How to grow Araucaria cunninghamii? Detailed growing methods and precautions
Introduction to Araucaria cunninghamii
Araucaria cunninghamii is a tree, reaching up to 60-70 m tall in its native habitat, with a diameter at breast height of more than 1 m; the bark is grayish brown or dark gray, coarse, with transverse fissures; the large branches are spreading or slanting, the crown of young trees is spire-shaped, and when old it becomes flat-topped, with the side branchlets densely borne, drooping, and arranged nearly pinnately. Araucaria cunninghamii is not cold-tolerant and dislikes drought, and needs plenty of sunlight in winter; it is native to the southeastern coastal areas of Oceania, and is now grown outdoors in courtyards in Guangdong, Fujian, Taiwan, China, Hainan, Yunnan, Guangxi and other places in China.
Growth habits of Araucaria cunninghamii
Araucaria cunninghamii likes light, while seedlings prefer shade. It likes a warm and humid climate and is not tolerant of drought or cold. It likes fertile soil. It grows relatively fast, has strong sprouting ability, and is strongly wind-resistant.
In winter it needs plenty of sunlight, and in summer strong direct sunlight should be avoided; it fears the dry gales of northern spring and the scorching sun of midsummer, and grows best under environmental conditions of 25°C-30°C and relative humidity above 70%. For pot cultivation, it requires a loose, fertile growing medium with relatively high humus content and strong drainage and aeration
Geographical distribution of Araucaria cunninghamii
It is native to South America, Australia and the Pacific Islands, and the southeastern coastal areas such as Queensland in Oceania, and is cultivated in Guangdong, Fujian, Hainan, Yunnan and Guangxi in China. In the Yangtze River basin and the major cities to its north, it is grown in pots and overwintered in greenhouses.
Pot cultivation management
Loosening the soil and watering Araucaria cunninghamii
After planting, water promptly and loosen the surface soil to reduce water evaporation. Usually watering should be moderate; water frequently during the growing season, 2-3 times a week, with the water soaking 10-15 cm deep as appropriate. As the seedling grows, reduce the frequency of watering, always keeping the potting soil and the surrounding environment moist, and strictly guard against drought and waterlogging. In hot and dry periods, water or mist the leaves and the surrounding environment frequently to increase air humidity and keep the soil moist. Avoid the potting soil being too dry in summer or the water amount being too large in winter; either too dry or too wet can easily cause the lower leaves to droop and soften. In summer avoid strong direct sunlight; it can be placed in a shaded spot in a shed, with frequent sprinkling to maintain relatively high air humidity.
Shaping and management of Araucaria cunninghamii
Araucaria cunninghamii is valued for its upright, straight plant form. In the second year of a cutting-grown seedling, or when a seed-grown seedling has grown to about 50 cm, a stick should be set up and wrapped around it for support to prevent the plant from twisting and affecting its ornamental effect. Young trees should be repotted once a year or every other year in spring, and plants over five years old should have their pots and soil changed once every two or three years, combined with spraying chlormequat to control the height of Araucaria cunninghamii. In northern regions, move it outdoors at the end of April or the beginning of May and keep it in a wind-sheltered, sunny spot; in midsummer it needs appropriate shading, and during the growing season turn the pot in good time to prevent the tree form from growing lopsided and affecting its ornamental value. Araucaria cunninghamii is not tolerant of severe cold; in northern regions, move it indoors at the end of September or the beginning of October (Cold Dew), place it in a spot with plenty of sunlight and good air circulation, stop fertilizing and control watering, and the room temperature must not be lower than 8°C.
Frequent fertilizer application for Araucaria cunninghamii
For potted Araucaria cunninghamii, it is best to use a mix of leaf mold, peat soil, clean river sand and a small amount of decomposed organic fertilizer. The potting soil is best mixed from 3 parts loam, 1 part leaf mold, 1 part coarse sand and a small amount of plant ash, and the depth of the soil layer should be controlled so that the bud points that root in the upper layer are just exposed on the soil surface. Starting from the sprouting of new buds in spring, apply 1-2 times a month of decomposed dilute organic liquid fertilizer and calcium fertilizer, which can keep the plant form fresh and the leaf color glossy.
Transplanting Araucaria cunninghamii seedlings
Araucaria cunninghamii likes warmth and humidity, is shade-tolerant and not cold-tolerant, and seed-sown seedlings have a long taproot and few fibrous roots. When transplanting seedlings, they easily die. To improve the survival rate of transplanted Araucaria cunninghamii seedlings, the following technical points should be handled well.
1. Protecting the roots
Because Araucaria cunninghamii seedlings have few lateral roots and fine hair roots, which can shrivel and dry out with the slightest neglect, protecting the seedling root system is very important. First, they should be transported together with the pot and soil, and the original growing medium should be kept moist. Second, after the seedlings are bought back, they should be planted immediately; if planting cannot be done right away for the moment, they should be placed in a cool, moist spot and must not be exposed to the sun, so as to keep the seedlings, especially the root system, fresh and alive. In addition, when the winter temperature is relatively low, the roots are prone to freezing during transport, so attention should be paid to keeping them warm.
2. Careful planting
When planting, keep as much of the original soil on the seedlings as possible; the planting soil should be loose and fine, and the soil at the root should not be pressed too hard; after planting, water thoroughly to settle the roots. In addition, seed-sown Araucaria cunninghamii seedlings have a long taproot, so planting should be somewhat deep to avoid root exposure and lodging, which would affect survival.
3. Keeping warm
Araucaria cunninghamii is not cold-tolerant. If seedlings are bought and planted in winter or early spring, besides paying attention to freeze protection during transport, warmth-keeping measures should also be taken after planting, such as planting in a greenhouse or covering with an arched plastic film.
4. Shading
Araucaria cunninghamii is a shade-tolerant ornamental plant, and seedlings are even more afraid of direct sunlight, so they must be shaded immediately after planting.
5. Handling of broken seedlings
Araucaria cunninghamii seedlings have tender tissues and break easily; the following methods can be used for remedy. For seedlings with broken roots, wash them with clean water and insert them into plain sand; at a suitable temperature, they can re-root from the cut surface after 1-2 weeks, and can be planted after the root system has developed. For seedlings with broken buds or stems but with leaves, they can be planted as usual, and after surviving they will sprout new buds after a certain period.
Precautions for propagation
Seed-sown seedlings are highly susceptible to damage from diseases and pests, so the soil must be sterilized.
If you want more cuttings, you can cut off the top of a young tree to make the top send out more new shoots, cut them off in spring to use as cuttings, and the cut plant can still continue to grow a terminal bud and be used as a long-term mother plant for propagation.
If the potting soil is too dry during the growing period, the leaves of Araucaria cunninghamii will become soft and droop, so watering should be moderate.
The winter temperature should not be too low; too low a temperature will cause cold damage to Araucaria cunninghamii, and it is very likely to die.
Growing methods and precautions for Araucaria heterophylla
Brief introduction to the Araucaria cunninghamii plant
Araucaria cunninghamii is a tree, reaching up to 60-70 m tall in its native habitat, with a diameter at breast height of more than 1 m; the bark is grayish brown or dark gray, coarse, with transverse fissures; the large branches are spreading or slanting, the crown of young trees is spire-shaped, and when old it becomes flat-topped, with the side branchlets densely borne, drooping, and arranged nearly pinnately. Araucaria cunninghamii is not cold-tolerant and dislikes drought, and needs plenty of sunlight in winter; it is native to the southeastern coastal areas of Oceania, and is now grown outdoors in courtyards in Guangdong, Fujian, Taiwan, China, Hainan, Yunnan, Guangxi and other places in China.
Growing environment of Araucaria cunninghamii
It likes a warm, humid environment and grows well in sunny places; it has a certain shade tolerance, but strong direct sunlight in summer should be avoided. It is not tolerant of cold or drought, and is suited to well-drained, humus-rich, slightly acidic sandy loam.
1. Summer and autumn are the growing season of Araucaria heterophylla. Potted plants can be placed in a semi-shaded spot outdoors, or kept in a ventilated spot with light at a window; avoid scorching sunlight above 35°C, and do not leave them for long in a lightless, shaded place, as either will cause the branches and leaves to turn yellow and wither or to grow leggy, reducing their ornamental value.
2. During the growth of Araucaria heterophylla, to prevent the trunk from leaning to one side, it is advisable to turn the pot once every half month so the plant receives light evenly. In addition, the trunk of young trees is fragile and easily bends and deforms, so from the young plant stage a support should be set up to fix the trunk. To prevent the plant from growing too tall, it should be repotted once every 2-3 years after the weather warms in spring. Usually take care to protect the side branches so they are not damaged and affect the plant shape.
3. Under normal conditions, Araucaria heterophylla does not need branch pruning; let it grow naturally. The optimum growing temperature is 10-25°C, and the overwintering temperature is above 5°C. During the overwintering season, some light can be given, the potting soil should not be too dry, and on clear days water should also be sprayed to increase humidity.
Propagation methods of Araucaria cunninghamii
Seed propagation
Because seed propagation is hampered by a hard seed coat and a low germination rate, it is best to break the seed coat before sowing to promote germination. In addition, seed-sown seedlings are susceptible to damage from diseases and pests, so the soil used should be strictly sterilized. The seeds are best pre-germinated in a sand bed or sown by the above shell-breaking method to increase the seed germination rate; generally they can germinate in about 30 days.
Cutting propagation
Cutting propagation is relatively easy and is widely used. Cuttings are generally taken in spring and summer, but the main branch must be selected as the cutting; plants grown from side-branch cuttings are crooked and not upright. The cuttings are 10 to 15 cm long; after insertion, under conditions of 18°C to 25°C and relatively high air humidity, they can root in about 4 months. If the base of the cutting is soaked in 200 ppm indolebutyric acid (IBA) for 5 hours before insertion, rooting can be promoted earlier.
Growing methods for Araucaria cunninghamii
1. Soil:
For growing Araucaria cunninghamii, the most suitable potting soil is a mix of 1/3 leaf mold, 1/3 garden soil and 1/3 river sand plus a small amount of base fertilizer.
2. Watering:
Araucaria cunninghamii likes a humid environment. For this reason, in dry seasons and summer, attention should be paid to frequently spraying clean water on the leaves, which can both increase air humidity and keep the leaf color fresh and bright, and is very beneficial to its photosynthesis. During care, watering should be moderate; in summer watering should be sufficient to promptly replenish what is lost through leaf transpiration and avoid drought damage. But watering must not be excessive, causing water to accumulate in the potting soil. Usually it is appropriate to keep the potting soil constantly moist.
3. Light:
Araucaria cunninghamii likes plenty of sunlight. In northern regions, it is generally moved in early May to a south-facing balcony or a sunny spot in the courtyard, and after summer begins, appropriate shading should be provided to avoid direct sunlight. When grown in northern regions, it should be moved indoors at the end of September or the beginning of October, placed in a sunny spot, and watering controlled
4. Temperature:
Araucaria cunninghamii can grow under a variety of different temperatures, but its cold tolerance is not strong; the optimum growing temperature is 7-24°C. If the temperature rises, the air humidity around the plant should be increased.
5. Fertilizing:
Araucaria cunninghamii grows relatively fast, so in its vigorous growing season it needs frequent topdressing to supplement the nutrients required for its growth. Generally starting from the sprouting of new buds in spring, take care to apply 1-2 times a month of decomposed dilute cake fertilizer water for it to absorb and use, so that it can grow robustly.
6. Pruning:
Araucaria cunninghamii is prone to the gradual yellowing and shedding of the lower branches and leaves, causing the whole plant to be top-heavy and affecting its appearance; in care it should be carefully managed and necessary pruning carried out.
7. Pests:
The diseases of Araucaria cunninghamii include leaf spot, branch blight and root nodule disease, etc. For leaf spot and branch blight, spraying with 70% thiophanate-methyl 8(” times solution or 65% zineb wettable powder 500-600 times solution can be chosen for control; for canker, smear with 40% asomate 100 times solution or potassium permanganate 1001〕 times solution for disinfection; for root nodule disease, soak with streptomycin 1000 times solution. The main pest is damage by scale insects; when only a few occur, rinse the leaves with clean water, and when more serious, spray with 40% omethoate emulsion 500-100() times solution to kill them.
Growing conditions for Araucaria cunninghamii
Soil and fertilizer requirements
For potted Araucaria cunninghamii, it is best to use a mix of leaf mold, peat soil, clean river sand and a small amount of decomposed organic fertilizer. The potting soil is best mixed from 3 parts loam, 1 part leaf mold, 1 part coarse sand and a small amount of plant ash, and the depth of the soil layer should be controlled so that the bud points that root in the upper layer are just exposed on the soil surface. Starting from the sprouting of new buds of Araucaria cunninghamii in spring, apply 1-2 times a month of decomposed dilute organic liquid fertilizer and calcium fertilizer, which can keep the plant form fresh and the leaf color glossy.
Repotting and pruning/shaping
Araucaria cunninghamii is valued for its upright, straight plant form. In the second year of a cutting-grown seedling, or when a seed-grown seedling has grown to about 50 cm, a stick should be set up and wrapped around it for support to prevent the plant from twisting and affecting its ornamental effect. Young trees should be repotted once a year or every other year in spring, and plants over five years old should have their pots and soil changed once every two or three years, combined with spraying chlormequat to control the height of Araucaria cunninghamii. In northern regions, move it outdoors at the end of April or the beginning of May and keep it in a wind-sheltered, sunny spot; in midsummer it needs appropriate shading, and during the growing season turn the pot in good time to prevent the tree form from growing lopsided and affecting its ornamental value. Araucaria cunninghamii is not tolerant of severe cold; in northern regions, move it indoors at the end of September or the beginning of October (Cold Dew), place it in a spot with plenty of sunlight and good air circulation, stop fertilizing and control watering, and the room temperature must not be lower than 8°C.
Watering and maintaining humidity
Usually watering Araucaria cunninghamii should be moderate; water frequently during the growing season, 2-3 times a week, with the water soaking 10-15 cm deep as appropriate. As Araucaria cunninghamii grows, reduce the frequency of watering, always keeping the potting soil and the surrounding environment moist, and strictly guard against drought and waterlogging. In hot and dry periods, water or mist the leaves of Araucaria cunninghamii and the surrounding environment frequently to increase air humidity and keep the soil moist. Avoid the potting soil being too dry in summer or the water amount being too large in winter; either too dry or too wet can easily cause the lower leaves to droop and soften. In summer avoid strong direct sunlight; it can be placed in a shaded spot in a shed, with frequent sprinkling to maintain relatively high air humidity.
Precautions for growing Araucaria cunninghamii
1. Young Araucaria cunninghamii trees are best repotted once a year or every other year in spring, and plants over five years old are best repotted and have their soil changed once every two or three years.
2. Maintain environmental humidity. Araucaria cunninghamii is not drought-tolerant, so in hot and dry seasons, water and mist the leaves and surroundings frequently to increase air humidity and keep the soil moist.
3. By no means let the potting soil become too dry or too wet, as this easily causes the lower leaves to droop and soften.
4. Apply fertilizer frequently. For potted Araucaria cunninghamii, it is best to use a mix of leaf mold, peat soil, clean river sand and a small amount of decomposed organic fertilizer. When new buds sprout in spring, apply 1-2 times a month of decomposed dilute organic liquid fertilizer and calcium fertilizer to keep the leaf color lustrous.
5. The diseases of Araucaria cunninghamii include leaf spot, branch blight and root nodule disease, etc. For leaf spot and branch blight, spraying with 70% thiophanate-methyl 8(” times solution or 65% zineb wettable powder 500-600 times solution can be chosen for control; for canker, smear with 40% asomate 100 times solution or potassium permanganate 1001〕 times solution for disinfection; for root nodule disease, soak with streptomycin 1000 times solution. The main pest is damage by scale insects; when only a few occur, rinse the leaves with clean water, and when more serious, spray with 40% omethoate emulsion 500-100() times solution to kill them.
How to grow Araucaria cunninghamii: growing methods and precautions
When it comes to Araucaria cunninghamii, I believe everyone is fairly familiar with it, because it is quite common in our lives; its figure can be seen whether in parks or rooms. Araucaria cunninghamii has extremely high ornamental value and is deeply loved by everyone, so do you know how to grow Araucaria cunninghamii correctly? Let's explore the correct care methods for Araucaria cunninghamii together below!
How to grow Araucaria cunninghamii
1. Soil: Araucaria cunninghamii is cultivated in Guangdong, Fujian, Hainan, Yunnan and Guangxi in China, and in the Yangtze River basin and the major cities to its north it is grown in pots and overwintered in greenhouses; the most suitable potting soil is a mix of 1/3 leaf mold, 1/3 garden soil and 1/3 river sand plus a small amount of base fertilizer.
2. Watering: Araucaria cunninghamii likes a humid environment. For this reason, in dry seasons and summer, attention should be paid to frequently spraying clean water on the leaves, which can both increase air humidity and keep the leaf color fresh and bright, and is very beneficial to its photosynthesis. During care, watering should be moderate; in summer watering should be sufficient to promptly replenish what is lost through leaf transpiration and avoid drought damage. But watering must not be excessive, causing water to accumulate in the potting soil; usually it is appropriate to keep the potting soil constantly moist.
3. Light: Araucaria cunninghamii likes plenty of sunlight. In northern regions, it is generally moved in early May to a south-facing balcony or a sunny spot in the courtyard, and after summer begins, appropriate shading should be provided to avoid direct sunlight. When grown in northern regions, it should be moved indoors at the end of September or the beginning of October, placed in a sunny spot, and watering controlled
4. Temperature: Araucaria cunninghamii likes a warm and humid climate and is not tolerant of drought or cold. It can grow under a variety of different temperatures, but its cold tolerance is not strong; the optimum growing temperature is 7-24°C. If the temperature rises, the air humidity around the plant should be increased.
5. Fertilizing: Araucaria cunninghamii grows relatively fast, so in its vigorous growing season it needs frequent topdressing to supplement the nutrients required for its growth. Generally starting from the sprouting of new buds in spring, take care to apply 1-2 times a month of decomposed dilute cake fertilizer water for it to absorb and use, so that it can grow robustly.
6. Pruning: Araucaria cunninghamii is prone to the gradual yellowing and shedding of the lower branches and leaves, causing the whole plant to be top-heavy and affecting its appearance; in care it should be carefully managed and necessary pruning carried out.
Growing methods for Araucaria cunninghamii
1. Light
Araucaria cunninghamii likes a growing environment with plenty of sunlight and prefers sunlight, but seedlings prefer shade; it needs plenty of sunlight in winter, while in summer it should be appropriately shaded to avoid direct sunlight.
2. Temperature
Araucaria cunninghamii likes a warm and humid climate and is not cold-tolerant; it grows best when the temperature is kept at 25°C-30°C. For indoor pot cultivation, it should be placed in a spot with good air circulation, and the room temperature must not be lower than 8°C.
3. Soil
Araucaria cunninghamii likes fertile soil. For pot cultivation, it requires a loose, fertile growing medium with relatively high humus content and strong drainage and aeration; it is best mixed from 3 parts loam, 1 part leaf mold, 1 part coarse sand and a small amount of plant ash, and the depth of the soil layer should be controlled so that the bud points that root in the upper layer are just exposed on the soil surface.
4. Watering
Usually the relative air humidity needs to be kept above 70%. Water frequently during the growing season, about 2-3 times a week, and it is best for the water to soak 10-15 cm deep; as Araucaria cunninghamii grows, gradually reduce the frequency of watering, always keeping the potting soil and the surrounding environment moist.
Precautions for Araucaria cunninghamii
1. Repot young trees frequently. Young Araucaria cunninghamii trees are best repotted once a year or every other year in spring, and plants over five years old are best repotted and have their soil changed once every two or three years.
2. Maintain environmental humidity. Araucaria cunninghamii is not drought-tolerant, so in hot and dry seasons, water and mist the leaves and surroundings frequently to increase air humidity and keep the soil moist. By no means let the potting soil become too dry or too wet, as this easily causes the lower leaves to droop and soften.
3. Apply fertilizer frequently. For potted Araucaria cunninghamii, it is best to use a mix of leaf mold, peat soil, clean river sand and a small amount of decomposed organic fertilizer. When new buds sprout in spring, apply 1-2 times a month of decomposed dilute organic liquid fertilizer and calcium fertilizer to keep the leaf color lustrous.
Growth habits
Araucaria cunninghamii likes light, while seedlings prefer shade. It likes a warm and humid climate and is not tolerant of drought or cold. It likes fertile soil. It grows relatively fast, has strong sprouting ability, and is strongly wind-resistant.
In winter it needs plenty of sunlight, and in summer strong direct sunlight should be avoided; it fears the dry gales of northern spring and the scorching sun of midsummer, and grows best under environmental conditions of 25°C-30°C and relative humidity above 70%. For pot cultivation, it requires a loose, fertile growing medium with relatively high humus content and strong drainage and aeration.
As mentioned above, Araucaria cunninghamii is one of the world's five major park tree species and is planted on a large scale all over the country, most commonly in parks. In fact, Araucaria cunninghamii is also extremely elegant as a potted plant; potted plants are relatively more compact and exquisite, and they look very beautiful placed in an office area or a room!