Introduction to sparse propagation and cultivation techniques and control of diseases and insect pests of Artemisia mandshurica

Artemisia angustifolia is a kind of shrub, petals are white, with oblong or Obovate oblong, is a kind of light-loving, slightly shade-tolerant, cold-tolerant, drought-tolerant plant. So how do you cultivate and reproduce? Let's take a look at the introduction of sparse propagation and cultivation techniques and pest control of Artemisia mandshurica.

I. sparse propagation of Artemisia mandshurica

1. Sowing and reproduction

The seeds are harvested after maturity in autumn, dried and shelled, and pure seeds are obtained by removing sundries. the seeds are dried and refrigerated. Sowing seeds in the following spring, soaking seeds before sowing, the sowing rate is 20 ~ 30g per square meter. Covered with soil 1cm after sowing, the bed is covered with fine grass chips or sawdust, moisturizing and heat preservation to facilitate seedling emergence.

2. Cuttage propagation

Generally use softwood cuttings. From June to July, cut off the slightly lignified twigs, cut off the cuttings that grew about 15cm, left 2 or 3 leaves on them, and inserted them into the pre-leveled seedbed. The row spacing of the cuttings was 10cm × 20cm. Immediately after cutting, water should be irrigated once, then covered with plastic film, and shaded by a curtain built on the seedbed. Water should be watered once a day after cutting to keep the seedbed moist. When the temperature is high at noon, the plastic film at both ends of the nursery bed can be opened to avoid excessive temperature in the bed.

3. Root-splitting propagation

In order to obtain more and better tillering seedlings, the expected effect can also be achieved by increasing the fertilizer and water management of the mother tree of the tiller. The specific method is to dig a trench with a depth of 30 ~ 40cm along the 50 ~ 100cm of the mother tree, evenly apply the rotten farm organic fertilizer 25kg into the ditch, and cover the original soil, and there will be a lot of tillers for planting in the next year.

Second, sparse cultivation of Artemisia mandshurica

1. Planting time

Transplant can be cultivated in spring and autumn, but in North China, late autumn and early winter is better than spring, easy to survive, large seedlings can carry lodging soil. Compost should be applied to each hole when planting, and attention should be paid to drainage in rainy season.

2. Planting method

The diameter of the sparse tree pit is 60 ~ 80cm and the depth is 45 ~ 50cm. The bottom of the pit should be filled with nitrogen, phosphorus and potassium compound fertilizer, and then the planting soil should be backfilled, compacted and watered once.

3. Water and fertilizer management

Dazhuasu is more resistant to drought, not resistant to waterlogging, and should not be watered much. It can be irrigated twice from spring germination to flowering. The drought can be irrigated for 2 ~ 3 times in summer and 1 ~ 2 times from autumn to frost. Pay attention to drainage in the rainy season. Except that 2-3 spades of rotten compost should be applied to each plant at the time of planting, there can be no more topdressing.

4. Integer pruning

The remaining flowers should be pruned after fade, and withered, overdense and diseased branches should be cut off after falling leaves. The life span of the sparse twigs is relatively short, which usually dries up in 1 ~ 2 years, so it should be renewed and pruned at the end of autumn and the beginning of winter every year, that is, all the dried parts should be cut off to promote the lower dry branches to pull out again. Branches that are too dense should also be cut off when pruning. After pruning, the plant will grow vigorously and spend more in the second year.

5. Pest control

There are few diseases and insect pests, mainly caused by aphids. When they occur, 1.2% bitter tobacco EC 800cm 1000 times, or 6% imidacloprid EC 3000 ~ 4000 times, or 5% acetamiprid EC 5000 ~ 6000 times, etc., can be sprayed on the leaves.

The above is about the cultivation and reproduction technology of Artemisia mandshurica, the beautiful and lovely flowers can not only be watched, but also its fruit can be used as medicine, which is a kind of plant with great cultivation prospect.

Shu Shu

Saxifraga is a deciduous shrub of Saxifragaceae. Like light, slightly resistant to overcast. Like warm and humid climate, but hardy. Drought tolerance, lax requirements on the soil, good humus-rich, PH6-8 soil. Strong sex, strong sprouting, resistant to pruning. The requirement of soil quality is not strict, but the soil which is rich in organic matter and well drained is suitable. The bark flakes off. Branchlets hollow, reddish brown, stellate pilose when young. Erect panicle, 5 cm~12cm long, 5 petals, white or slightly reddish outside. In early summer, the white flowers are full of trees, clean and elegant, and the double petal variety is more beautiful. Gardens at home and abroad have been cultivated for a long time. It should be planted on lawns, roadsides, hillsides and forest edges, and can also be used as planting materials for flower hedges and rock gardens. Flower branches can be used for vase and ornamental, and roots, leaves and fruits can be used medicinally.

Aquaculture method of sparse fish

Cutting, sowing, striping or split propagation can be done.

Cuttage

It is very easy to survive. It can be inserted with soft wood in June and July and can take root in half a month. It can also be inserted with hard wood before sprouting in spring, and the survival rate can reach 90%. Transplantation should be carried out in the deciduous stage. The withered branches should be trimmed every winter or early spring after planting. The remaining inflorescences should be cut off in time after the flowers are faded. The seeds were sown and collected from October to November, dried and threshed in the sun, sealed and stored, and sowed in the following spring.

Sowing seeds

Sowing or strip sowing, strip spacing 12~15cm, seed use per mu is about 0.25kg. Cover the soil with no seeds, cover the grass after sowing, uncover the grass to cover the shade after the seedlings are unearthed. The growth of seedlings is slow, and the height of 1-year-old seedlings is about 20cm. It needs to stay in the nursery for 3-4 years before it can be planted out of the nursery. Shu Shu can be managed extensively in the garden. Because of the short life span of branchlets, the plant should be re-cut and renewed after a few years, which can promote exuberant growth and more flowering.

Prevention and control of diseases and insect pests

There are occasional red spiders and aphids, which can be controlled by spraying dichlorvos 1200-1500 times, or 1500 times of dimethoate.

Common varieties of Shu Shu:

1) double cv.plena. Leaves obtusely serrulate. There is a blush outside the bud, the flower is double, the petals are white after opening, and the outer petals of the outer wheel are dyed purplish red.

2) Magnolia (D. × magnifica), a hybrid with a plant height of more than 2 meters. Leaves ovate-oblong or oblong. Double white flowers.

3) Deutzia parviflora Bunge: shrubs, 1-2 m tall. Bark grayish brown, peeling; branchlets brown, scattered stellate hairs, old branches gray, lobed. Buds ovate-conical, fusiform, with brown scales, densely stellate hairs. Leaves opposite, petiole 3-5 mm long; leaf blade ovate, narrowly ovate or Obovate, 3.5-8 cm long and 2-5 cm wide, base broadly cuneate or rounded, apex acuminate, margin irregularly serrate, surface dark green, with 5-6 radial stellate hairs, abaxially homochromatic, scattered 8-12 stellate hairs, simple hairs along main veins. Inflorescences corymbose, 2-5 cm in diam., pedicels and calyx densely stellate hairy, calyx campanulate, calyx lobes 5, broadly ovate, relatively short; petals 5, white, Obovate, 4-6 mm long, with stellate hairs; stamens 10, filaments distally short-toothed; ovary inferior, styles 3, shorter than stamens, persistent. Capsule oblate, 2-3 mm long, 3-4 mm wide, much divided into 3 valves, outer covered with stellate hairs. Seeds numerous, minute. The florescence is June and the fruiting period is from August to September. Born on the edge of a broad-leaved forest or in bushes. It is distributed in Northeast and North China, as well as in Russia and Korea. Plant garden trees for viewing.

Photo 4) Deutziagrandifiora: deciduous shrub, 2m high. Leaves ovate, long 2.5~5cm, apex acute or shortly acuminate, base rounded, margin denticulate. The flowers are white, 2.5 cm 3 cm in diameter and 1 cm 3 cymose. The flowering period is April and the fruit ripening period is June. Wild hillside thickets, distributed in Liaoning, Inner Mongolia,

Hebei

, Shaanxi, Shandong, Hubei and other provinces.

5) Deutzia crenata'Nikko': also known as Scutellaria angustifolia, which originated in Japan and is now widely cultivated in East China. Its variety 'D.gracilis' Nikko' was successfully bred in Japan in 1976. At that time, it was named Deutzia Nakaiana 'Nikko', and changed its name to Deutzia crenata var.Nakaiana' Nikko', in 1980. Later, taxonomists such as G.Meyer officially named it Deutzia gracilis' Nikko'. This variety is famous for its low, plump plant type and luxuriant flowering. It is an excellent material for greening and beautification, and it is one of the best horticultural varieties. 'Snowball'is a deciduous shrub with a height of 30 cm, a crown width of 60 cm, a soft branch and a hemispherical plant type. Leaves opposite, lanceolate, 3-6 cm long, bright green, red in autumn. Flowering in Shanghai from April to May, the panicle is 10-15 cm long, the full flowering period is 10-15 days, the floret is white, star-shaped, the flower diameter is about 1.5 cm, extremely luxuriant. When it is in bloom, the white flowers are densely covered with a hemispherical crown, so it is named Snowball.

6) Deutzia discolor Hemsl is also called Bai Hua Shu. Shrubs, 1-3 m tall; branchlets sparsely stellate hairy. Leaves opposite, shortly stipitate; leaf blade ovate-rectangular or lanceolate, 2.5-9.5 cm long and 1-3 cm wide, base broadly cuneate or cuneate, apex acuminate or acute, margin serrulate, upper sparsely stellate hairs (with 4-5 radiations), white below, densely dense stellate hairs (with 7-12 radiations). Inflorescences corymbose; calyx tube densely stellate hairy, 2.5-3 mm long, lobes 5, lanceolate, 3-5 mm long; petals 5, white, narrowly Obovate, 0.9-1.2 cm long; stamens 10, all filaments distally 2-toothed; ovary inferior, styles 3-4. Capsule subglobose, 5-6 mm in diam. Distributed in Sichuan (east), Hubei, Shaanxi (south), Henan (southwest), Yunnan. Born on the edge of a mountain forest at an altitude of 1300-1900 meters.

7) Saxifragaceae: deciduous shrub, 1-1.3m high. Old branches dark gray, branchlets brown, sparsely stellate hairy. Leaves opposite; petiole 4-8mm long; leaf blade elliptic, 3-10cm long. 2. 5-6cm wide, apex acuminate, base rounded or broadly cuneate, margin serrulate, green above, scattered stellate hairs, light below, stellate hairs with 5-7 radiations, no central long radiations, no simple hairs on leaf veins. Corymbose inflorescences, arising from apices of branches, flowers numerous; pedicels and calyx covered with stellate hairs; calyx tube ca. 5 2mm lobes, broadly ovate; petals 5, white, apical ovate; stamens 10, filaments toothless or inconspicuously obtuse-toothed; ovary 1, style 3. Capsule. Huaxi is from July to August and the fruiting period is from August to September.

Guide to flower reproduction and management in December

Weather characteristics in December: winter has entered in most parts of our country this month, and the weather is getting colder. The snowfall in China has increased from north to south, the temperature in Jianghuai and Jiangnan has dropped to below zero one after another, and the frost is frequent. The maintenance of flowers and trees this month should pay attention to three aspects: first, to do a good job in the heat preservation and anti-freezing of flowers and trees in greenhouses, greenhouses and rooms, and second, to do a good job in pruning and cleaning flowers and trees in the open field and fertilizing the fields. The third is to do a good job in the preparation of compost organic fertilizer and preparation of cultivated soil.

I. Flower reproduction

1. Sowing seeds

The flower species that can be sown in the greenhouse in December are: big rock tree, asparagus, gentleman orchid, bulbous begonia, cyclamen, winter coral, African chrysanthemum and so on; the flowers and trees that can be sown outdoors or sand hide are: rose (such as Elizabeth), celadon, rich seeds, holly, fire thorns, palms, privet, camphor, lobular privet, disease-free son, heather, wood heather and so on.

two。 Cuttage

The woody ornamental flowers and trees that can be cut in the open field in December are plum blossom (mainly palace powder, green calyx, etc.), rose (mainly Elizabeth, abundant rose, miniature rose, etc.). Red leaf plum, wax plum (with heel cutting), Spiraea, yellow poplar and so on. Among them, yellow soil should be used for cutting plum blossom and red leaf plum, mixed substrate of rice chaff ash and fine sand 2 ∶ 1 should be used for rose cutting, and general sandy soil should be used for other kinds of cutting, which can be covered with plastic film to keep heat and moisture.

In the greenhouse, African violets can be propagated in leaves; combined with pruning, mulberry, geranium, lotus, epiphyllum, gemstone, stone lotus, purslane, rooting, longevity flowers, golden bracts, shrimp flowers, four seasons begonia, bamboo begonia, Rieger begonia, pearl orchid, jasmine, Longtuzhu, five-colored plum, goose palm wood, Ruixiang, green apple, Zhu Jiao and so on. Using cold room seedbed, gardenia, Jinxin (Phnom Penh) boxwood, ten meritorious services, hypericum, Admiralty, Yingchun, Luohansong, Luohanbai, June snow, firethorn, silver bud willow, three branches and so on can be propagated by cutting. In addition, branches such as Lingxiao, cloves and grapes can be cut for sand storage and cut again next spring.

3. Grafting

Fine varieties of plum blossom, such as bone red and cinnabar, can use the seedlings of apricot, fruit plum and peach sown in the same year in December to dig up the rootstocks and then split or cut them, then plant them on the seedling bed according to a certain row spacing, bury the soil above the grafting site, or even cover most of the grafted ear, pay attention not to infiltrate into the joint when watering, cover the plastic film to keep warm and wet, and then remove the covered plastic film after the scion sprouts in spring. Use the excavated wild rose plant to bud the rose of the superior variety, or use the robust branch segment of the Elizabeth rose variety (10 to 12 cm long) to cut or split the scion of the superior variety at the top, and then sow the grafted Elizabeth ear segment into a loose seedbed. The grafting part can be buried in the sandy soil, do not infiltrate into the interface when watering, cover the plastic film to keep moisture and heat preservation, remove the covered plastic film after the scion sprouts in the next spring, and then cut the binding belt of the joint with a blade after it is completely alive. In addition, it can also be bagged indoors to moisturize the abdomen and connect the red maple.

4. Pressing strip

The feasible species of flowers and trees for strip propagation in December are: Luohansong, plum blossoms, camellias, sweet-scented osmanthus, Michelia, pedicel begonia, purple magnolia, snowballs, brocade flowers, gardenia, Yingchun, Admiralty, eight immortal flowers, hemp leaf hydrangea, Qionghua, snow spray, pomegranate and so on.

5. Ramet

The herbaceous flower species that can be propagated in December are: onion orchid, Ophiopogon japonicus, auspicious grass, hairpin, purple calyx, safflower grass, one-leaf orchid, Jian orchid, spring orchid, cymbidium, kidney fern, shoot stem, iris, big leaf Ophiopogon japonicus, along the steps, evergreen, rooting, Guangdong evergreen. The offspring at the base of the ramet cut from the large colored leaf pineapple must be small plants that have grown on the mother plant for three or four months, otherwise the color bands of the cut offspring are easy to disappear, which should be paid special attention.

The species of woody ornamental plants that can be propagated in December are: Phyllostachys pubescens, Hypericum, Ten Gonglao, Begonia, Brown Bamboo, Safflower Spiraea, Golden Finch, Golden Bell, Yingchun, Jasmine, Jasmine, Magnolia, Gardenia, sisal, Phoenix tail Bamboo, Phyllostachys pubescens and so on.

2. Seed harvesting

The grass flower seeds that can be harvested in December are generally the species of grass flowers transferred in the greenhouse or cold room, such as a string of red, thousand-day red, marigold, malachite, cyclamen, gentleman orchid and so on. The seeds of Cymbidium should be sown as they are picked.

The main woody ornamental plants that can collect seeds in December are: rose, wisteria, privet, lobular privet, pyracantha, rich seeds, holly, camphor, and heather. After treatment, these seeds are basically required to sprout in sand and can not be sown until the seeds are white in the coming year. Under dry storage, it is easy to lose vitality, resulting in the failure of sowing and breeding in the coming year.

III. Transplanting and planting

The herbaceous flowers that can be planted in flower beds and flower beds in December are: carnation, kale, pansy, goldfish grass, calendula, daisies and so on. Some grass flowers can also be put in the greenhouse after potting, such as daisies, calendula, goldfish grass, kale, carnation, pansy and so on, which can be used for street display next spring.

In December, most deciduous greening trees and shrubs can be transplant, such as hibiscus, pomegranate, bauhinia, begonia, wax plum, plum blossom, white magnolia, purple magnolia, disease-free son, Luan tree, acacia tree, seven-leaf tree, red leaf plum, cherry blossom, papaya, two Arbor magnolia, crape myrtle, wisteria, Lingxiao, Linden, Liriodendron, red maple, blue peach, Robinia pseudoacacia, etc. On the other hand, the transplanting of evergreen trees and shrubs should be more cautious. the evergreen species that can be transplanted in winter are: privet, sweet-scented osmanthus, palm, Magnolia, camphor, rhododendron, holly and so on. When transplanting, we should first cut the strength of the main shoots and branches and delete most of the leaves. At the same time, we also need to bring large soil balls, the trunk is bound with grass rope to cover the plastic film, the trunk and big branches are cut to seal wax or film, so as to reduce water transpiration. After transplanting, we should often spray water on the leaves and tree trunks in order to ensure their normal survival.

The stumps and flowers that can be put on the pot in December are: plum blossom, wax plum pile, camellia, tea plum, pedicel begonia, vertical silk begonia. It is expected to blossom during the Spring Festival by putting it in the greenhouse and promoting the flowering treatment.

In December, potted hyacinths, tulips and daffodils continue to be put in the shed to promote flowering, which can promote their flowering before and after the Spring Festival.

1. Guard against cold

In a simple plastic greenhouse with a temperature of no less than 0 ℃, the following ornamental plants can be placed without freezing damage, such as Penglai pine, Tianmeng, one-leaf orchid, star anise plate, coral of golden peach leaves, sunflower, kidney fern, palm bamboo, Phyllostachys pubescens, Michelia, rich seeds, fire thorns, camellias, spring orchids, cymbidium, Phoenix tail bamboo, Phyllostachys pubescens, cycads, etc.

Ornamental plant species with an overwintering temperature of not less than 5 ℃, such as southern fir, goose palm wood, rubber tree, jasmine, brandy, pearl orchid, pocket coconut, calla lily, spring feather, tortoise back bamboo, Jianlan, Mulan, Belgian rhododendron, triangular flower, cyclamen, primrose, five-colored plum, kumquat, daidai, lemon, loose-tailed anemone, geranium, mulberry, Buddha belly bamboo, etc., can overwinter in a double-layer plastic greenhouse. For the species requiring a winter temperature of not less than 10 ℃, such as variable leaf wood, taro, pepper grass, bamboo taro, rich bamboo, fishtail sunflower, Brazilian iron, rich tree, reticulate grass, pineapple, pink leaf, poinsettia, Cymbidium, Longtuzhu, golden bract, Milan, Phalaenopsis, Cartland, Magnolia, South American iron tree, red (green) gemstone, Oncidium, tiger orchid, etc., in a double-layer greenhouse with good sealing performance. It is also necessary to heat it up properly. in the particularly cold period, from 4: 00 p.m. to 9: 00 the next day, put a grass curtain on the roof of the greenhouse, and then remove it until the temperature gets warmer.

For those more hardy potted and bonsai plant species, such as wax plum, plum blossom, begonia, Yingshanhong, pomegranate, hammer elm, sparrow plum, oak, crape myrtle, wisteria, yellow poplar, Luohansong, triangular maple, Cuibai, garden cypress, red cypress, bayberry, Chinese wolfberry, white wax, etc., generally will not be frozen when not less than-10 ℃; in particularly cold weather, cover with plastic film or soft grass to prevent cold.

Whether it is put in the greenhouse, greenhouse, or placed in the bedroom bonsai, potted flowers and foliage, fruit plants, in addition to maintaining the appropriate indoor temperature, but also pay attention to ventilation, can be in the highest temperature of the day around noon to open doors and windows to give ventilation, to prevent the occurrence of fallen leaves, flowers and fruits. In the ventilation, we must also pay attention not to let the cold air directly attack the plant, so as to avoid adverse reactions.

two。 Watering

For most of the potted flowers and bonsai placed in the greenhouse, greenhouse and bedroom, the degree is to keep the basin soil moist. If the temperature is too low and watered too much, it is easy to cause rotting roots. When the temperature rises, the amount of water can be increased and proper foliar spray can be given.

For those potted flowers that blossom before and after the Spring Festival, such as camellia, tea plum, Belgian rhododendron, plum blossom, wax plum, melon chrysanthemum, primrose, longevity flower, hyacinth, European daffodil, etc., ornamental fruits such as daidai, lemon, bergamot, tangerine, golden bean, winter coral, rich seeds, Phyllostachys pubescens, etc., should not only keep the potted soil moist, but also spray the leaves to facilitate the expansion of flower buds. It can also increase the freshness of flowers and fruits.

For most foliage plants in the shelving room, we should not only keep the basin soil moist, but also spray water on the foliage surface, and always keep the foliage surface clean; for those foliage plant species that are not very cold-resistant, such as Fendai leaf, fruit taro, bamboo taro, leaf-changing wood, silver queen, etc., when the room temperature is close to the minimum temperature they can bear, special attention should be paid to controlling the amount of water to ensure that they can survive the winter safely.

The watering time in December should be 3 to 4 hours before and after noon, and the water temperature should be basically consistent with the air temperature and soil temperature, so as to avoid adverse reactions caused by low water temperature.

Newly transplanted flowers and trees outdoors should be checked frequently and replenished in time; for transplanted evergreen trees, foliar spray can be given around noon to prevent leaves from drying and falling off.

3. Fertilizer application

For most of the potted flowers and trees, foliage plants and bonsai placed in the general greenhouse, fertilizer should be stopped, otherwise it is easy to cause the plant to rot and die.

Most of the green trees and flowers planted on the ground Such as Begonia, Magnolia, Magnolia, Magnol Cryptomeria fortunei, cedar, cypress, Robinia pseudoacacia, elm leaf plum, Yu Li, white silk plum, heather, bauhinia, hibiscus, etc. While ploughing the garden field in December, fertilizers such as cake fertilizer, pig and cow manure, pond mud and septic tank residue can be applied to the periphery of the plant root system, so as to lay a good material foundation for next year's growth and flowering.

For potted flower species placed in the room from 10 ℃ to 15 ℃, such as camellia, tea plum, rhododendron, plum blossom, wax plum, golden bract, shrimp flower, pineapple, Ruixiang, melon leaf chrysanthemum, primrose, cyclamen, pedicel begonia, hyacinth, gentleman orchid, tulip, freesia, etc., 1.2% potassium dihydrogen phosphate can be applied to promote the pregnant bud and flowering of the plant.

4. Pruning

The hedgerows, green walls and ball shapes that have not been pruned in November are trimmed, such as privet, lobular privet, Fa Qing, big leaf boxwood, Shu juniper, four seasons cinnamon, spinulosa heather, etc.; balls such as gooseberry, bayberry, heather, yellow poplar, Haitong, Admiralty, pyracantha, dragon cypress, juniper, etc., can be fertilized while completing pruning.

The ground-planted flowers and trees that have not been pruned in November, such as rose, crape myrtle, palm, red leaf plum, heather, Fatong, plum blossom, wax plum and so on, can be pruned and fertilized around the root system after pruning.

For bonsai plant species dominated by shearing, such as hammer elm, sparrow plum, medlar bone, Fujian tea, maple, oak, white wax, fire thorn, June snow, Luohansong, cypress, cypress, begonia, papaya, etc., continue to prune in December to lay a good skeleton for next year's growth; plants that have not changed pots for many years can be combined with pruning to change pots.

5. Pest control

For flowers and trees that are prone to diseases and insect pests in the leaves of grape, begonia, rose, rose, camellia, crape myrtle, etc., the litter under their plants will be collected and burned, which can reduce the occurrence of diseases next year. At the same time, spray stone sulfur mixture for sterilization and disinfection.

For powdery mildew of potted melon-leaf chrysanthemum and Botrytis cinerea of primroses, the former was controlled by triadimefon or thiophanate-methyl in time, and the latter was controlled by thiophanate-methyl.

For the species of scale insects that are easy to appear in flowers and trees in the greenhouse, such as hadai, bergamot, cycad, camellia, orchid, etc., you can first wipe them with a dishcloth, and then use pesticides such as quick culling.

When there is poor ventilation, aphids often appear on potted plants, such as Magnolia, Milan, daidai, rose, Fujian tea, etc., can be controlled by tobacco water.

On the trunk and big branches of flowers and trees such as Haitong, sweet-scented osmanthus, Fatong, camellia, lobular privet, pyracantha, oleander, begonia, Magnolia, bauhinia, gardenia, cedar, heather, crape myrtle, wax plum, etc., there are many kinds of scale insects that often appear on the trunk and big branches of flowers and trees, such as horned wax scale, Japanese tortoise wax scale, red wax scale, shield scale, sagittal scale, pink scale, velvet scale, etc., at this time, spray and kill with high concentration of pesticides such as quinathulfan, quinathulene, buprofezin and other pesticides. Drug damage is rarely caused.

6. Compost fertilizer

In order to meet the needs of raising seedlings and preparing culture soil next year, rapeseed cake, bean cake and tea seed cake can be poured into water tank and pool for sealed soaking fermentation.

Dry withered grass, fallen leaves, shrubs, branches, etc., are piled up in layers with the garden soil, ignited and burned to form burning soil, which is a good covering soil for sowing and raising seedlings next year.

Compost, pond mud, chicken droppings and pigeon manure were mixed with garden soil and sealed fermentation, which can be used for topdressing seedlings and preparing culture soil in the coming year.

7. Preparation of culture soil

Make use of your winter free time to find an open space or pile up as much culture soil as possible in the shade of trees in case you need to change pots and plant flowers next spring. Generally, there are 4 parts of garden soil, 2 parts of rotten leaf soil (or 2 parts of alpine humus soil), 1 part of fine sand, 1 part of piled sawdust, tobacco dust or bran ash, plus about 5% retted cake fertilizer and 2% to 3% compound fertilizer. Among them, garden soil and rotten leaf soil should be screened, gravel, tree roots and other sundries should be sifted, fully mixed, covered with plastic film, and can also be stacked indoors after 3 to 4 months. It can be used for changing pots or potting grass flowers.

8. Turn over the ground and freeze the ground

For the garden used for sowing, cutting and planting seedlings next year, ploughing can be carried out in December; the garden for sowing and planting seedlings can be applied cake fertilizer, barnyard manure, pond mud and so on before replanting; temporarily do not make a bed, after freezing over the winter, to make a bed in the early spring of next year, it can greatly reduce the cost of seedling management, but also reduce the occurrence of diseases and insect pests.

Maintenance knowledge of bonsai

The ornamental plants suitable for bonsai modeling in December are: Luohan pine, Luohanbai, garden cypress, cypress, velvet cypress, Platycladus orientalis, Sabina vulgaris, black pine, five-needle pine, red pine, bayberry, wolfbone, holly, weeping spear, ginkgo, June snow, broom elm, finch, triangular maple, wax petal flower, Tamarix, pedicel begonia, weeping silk begonia, papaya begonia, melon seed yellow poplar, pearl yellow poplar, wisteria, purple myrtle, banyan, banyan, Fujian tea, white wax, oak and so on.

For bonsai plants fixed with brown wire (rope) or wire, if it has been fixed for one year, or obvious constriction marks are found on the stem or branch, the original ligature should be removed and the wire or brown rope should be used for hanging traction.

For plum piles, Luohansong, begonia, ginkgo, cypress, crape myrtle, etc., after some necessary pruning and plastic surgery, choose a good pot for planting and strengthen management, so that they can be used in public places or rooms for display in the coming year.

In winter, we must carefully manage some shallow landscape bonsai and tree stump bonsai: first, to prevent the roots of plants from frostbite in the basin soil; second, to prevent the disintegration of artificial cemented rocks caused by freezing; and third, to prevent plants planted on rockery from freezing or drying to death. It can be placed in an ice-free place and watered regularly so that it can survive the winter safely.