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Rhododendron species introduction: What kind of plant is the Chinese azalea (Rhododendron molle)
It belongs to the subgenus Rhododendron subg. Pentanthera. Deciduous shrub, 0.5-2 m tall. Branchlets slender and sparse. Covered with soft hairs and bristles. Leaves papery, tender green, long elliptic-lanceolate, 5-12 cm long, 2-4.5 cm wide, apex obtuse, with a protruding tip, base cuneate, margins ciliate, petiole, leaf surface and leaf underside all covered with soft hairs. Terminal racemose umbel, with 5-9 flowers, blooming in early May, about 10 days later than the red azalea (Rhododendron simsii), flowering before leaves or flowers and leaves appearing together, corolla broadly campanulate, 5-6 cm in diameter, golden yellow to orange-yellow
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Management methods and technical key points after rhododendrons bloom
Pruning and shaping: after rhododendrons finish blooming, the spent flowers generally need to be removed by hand, followed by appropriate thinning of branches, cutting away overly dense branches, and letting them send out new growth. Fertilizer and water management: in northern regions, water is on the alkaline side and relatively hard, and watering plants with it over the long term can easily cause soil alkalization, affecting flower growth. Therefore, before watering, the water should be stored in a container for more than 24 hours and used after the chlorine has evaporated. Alternatively, water mixed with an appropriate amount of ferrous sulfate or edible white vinegar can be applied about once every 10 days. Rhododendrons do not need much fertilizer, and it is generally applied along with watering. You can
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Detailed Explanation of Rhododendron Tissue Culture and Cultivation Management Techniques
As a high-grade ornamental flower, rhododendron is not easy to propagate and grow in North China. This is mainly because most of the soil in North China is alkaline, while rhododendrons prefer typical acidic soil, thus making propagation and planting somewhat difficult, and they can only be grown as greenhouse flowers. Rhododendron propagation methods include seed sowing, cuttings, layering and grafting, and tissue culture. Tissue culture does not require seeds; it only needs the stem tips of the current year's branches of the rhododendron. In a very short time, a large number of small rhododendron seedlings can be cultured in test tubes, and it is not restricted by season.
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Detailed Explanation of Rhododendron Cultivation Techniques and Landscape Application
China has a long history of rhododendron cultivation, with records of artificial cultivation dating back to the Han Dynasty. In the Tang Dynasty, rhododendrons began to be used in private gardens, and because of their graceful plant form and brilliant flower colors, they were deeply loved by people. Rhododendron generally refers to plants of the genus Rhododendron in the family Ericaceae, with about 960 species worldwide. China is the birthplace and distribution center of rhododendrons, with about 542 species, mainly distributed in the Hengduan Mountains area of the three provinces and regions of Southwest China, Yunnan, Tibet and Sichuan. Rhododendrons prefer cool conditions and fear scorching sun,
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Key points of seedling-raising techniques for Japanese white pine, rhododendron and other seedlings
Seedling raising of Japanese white pine, rhododendron, etc. For Japanese white pine, in autumn mix the seeds with coarse sand at 1:5, put the mixture in a flower pot and bury it outdoors in a sunny, well-drained spot, and sow around Qingming Festival. Broadcast sow on the seedbed, cover with 1 cm of sandy loam, and generally the seedlings can emerge completely in two months. If the quantity of seeds is very small, soak the seeds in warm water in spring; after 2-3 days, carefully break open the outer seed coat, sow in pots at 25°C, and seedlings can emerge in about 10 days. For rhododendron, when propagating wild rhododendrons or breeding new hybrid cultivars, the sowing method is often used to raise seedlings. Rhododendron
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Detailed Explanation of Fertilizing and Watering Methods for Alpine Rhododendrons
There are many opinions on the issue of fertilizing alpine rhododendrons. Based on our practice in recent years, the traditional Chinese method of concentrated fertilizing should be changed and replaced with "light fertilizer applied frequently," that is, balanced fertilizing with every watering, with special attention to the N:P:K ratio at different growth and development stages, because it has a relatively large impact. Every effort should be made to carefully test and analyze with each watering so as to formulate the most ideal pH value and EC value. We conducted a large number of experiments at different growth stages, for example, making 12 gradients from pH3.8 to 7.1
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How to fertilize rhododendrons? Five key points to note
Rhododendron roots are delicate, so fertilizer must be fully composted before use. Generally, fertilizer that has been composted for more than one year and fully fermented is most suitable. When fertilizing, pay attention to the following five key points: Feed according to the seedling. Seedlings cannot be fertilized; after 4 months, a well-composted, extremely dilute liquid manure may be applied. After the plants are set out and transplanted separately in the following spring, more nitrogen and potassium fertilizer should be applied to speed up vegetative growth. At 2 to 3 years, during the mature stage, more phosphorus fertilizer should be added to achieve a high flowering rate and large, brightly colored flowers. In the old stage, more nitrogen fertilizer may be applied to promote renewal of branches and leaves and rejuvenate the tree
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What are the control methods for red spider mites on rhododendrons?
The female adult is about 0.3 mm long, dark red, nearly oval, with a raised back and 4 pairs of dark red legs; the male adult is 0.25 mm long, wedge-shaped, flat and bright red. It produces multiple generations a year, and the adults overwinter at the base of the plant. They mainly cause damage on the underside of leaves near the midrib close to the petiole. During the high-temperature, low-rainfall, dry weather of June to July, they reproduce quickly, and when their numbers are high, the damaged leaves scorch and drop off. Control methods: manual control - check frequently after April, and if red spider
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What are the common pests and diseases of rhododendrons?
Rhododendron black spot disease, also called brown spot disease, is a common and frequently occurring leaf spot disease of rhododendrons. After infection, black spots form on the leaves, which gradually dry up and fall off until the plant dies. The disease mainly affects rhododendron leaves and is caused by infection with the fungus Cercospora rhododendri. The pathogen first appears as several small brown spots; as these spots continually expand, the lesions join together into patches, producing grayish-brown mold mycelium. The affected leaves begin at the petiole, turn from green to brownish-yellow and drop early, and in severe cases this affects the growth and development and ornamental value of the rhododendron. The pathogen overwinters on leaves or diseased plants.
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Repotting rhododendrons after flowering has its particularities; only by mastering the method can they survive well
When choosing a pot, select a suitable pot according to the size of the plant, with clay pots being best; generally the pot diameter (inner diameter) should not exceed half the crown diameter. Rhododendrons prefer acidic soil, requiring a pH of 4.25-5.5; without maintaining this acidity, potted rhododendrons are very difficult to keep alive, and the potting soil must be loose, well-draining and rich in humus; never use heavy clay soil. When using soil, it is best to prepare it according to the original root-ball soil of the rhododendron; plants previously grown in pine-needle soil should still use pine-needle soil, which can be mixed with a small amount of decomposed horse manure and bone meal, and
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