What are the care methods and tips for the Radermachera sinica?
Also known as pepper tree, Jiegu Liangshan, and mountain Radermachera. Trade names: Radermachera sinica, Kirin trumpet creeper. Native to valleys or open sparse woodlands at 300-850 m in Taiwan, China, Hainan, Yunnan, Guizhou, Guangdong, and Guangxi. A tree with bipinnate compound leaves, leaflets ovate, 4-7 cm long, apex caudate-acuminate. Flowers white to pale yellow, capsules 85 cm long, 1 cm thick.
Radermachera sinica varieties include Radermachera sinica 'Xiao'e', Guangxi catjang tree, and Yunnan Radermachera. The leaves of Yunnan Radermachera are densely covered with small white glandular dots on the upper surface and very small pits beneath. It likes warm, humid conditions and plenty of sunlight; it tolerates high temperatures but fears cold, prefers mild humidity and dislikes dryness. The optimum growing temperature is 20-30°C, the minimum winter temperature is 8-10°C. Cultivation should use loose, fertile, well-drained loam or sandy loam rich in organic matter. The flowering period is May to September, and the fruiting period is October to December.
Radermachera sinica can be propagated by sowing, cuttings, or layering. The potting medium is made up of 5 parts garden soil, 3 parts leaf mold, 1 part decomposed organic fertilizer, and 1 part river sand. When the temperature is above 30°C, it should be properly shaded and misted, or kept in a cool place for the summer. In winter it should be placed on a south-facing balcony with plenty of light; if the minimum temperature falls below 5°C it will suffer cold damage and drop a large number of leaves. Seedlings are shade-tolerant and need shading in summer. Radermachera sinica likes moisture and fears dryness; during the seedling stage keep the seedbed moist, and in hot, dry seasons pay even more attention to water supply. To prevent leggy growth, watering can be controlled when new shoots emerge in spring, keeping the potting soil moist; in summer and autumn spray regularly, and do not water too much to avoid waterlogging and root rot.
Potted plants are moved out and repotted every April; add an appropriate amount of decomposed cake fertilizer or 3% compound fertilizer as a base fertilizer to the potting soil, and during the growing season apply cake fertilizer water once a month or bury a multi-element slow-release compound fertilizer. In mid-autumn, apply 0.3% potassium dihydrogen phosphate 2-3 times in succession to increase cold resistance. When the summer temperature is above 32°C or the winter temperature is below 12°C, stop fertilizing. Leaf spot disease is easily contracted under high temperature and high humidity; use 50% carbendazim at 600 times dilution, once every half month, spraying 3-4 times in succession. For scale insects, use 40% Supesike at 1500 times dilution as a spray.
How to grow Radermachera sinica: How to care for Radermachera sinica
The cultivation methods for Radermachera sinica mainly include understanding its characteristics and habits, the various conditions needed for its growth, and common knowledge for its care. In this article, the editor mainly starts from these aspects to provide everyone with methods for growing Radermachera sinica and related knowledge for its care.Click to view "Radermachera sinica market prices"
I. Characteristics and tree habits of Radermachera sinica
Radermachera sinica is a tropical plant, also known as catjang tree, pepper tree, and mountain catjang tree. It has a graceful form and dancing leafy shadows, with small, emerald-green leaves. It is a precious indoor ornamental plant, mainly produced in the southern tropical regions of China. The bark of Radermachera sinica appears light gray. It likes high temperatures and high humidity and a sunny environment, tolerates high temperatures but fears severe cold.
II. Cultivation methods and growing conditions for Radermachera sinica
Bonsai cultivation scene of a small Radermachera sinica
1. Temperature:Radermachera sinica likes warm, hot environments; the optimum growing temperature is around 20 °C. When the temperature is very high (above 28°C), it should be properly shaded with a frame, and the minimum temperature should not be below 5 °C to avoid frost damage.
2. Light:Generally, Radermachera sinica can be grown in full sun or partial shade. However, for indoor potted Radermachera sinica, try to place it by a window or on a balcony with sufficient light; a long period in a dim environment will cause leaf drop.
3. Humidity:Radermachera sinica likes moist soil and air. When keeping it indoors at home, besides keeping the potting soil moist, you should also frequently mist the leaves, or spray the plant with slightly warm clean water to maintain its fresh appearance.
4. Substrate:For growing Radermachera sinica, choose a loose, breathable, well-drained substrate; sandy loam is best. The size of the pot can be determined by the size of the final plant. The cultivation method currently popular on the market is 1 to 2 plants per pot, with a plant height of over 70cm .Click to view "Propagation methods for Radermachera sinica"
III. Why is Radermachera sinica dropping leaves?
The emerald-green leaves of Radermachera sinica
Leaf drop in Radermachera sinica is mostly caused by uneven watering. Watering should not be too frequent or too dry; it should be dry-then-wet, otherwise yellowing and leaf drop will occur. It may also be due to insufficient light, poor ventilation, or dry indoor air. You can place it in an environment below 20°C for full-day exposure, and to prevent the leaves from turning yellow and dry, you can also sprinkle clean water on the leaves 2 to 3 times a day.
IV. Pest and disease control for growing Radermachera sinica
1. Aphids:The most common aphid is the green peach aphid. Symptoms include wrinkled and deformed leaves, usually with glistening honeydew spots, visible to the naked eye. Control methods include spraying with zinc phosphide, omethoate, and deltamethrin.
2. Mites:The main damage symptoms are new leaves wrinkling and curling, with an uneven leaf surface. It generally occurs from June to September; high temperature and dryness favor large outbreaks of this pest, while it occurs less under relatively humid conditions. Mainly use acaricides such as Miejing, Damanling, and Nissorun.
3. Scale insects:Under conditions of high temperature and high humidity with poor ventilation, especially in autumn and winter, scale insects easily appear on the stems and leaves of Radermachera sinica. When live insects are found, they can be promptly wiped off with a damp cloth, or removed by sticking them off with clear tape.
Radermachera sinica cultivation pictures
4. Leaf spot disease:In environments with high temperature, high humidity, and poor ventilation, its leaves are prone to leaf spot disease. The control method is to strengthen ventilation and light transmission and avoid water lingering on the leaf surface for long periods. For disease spots appearing on a small number of leaves of individual plants, apply Dakining cream.
V. Pruning methods for Radermachera sinica
For pruning Radermachera sinica, the best approach is to carry out a comprehensive shaping before it sprouts in spring. If you want it to produce more side branches, you can pinch out the growing tips. If you want thick, strong stems, pay attention to applying more potassium-rich fertilizer and spray water on the stems and leaves when watering.
VI. Radermachera sinica is not suitable for the bedroom
Most indoor plants carry out photosynthesis during the day to produce oxygen, but at night, without light, they instead absorb oxygen. So if Radermachera sinica is placed in the bedroom, at night it will compete with people for oxygen, which is bad for sleep quality. It is more suitable for the living room. For more exciting reading, click to enter the Tubatu flower column
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How to care for Radermachera sinica, so beloved in homes and offices?
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[Common questions]How to care for Radermachera sinica, so beloved in homes and offices, which likes high temperature and high humidity and plenty of sunlight?
Expert answer
1. Temperature: Radermachera sinica likes warm, hot environments. The optimum growing temperature is 20°C-21°C during the day and 18°C-19°C at night. Even in midsummer, try to keep the temperature below 27°C. When the ambient temperature is very high, provide proper shading with a frame and increase the humidity of the environment and leaf surface. During overwintering, it is best to maintain a greenhouse temperature of no less than 8°C, and the minimum must not be below 5°C to avoid cold damage.
2. Light: Radermachera sinica is a light-loving plant, and can also tolerate shade somewhat. Either full sun or partial shade is acceptable. However, do not let direct sunlight hit it in summer; provide shading with a frame. When placed indoors as a potted plant, it is best to put it by a window or on a balcony with sufficient light to receive partial shade or scattered light. If it is kept in a dim indoor place for a long time, it easily drops leaves. When grown in pots at home, during overwintering it can be placed in a higher position by the window or at the front of the balcony to let it receive more light.
3. Humidity: Radermachera sinica likes relatively moist soil and growing environment. Air humidity should generally be kept between 70-80%, and should not exceed 85% at most. If kept at home, you can frequently spray the plant with slightly warm clean water to maintain its fresh appearance and also increase environmental humidity.
4. Substrate: Choose a loose, breathable, well-drained substrate. You can use the imported substrate now available, or mix domestic peat soil with perlite and vermiculite, or use a mix of leaf mold and river sand. The cultivation method currently popular on the market is 1 or 2 plants per pot, with a plant height of over 70 cm per pot.
5. Fertilizer: Radermachera sinica grows relatively quickly and needs sufficient nutrients to ensure vigorous growth, so during the growing period it needs frequent fertilizing. Generally, a mixed fertilizer with an N-P-K ratio of 20-10-10 or 15-15-15 is sufficient. You can also use diluted weak fertilizer water instead of clean water to water the potting soil. Editor's note: The scientific name of Radermachera sinica is catjang tree; it is a tree of the Bignoniaceae family and the genus Radermachera. It is a medium-sized deciduous tree; the trunk can grow to over 15 m. It has bipinnate to tripinnate compound leaves, with a leaf rachis about 30 cm long and hairless. The middle leaflets are opposite, ovate or ovate-lanceolate, 4-7 cm long, apex caudate-acuminate, entire margin, hairless on both sides, and the petiole is hairless.
Radermachera sinica is native to the tropical and subtropical regions of southern China. It likes high temperature and high humidity and a sunny environment. It tolerates high temperatures, fears cold, prefers moisture, and avoids dryness. For cultivation, use loose, fertile, well-drained loam and sandy loam rich in organic matter.