumn shoots can be cut from late July to mid-August before the spring shoots stop growing, but the shoots that germinate and grow in spring must be selected as cuttings in order to achieve the ideal survival rate.

When preparing the cuttage, choose the sunny place and dig a flat-bottomed rectangular pit with a length of 12 meters, a width of 1.2 meters and a depth of 0.7 meters. The bottom filling layer is 40 cm thick for dung storage, or other heat-generating materials, and a layer of vermiculite and perlite of 15murine 20 cm is laid on the top as the cutting substrate of the seedling bed. After cutting, build a small plastic arch shed with a height of 50 centimeters and an Arbor with a height of 1 meter. After the seedbed is done, the soil is strictly disinfected with 0.5% potassium permanganate aqueous solution to prevent the occurrence of seedling blight and rot.

During the cutting operation, the first-year autumn shoots free of diseases and insect pests are selected as cuttings, the cutting grows by 8mur10cm, the top 2mur3 leaves are retained, and then the cuttings are soaked in 0.05% of 0.1% naphthalene acetic acid solution for about 5 seconds, followed by cutting, soaking and cutting. At the time of insertion, according to the row spacing of 10 × 10 cm plants, first make a small hole with a wood (bamboo) stick, insert the cuttings, cover the substrate and then lightly compact, pour water with a fine hole spray pot, and then cover the film and grass curtain awning. The cutting method in autumn is the same as that in spring, but the temperature should be specially controlled so as not to affect the survival.

Management after insertion [temperature]: strictly control the temperature of the nursery bed at 26 ℃-28 ℃ and the air temperature at 23 ℃-25 ℃. Pay attention to the fact that the air temperature can not be higher than the ground temperature, otherwise the cuttings will take root after sprouting, or even will not take root, resulting in false living phenomenon and even withering and death.

[light]: after cuttage 7mi for 10 days, the transmittance of the Arbor reached about 30%, so that the cuttings could accept thin scattered light to facilitate leaf photosynthesis and promote the formation of healing tissue at the base of the cuttings and began to take root. When the cuttings take root, and the root length is 2mi 3cm, the film is removed and the grass curtain is removed before 11:00 and after 5pm to promote the robust growth of the seedlings.

[water and fertilizer]: after cutting, spray should be carried out at least two or three times a day, ventilation should be carried out every two or three days, the substrate should be kept moist, and the air relative humidity should be controlled at about 90%. At the same time, after the cuttings took root, 0.2% potassium dihydrogen phosphate aqueous solution was used for foliar spraying once a week to promote seedling growth.