What if the leaves of Cunninghamia lanceolata are withered and yellow?

What to do if the leaves of Cunninghamia lanceolata are withered and yellow and fall off? because the potted time is too long, the soil is hardened, or because the indoor light is too poor for a long time, it often leads to only the top 2-3 whorls of branches and leaves, and the lower leaves are withered and yellow and fall off, forming the lower part completely barefoot or partially barefoot, losing its due ornamental value, and it can be rejuvenated by short cutting and cuttage propagation at the same time. In this way, not only the original plant can be dwarfed and renewed, but also a large seedling with 2-3 branches and 3 cuttings can be obtained, which can be said to kill many birds with one stone.

(1) high pressure truncation. From March to April, when the temperature rises to about 15 ℃, the barefoot plants are removed outdoors, and the ring peeling is carried out at the branches of 2-3 rounds below the trunk. The width of the peeled part is about 3 times the diameter of the trunk, and the phloem is completely stripped off. In order to accelerate the healing and rooting of the ring, 100mg / L No. 1 ABT rooting powder or naphthalene acetic acid solution can be applied to the peeling place. Wrap wet, loose, bacteria-free moss or humus around the wound, weighing about 1 to 2 kilograms. The clod is wrapped in a 30 cm x 30 cm thick plastic sheeting; then, tie it up with a rope together with the plastic sheet and clod, leaving an oblique opening on the top of the plastic sheet to replenish watering or pick up Rain Water when the dirt ball dries, often keeping the clod moist. In late summer and early autumn, intact roots can grow in the soil mass, which is cut off from the bottom of the soil ball, cut off the lowest branch, remove the plastic sheet, and then plant the soil mass in the flowerpot. If there are not many roots in the soil mass, you can extend it a little longer. You must wait until the root system is full and then cut it. Don't act too hastily.

(2) veteran cadres promote cuteness. The dry pile of Cunninghamia lanceolata after high-pressure truncation is removed from the basin in late autumn, part of the persistent soil is removed, the dead roots are cut off, and replaced with fertile and loose culture soil, replanted indoors, do not let the potted soil too damp in winter, so as to avoid rotting roots. When the temperature rises in the next spring, the best dry pile left is only about 30-40 cm. With the gradual increase of temperature, the hidden buds on the top of the dry pile will break dormancy and sprout, then add fertilizer and increase light. From June to July, when the sprouting is lignified or semi-lignified, except for leaving one of the strongest sprouting shoots as the main shoot, the other sprouting strips are broken from the base and reserved for cuttings.

(3) sprouting cuttings. Sprout the Nanyang fir, cut off the base 1-2 cm, soak the incision with 100mg / L No. 1 ABT rooting powder or naphthalene acetic acid solution for 5 seconds, dry it slightly, cover the basin mouth tightly with plastic film, tie it with rope and place it under the shade canopy. Open and check every 3-5 days after insertion, and it is found that the matrix should be replenished and watered in time. Until the end of autumn and the beginning of winter, the cuttings cut out good roots, then put them indoors for winter, and then planted them in pots the following year. As the polarity of Cunninghamia lanceolata cuttings is very obvious, the seedlings propagated by using the top of general lateral branches as cuttings will have a permanent lodging phenomenon, while the cuttings propagated by using truncated tips as cuttings can always maintain the vertical character.

Nanyang fir photo album

Basic information of Sequoia lanceolata

[Chinese name]: Cunninghamia lanceolata

[Latin name]: Araucaria cunninghamii Sweet

[species alias]: Cunninghamia lanceolata, Cryptomeria fortunei, Cunninghamia lanceolata

[section English name]: Taxodiaceae

[Coladin name]: Araucariaceae

[Chinese name]: Cunninghamia lanceolata

[Latin name]: Araucaria

Nanyang Cunninghamia lanceolata has a warm climate, fresh and humid air, soft and sufficient light, no cold resistance, no drought, sufficient sunshine in winter, strong light exposure in summer, and fear of dry winds in spring and hot sun in midsummer in the north. It grows best in the environment with a temperature of 25 ℃-30 ℃ and relative humidity above 70%. Pot culture requires loose and fertile soil with high humus content and strong drainage and air permeability.

Morphological characteristics of Cryptomeria fortunei

Trees, up to 60-70 m in origin, DBH more than 1 m, bark grayish brown or dark gray, thick, transversely lobed; large branches spreading or obliquely extended, young crown spire-shaped, old flat-topped, lateral branchlets dense, drooping, subpinnately arranged. Type 2: the leaves of young trees and lateral branches are loosely arranged, spreading, cone-shaped, needle-shaped, falcate or triangular, 7-17 mm long, base about 2.5 mm wide, slightly curved, slightly quadrangular or upper (ventral) ridge inconspicuous, with most stomatal lines above, lower stomatal lines irregular or nearly non-stomatal lines, upper tapering, apex with acuminate or acuminate tip The leaves on the big branches and flower and fruit branches are closely arranged and overlapped, extending obliquely upward, slightly curved upward, ovate, triangular-ovate or triangular, without a conspicuous back or longitudinal ridge below, 6-10 mm long. Cones ovoid or elliptic, 6-10 cm long and 4 cm wide, base wide, upper part narrowing or slightly rounded, apex pointed or obtuse, midvein obvious or obscure, gray-green above, powdery, with many stomatal lines, green below, only irregular sparse stomatal lines in the middle and lower parts. Male cones solitary, Terete. Cones ovate or elliptic, 6-10 cm long and 4.5-7.5 cm in diameter; bract scales cuneate-Obovate, thinly winged on both sides, apex broad and thick, with acute ridges, with acute long caudate tip, tip conspicuously retrorse; apex of Shezhuang heavy forest thin, not thick; seeds elliptic, with United membranous wings on both sides.

Southern fir culture:

Seedling transplant

Cunninghamia lanceolata is warm and humid, shade-tolerant, not cold-tolerant, long taproot and few fibrous roots of seed-sown seedlings. When seedlings are transplanted, they are easy to die. In order to improve the survival rate of southern fir seedling transplantation, we should pay attention to the following technical points.

First, protect the root

Because the lateral roots of young seedlings of Cunninghamia lanceolata are rare and the hairy roots are fine, they will wither and wither if they are not paid attention to, so it is very important to protect the roots of seedlings. First of all, the soil should be transported with the basin, and the original culture soil should be kept wet. Secondly, the seedlings should be planted immediately after they are bought back. If it is too late for planting, they should be placed in a cool and moist place and should not be exposed to the sun, so as to protect the seedlings, especially the root system. In addition, when the temperature is low in winter, the root system is easy to be frozen during transportation, so attention should be paid to heat preservation.

Second, fine planting

When planting, the seedlings should take the original soil as far as possible, the planting soil should be loose and fine, do not press the root soil too hard, and pour enough fixed root water after planting. In addition, the taproot of seed-sown seedlings is long, and the planting should be deeper, so as not to expose and lodge the roots and affect the survival.

Third, heat preservation

Cunninghamia lanceolata is not cold-resistant, if it is planted in winter or early spring, in addition to anti-freezing in the process of transportation, heat preservation measures should also be taken after planting, such as planting in a greenhouse or covered with plastic film arch.

Fourth, shading

Cunninghamia lanceolata is a shade-tolerant flower, and its seedlings are more afraid of sun exposure, so it should be shaded immediately after planting.

5. Treatment of broken and residual seedlings

The seedling tissue of Cunninghamia lanceolata is young and easy to be broken, which can be remedied by the following measures. The seedlings with broken roots can be washed with clean water and inserted in plain sand. At suitable temperature, the roots can be re-rooted from the cross section after 1 Mel for 2 weeks, and then planted after the root system is developed. The seedlings with broken buds, broken stems and leaves can be fixed as usual, and new buds will sprout after a certain period of time after survival.

Main points of cultivation

The leaves of southern fir are yellow for the following reasons:

1. If the light is too weak, the maintenance and management of Cunninghamia lanceolata grows well in the place of good light, and it will show the phenomenon of leaf yellowing and leaf shedding in the place of weak light for a long time, which needs to be gradually moved to the advantage of light, otherwise the plant will further aggravate the disease.

two。 If there is too much watering, the watering principle of Cunninghamia lanceolata is dry and wet, and the potted soil should not be watered too much or too frequently, otherwise the roots will rot when they do not get oxygen, making it difficult to absorb water and nutrients, and the plants will show symptoms of discomfort.

3. When the temperature is below 5 ℃, the leaves of Cunninghamia lanceolata will turn yellow and a small amount will fall off. In the high temperature period, if the air humidity is now lower, there will be a large number of yellow leaves.

4. Acute dehydration of leaves caused by too low air humidity or too strong wind, which requires putting it in the soft wind, or spraying water frequently to improve air humidity.

5. The infection of disease should be prevented by spraying carbendazim and chlorothalonil.

The leaves of Cunninghamia lanceolata are lost and yellow for the following reasons:

1. If the light is too weak, the maintenance and management of Cunninghamia lanceolata grows well in the place of good light, and it will show the phenomenon of leaf yellowing and leaf shedding in the place of weak light for a long time, which needs to be gradually moved to the advantage of light, otherwise the plant will further aggravate the disease.

two。 If there is too much watering, the watering principle of Cunninghamia lanceolata is dry and wet, and the basin soil should not be watered too much or too frequently, otherwise the roots will rot when they do not get oxygen, making it difficult to absorb water and nutrients, and the plants will show symptoms of discomfort.

3. When the temperature is below 5 ℃, the leaves of Cunninghamia lanceolata will turn yellow and a small amount will fall off. In the high temperature period, if the air humidity is now lower, there will be a large number of yellow leaves.

4. Acute dehydration of leaves caused by too low air humidity or too strong wind, which requires putting it in the soft wind, or spraying water frequently to improve air humidity.

5. The infection of disease should be prevented by spraying carbendazim and chlorothalonil.

How to raise Nanyang fir

Cunninghamia lanceolata likes humid or semi-dry climate, which requires that the relative air temperature of the growing environment is 50-70%. When the air relative humidity is too low, the lower leaves yellowing and falling off, and the upper leaves are not glossy.

The temperature requirement is not strict, but the area north of the Yangtze River overwinters without exposure.

Light management: strong ability to adapt to light. Put in indoor maintenance, as far as possible in places with bright light, such as well-lit living room, bedroom, study and other places. After indoor maintenance for a period of time (about a month), it should be moved to an outdoor place with shade (heat preservation in winter) for a period of time (about a month), so alternately.

Fertilizer and water management: for potted plants, in addition to adding organic fertilizer when potting, proper fertilizer and water management should be carried out in the usual maintenance process.

The three seasons of spring, summer and autumn are the peak growing season of Cunninghamia lanceolata. Fertilizer and water management circulates according to the order of "Huabao"-- clear water-- "Huabao"-- clear water. The interval period is about 1-4 days, and the interval period is shorter in sunny or high temperature days. The interval period is longer or not watered during rainy days or low temperatures. During the dormant period in winter, the main task is to control fertilizer and water. Fertilizer and water management circulates according to the order of "Huabao"-clear water-clear water-"Huabao"-clear water-clear water, the interval period is about 3-7 days, the interval period is shorter during sunny or high temperature, and the interval is longer or not watered during cloudy and rainy days or low temperature.

For ground-planted plants, fertilizer and water were applied 2 to 4 times in spring and summer according to drought conditions: first, a small trench was opened at 30cm to 100cm outside the root neck (the larger the plant, the farther away from the root neck), the width and depth of the ditch were both 20cm. The ditch is sprinkled with 25-50 jin of organic fertilizer, or 1-5 two-grain compound fertilizer (chemical fertilizer), and then poured with water. After the beginning of winter, before the beginning of spring, fertilize again according to the above method, but do not need watering.

Pruning: when the plant enters the dormant or semi-dormant period in winter, the branches such as thin, disease and insect, withered and overdense should be cut off. The branches can also be arranged in combination with cuttings.

Change the basin: as long as it is properly maintained, it will grow very fast. when it grows to a certain size, it should be considered to change a larger basin to allow it to continue to grow vigorously. The culture soil and composition ratio for basin change can be selected as follows: vegetable garden soil: slag = 3RU 1; orchard soil: medium coarse river sand: sawdust = 4RU 1RU 2; or one of paddy soil, pond mud, rotten leaf soil.

Take off the basin: put the flowers that want to change the basin on the ground, first pat the four sides of the basin with a slap, so that the root system is shaken and separated from the basin wall, put the flowerpot upside down on the left hand, gently clamp the plant with the index finger and middle finger of the left hand, hold the edge of the basin with the wrist and fingertip, hit the bottom of the basin with the right hand, and then use the mother finger to top the root soil down from the bottom hole to let the plant come out. After taking it off, gently pat the basin soil with both palms to let the excess soil fall off.

Pot planting Management of Cunninghamia lanceolata

Loosening soil and watering

Watering and loosening topsoil in time after planting to reduce water evaporation. Usually watering should be moderate, frequently watering during the growing season, watering 2-3 times a week, infiltration depth of 10-15 cm is appropriate. With the growth of seedlings, the number of watering decreases, often keep the basin soil and the surrounding environment moist, strictly prevent drought and waterlogging. In the season of high temperature and drought, you should often spray water or spray to the leaf surface and the surrounding environment to increase air humidity and keep the soil moist. Avoid summer basin soil is too dry or winter water is too large, too dry or too wet are easy to cause lower leaves to droop soft. Avoid strong light exposure in summer, can be placed in the shade of the shed, often sprinkle water, in order to maintain high air humidity.

Plastic management of Cryptomeria lanceolata

Southern fir to stand upright for the United States, in the second year of cutting seedlings, or when sowing seedlings grow to about 50 cm, should be wrapped with a stick to support, in order to prevent plant distortion and affect the ornamental effect. The young trees should change their pots once every year or every other spring, and the plants for more than five years should turn the pots and change the soil every two or three years, combined with spraying dwarf to control the height of southern fir. At the end of April or early May, the northern area comes out to take shelter from the wind and the sun for maintenance. Proper shading is needed in midsummer, and the basin is turned at the right time in the growing season, so as to prevent the tree-shaped growth from deviating and affecting the ornamental. Cunninghamia lanceolata is not resistant to severe cold. In the northern region, Cold Dew moved indoors at the end of September or early October, where there is plenty of sunshine and air circulation, forbid fertilizer and control water, and the room temperature should not be lower than 8 ℃.

Apply fertilizer frequently

Potted Cunninghamia lanceolata should be mixed with rotten leaf soil, peat soil, pure river sand and a small amount of mature organic fertilizer. In the basin soil, it is better to mix 3 parts of loam, 1 part of rotten leaf soil, 1 part of coarse sand and a small amount of plant ash, and the depth of the soil layer lies in the bud point of the upper layer just exposed on the soil surface. Since the sprouting of new buds in spring, applying dilute organic liquid fertilizer and calcium fertilizer once or twice a month can keep the plant fresh and oily.

Cryptomeria fortunei

Basic information of Sequoia lanceolata

[Chinese name]: Cunninghamia lanceolata

[Latin name]: Araucaria cunninghamii Sweet

[species alias]: Cunninghamia lanceolata, Cryptomeria fortunei, Cunninghamia lanceolata

[section English name]: Taxodiaceae

[Coladin name]: Araucariaceae

[Chinese name]: Cunninghamia lanceolata

[Latin name]: Araucaria

Nanyang Cunninghamia lanceolata has a warm climate, fresh and humid air, soft and sufficient light, no cold resistance, no drought, sufficient sunshine in winter, strong light exposure in summer, and fear of dry winds in spring and hot sun in midsummer in the north. It grows best in the environment with a temperature of 25 ℃-30 ℃ and relative humidity above 70%. Pot culture requires loose and fertile soil with high humus content and strong drainage and air permeability.

Morphological characteristics of Cryptomeria fortunei

Trees, up to 60-70 m in origin, DBH more than 1 m, bark grayish brown or dark gray, thick, transversely lobed; large branches spreading or obliquely extended, young crown spire-shaped, old flat-topped, lateral branchlets dense, drooping, subpinnately arranged. Type 2: the leaves of young trees and lateral branches are loosely arranged, spreading, cone-shaped, needle-shaped, falcate or triangular, 7-17 mm long, base about 2.5 mm wide, slightly curved, slightly quadrangular or upper (ventral) ridge inconspicuous, with most stomatal lines above, lower stomatal lines irregular or nearly non-stomatal lines, upper tapering, apex with acuminate or acuminate tip The leaves on the big branches and flower and fruit branches are closely arranged and overlapped, extending obliquely upward, slightly curved upward, ovate, triangular-ovate or triangular, without a conspicuous back or longitudinal ridge below, 6-10 mm long. Cones ovoid or elliptic, 6-10 cm long and 4 cm wide, base wide, upper part narrowing or slightly rounded, apex pointed or obtuse, midvein obvious or obscure, gray-green above, powdery, with many stomatal lines, green below, only irregular sparse stomatal lines in the middle and lower parts. Male cones solitary, Terete. Cones ovate or elliptic, 6-10 cm long and 4.5-7.5 cm in diameter; bract scales cuneate-Obovate, thinly winged on both sides, apex broad and thick, with acute ridges, with acute long caudate tip, tip conspicuously retrorse; apex of Shezhuang heavy forest thin, not thick; seeds elliptic, with United membranous wings on both sides.

Southern fir culture:

Seedling transplant

Cunninghamia lanceolata is warm and humid, shade-tolerant, not cold-tolerant, long taproot and few fibrous roots of seed-sown seedlings. When seedlings are transplanted, they are easy to die. In order to improve the survival rate of southern fir seedling transplantation, we should pay attention to the following technical points.

First, protect the root

Because the lateral roots of young seedlings of Cunninghamia lanceolata are rare and the hairy roots are fine, they will wither and wither if they are not paid attention to, so it is very important to protect the roots of seedlings. First of all, the soil should be transported with the basin, and the original culture soil should be kept wet. Secondly, the seedlings should be planted immediately after they are bought back. If it is too late for planting, they should be placed in a cool and moist place and should not be exposed to the sun, so as to protect the seedlings, especially the root system. In addition, when the temperature is low in winter, the root system is easy to be frozen during transportation, so attention should be paid to heat preservation.

Second, fine planting

When planting, the seedlings should take the original soil as far as possible, the planting soil should be loose and fine, do not press the root soil too hard, and pour enough fixed root water after planting. In addition, the taproot of seed-sown seedlings is long, and the planting should be deeper, so as not to expose and lodge the roots and affect the survival.

Third, heat preservation

Cunninghamia lanceolata is not cold-resistant, if it is planted in winter or early spring, in addition to anti-freezing in the process of transportation, heat preservation measures should also be taken after planting, such as planting in a greenhouse or covered with plastic film arch.

Fourth, shading

Cunninghamia lanceolata is a shade-tolerant flower, and its seedlings are more afraid of sun exposure, so it should be shaded immediately after planting.

5. Treatment of broken and residual seedlings

The seedling tissue of Cunninghamia lanceolata is young and easy to be broken, which can be remedied by the following measures. The seedlings with broken roots can be washed with clean water and inserted in plain sand. At suitable temperature, the roots can be re-rooted from the cross section after 1 Mel for 2 weeks, and then planted after the root system is developed. The seedlings with broken buds, broken stems and leaves can be fixed as usual, and new buds will sprout after a certain period of time after survival.

Main points of cultivation

The leaves of southern fir are yellow for the following reasons:

1. If the light is too weak, the maintenance and management of Cunninghamia lanceolata grows well in the place of good light, and it will show the phenomenon of leaf yellowing and leaf shedding in the place of weak light for a long time, which needs to be gradually moved to the advantage of light, otherwise the plant will further aggravate the disease.

two。 If there is too much watering, the watering principle of Cunninghamia lanceolata is dry and wet, and the potted soil should not be watered too much or too frequently, otherwise the roots will rot when they do not get oxygen, making it difficult to absorb water and nutrients, and the plants will show symptoms of discomfort.

3. When the temperature is below 5 ℃, the leaves of Cunninghamia lanceolata will turn yellow and a small amount will fall off. In the high temperature period, if the air humidity is now lower, there will be a large number of yellow leaves.

4. Acute dehydration of leaves caused by too low air humidity or too strong wind, which requires putting it in the soft wind, or spraying water frequently to improve air humidity.

5. The infection of disease should be prevented by spraying carbendazim and chlorothalonil.

The leaves of Cunninghamia lanceolata are lost and yellow for the following reasons:

1. If the light is too weak, the maintenance and management of Cunninghamia lanceolata grows well in the place of good light, and it will show the phenomenon of leaf yellowing and leaf shedding in the place of weak light for a long time, which needs to be gradually moved to the advantage of light, otherwise the plant will further aggravate the disease.

two。 If there is too much watering, the watering principle of Cunninghamia lanceolata is dry and wet, and the basin soil should not be watered too much or too frequently, otherwise the roots will rot when they do not get oxygen, making it difficult to absorb water and nutrients, and the plants will show symptoms of discomfort.

3. When the temperature is below 5 ℃, the leaves of Cunninghamia lanceolata will turn yellow and a small amount will fall off. In the high temperature period, if the air humidity is now lower, there will be a large number of yellow leaves.

4. Acute dehydration of leaves caused by too low air humidity or too strong wind, which requires putting it in the soft wind, or spraying water frequently to improve air humidity.

5. The infection of disease should be prevented by spraying carbendazim and chlorothalonil.

How to raise Nanyang fir

Cunninghamia lanceolata likes humid or semi-dry climate, which requires that the relative air temperature of the growing environment is 50-70%. When the air relative humidity is too low, the lower leaves yellowing and falling off, and the upper leaves are not glossy.

The temperature requirement is not strict, but the area north of the Yangtze River overwinters without exposure.

Light management: strong ability to adapt to light. Put in indoor maintenance, as far as possible in places with bright light, such as well-lit living room, bedroom, study and other places. After indoor maintenance for a period of time (about a month), it should be moved to an outdoor place with shade (heat preservation in winter) for a period of time (about a month), so alternately.

Fertilizer and water management: for potted plants, in addition to adding organic fertilizer when potting, proper fertilizer and water management should be carried out in the usual maintenance process.

The three seasons of spring, summer and autumn are the peak growing season of Cunninghamia lanceolata. Fertilizer and water management circulates according to the order of "Huabao"-- clear water-- "Huabao"-- clear water. The interval period is about 1-4 days, and the interval period is shorter in sunny or high temperature days. The interval period is longer or not watered during rainy days or low temperatures. During the dormant period in winter, the main task is to control fertilizer and water. Fertilizer and water management circulates according to the order of "Huabao"-clear water-clear water-"Huabao"-clear water-clear water, the interval period is about 3-7 days, the interval period is shorter during sunny or high temperature, and the interval is longer or not watered during cloudy and rainy days or low temperature.

For ground-planted plants, fertilizer and water were applied 2 to 4 times in spring and summer according to drought conditions: first, a small trench was opened at 30cm to 100cm outside the root neck (the larger the plant, the farther away from the root neck), the width and depth of the ditch were both 20cm. The ditch is sprinkled with 25-50 jin of organic fertilizer, or 1-5 two-grain compound fertilizer (chemical fertilizer), and then poured with water. After the beginning of winter, before the beginning of spring, fertilize again according to the above method, but do not need watering.

Pruning: when the plant enters the dormant or semi-dormant period in winter, the branches such as thin, disease and insect, withered and overdense should be cut off. The branches can also be arranged in combination with cuttings.

Change the basin: as long as it is properly maintained, it will grow very fast. when it grows to a certain size, it should be considered to change a larger basin to allow it to continue to grow vigorously. The culture soil and composition ratio for basin change can be selected as follows: vegetable garden soil: slag = 3RU 1; orchard soil: medium coarse river sand: sawdust = 4RU 1RU 2; or one of paddy soil, pond mud, rotten leaf soil.

Take off the basin: put the flowers that want to change the basin on the ground, first pat the four sides of the basin with a slap, so that the root system is shaken and separated from the basin wall, put the flowerpot upside down on the left hand, gently clamp the plant with the index finger and middle finger of the left hand, hold the edge of the basin with the wrist and fingertip, hit the bottom of the basin with the right hand, and then use the mother finger to top the root soil down from the bottom hole to let the plant come out. After taking it off, gently pat the basin soil with both palms to let the excess soil fall off.

Pot planting Management of Cunninghamia lanceolata

Loosening soil and watering

Watering and loosening topsoil in time after planting to reduce water evaporation. Usually watering should be moderate, frequently watering during the growing season, watering 2-3 times a week, infiltration depth of 10-15 cm is appropriate. With the growth of seedlings, the number of watering decreases, often keep the basin soil and the surrounding environment moist, strictly prevent drought and waterlogging. In the season of high temperature and drought, you should often spray water or spray to the leaf surface and the surrounding environment to increase air humidity and keep the soil moist. Avoid summer basin soil is too dry or winter water is too large, too dry or too wet are easy to cause lower leaves to droop soft. Avoid strong light exposure in summer, can be placed in the shade of the shed, often sprinkle water, in order to maintain high air humidity.

Plastic management of Cryptomeria lanceolata

Southern fir to stand upright for the United States, in the second year of cutting seedlings, or when sowing seedlings grow to about 50 cm, should be wrapped with a stick to support, in order to prevent plant distortion and affect the ornamental effect. The young trees should change their pots once every year or every other spring, and the plants for more than five years should turn the pots and change the soil every two or three years, combined with spraying dwarf to control the height of southern fir. At the end of April or early May, the northern area comes out to take shelter from the wind and the sun for maintenance. Proper shading is needed in midsummer, and the basin is turned at the right time in the growing season, so as to prevent the tree-shaped growth from deviating and affecting the ornamental. Cunninghamia lanceolata is not resistant to severe cold. In the northern region, Cold Dew moved indoors at the end of September or early October, where there is plenty of sunshine and air circulation, forbid fertilizer and control water, and the room temperature should not be lower than 8 ℃.

Apply fertilizer frequently

Potted Cunninghamia lanceolata should be mixed with rotten leaf soil, peat soil, pure river sand and a small amount of mature organic fertilizer. In the basin soil, it is better to mix 3 parts of loam, 1 part of rotten leaf soil, 1 part of coarse sand and a small amount of plant ash, and the depth of the soil layer lies in the bud point of the upper layer just exposed on the soil surface. Since the sprouting of new buds in spring, applying dilute organic liquid fertilizer and calcium fertilizer once or twice a month can keep the plant fresh and oily.