New Products in Du Fu——Thermian Rhododendron
The heather rhododendron is also known as the tree-shaped rhododendron, alpine rhododendron, and ocean heather. It is one of the most popular potted plants in recent years. This species was introduced from the Netherlands, Belgium and other countries. Compared with the common rhododendron varieties such as spring bristles, summer bristles and western oysters, the flowers are large and intensive. When in full bloom, they look like a large flower ball, giving people a feeling of luxuriance, suitable for large and medium-sized potted plants, decorative halls, and restaurants. Hotels, etc., magnificent.
Rhododendron azalea is a perennial evergreen shrub or small tree of the azalea branch. It has many branches, a full crown, and a compact plant type; leaves are alternate, densely borne at the top of the branches, and leaves are elliptical or lanceolate, and the leather is shiny. Some varieties also have gold-colored stripes or borders on the leaf surface; the leaves are slightly lighter in color and densely covered with hairs. The rhododendron's inflorescence is in the form of an umbrella-like shape, with a flower at the top, a constant flowering cluster on the branch, and a bulbous shape in full bloom. Its diameter is usually 15 cm to 20 cm, and individual species can reach 25 cm or more; flower bell-shaped, single Petals or double flaps; rich colors, purple, red, pink, orange, pink, purple blue, white, yellow and other colors. The natural flowering period is from March to May. Artificial flowering can be opened in advance from January to February. The flowering period of each plant can reach one month.
Rhododendron azaleas is a temperate alpine plant. Most of the species are native to the southwestern part of China, and are mainly distributed in mountainous regions with altitudes of 2,000 to 4,500 meters above sea level. Heather Du Yuxi is a cool and humid half-negative environment. It has certain cold resistance. The optimum temperature for growth is 15°C～25°C. It is not tolerant to drought, afraid of intense heat and sun exposure, and also afraid of stagnant water. The flowers can be cut off after the flowers are spent each year. After the flowering period, the branches are shortened to promote the growth of leaf buds. Watering should follow the principle of "do not do it, do it with pouring," and avoid basin water and excessive drought. If the air is too dry, spray water on the plants and their surroundings to increase the air humidity. During the growing season, a decomposed manure fertilizer is applied every 10 days to 15 days, and the solid compound fertilizer can also be sprinkled on the surface of the basin soil, and the roots can be slowly absorbed by the roots.
The hot summer heat is extremely unfavorable to the growth of Rhododendron. When the temperature exceeds 30°C, the growth of the plant is inhibited. When the temperature exceeds 35°C, the plants will suffer heat damage of different degrees. Therefore, in the summer, the plants can be moved to a cool, shaded shed for conservation and ventilation, so as to avoid disease in the hot environment. When the plants are hot and dry, they can be sprinkled with water to reduce the temperature and humidity. In the rainy season, it is necessary to avoid the accumulation of water in the basin, so as not to cause rot and stop the fertilization. After the cool season, normal water and fertilizer management can be resumed, and light can be increased appropriately. The high temperature throughout southern China is not conducive to the growth of rhododendron, especially in summer when high temperatures are not conducive to the maintenance of death. It is necessary to move it to a cool place for cultivation in order to survive the hot summer months.
Rhododendron lucidum is placed in a sunny place in winter and can withstand low temperatures of 0°C. Therefore, the best growth temperature in winter is controlled below 15 °C to avoid excessive temperature, affecting flower bud differentiation. Every 1 to 2 years, potted ornamental rhododendrons are changed once. After the change of pots is performed after flowering, loose soil, abundant humus, and well-drained slightly acidic sandy soil are suitable for potting soils. It can be mixed with rot-leaf or peat soil plus vermiculite or river sand, and the pH of pot-land should be adjusted. Between 5 and 6.0.
Rhododendron can be used for cutting or cutting after flowering. For large-scale propagation, tissue culture is used. Do not press the substrate too hard when the new strain is on the pot, make it breathable, and do not prune. When the root system is developed and the top bud begins to grow, pruning is performed to promote branching and make the plant type full and compact.
In the high-temperature and high-humidity environment, rhododendron heather is prone to stalk rot and brown leaf spot, and can be sprayed with carbendazim or thiophanate-methyl for control. Soil iron deficiency and partial alkali can also cause yellowing disease in plants, and black earthworm (ferrous sulfate) can be added for prevention during watering and fertilizing. Insect pests mainly occur in summer and autumn seasons, such as spider mites, army parasites, and can be sprayed with 1000-1500 times of 40% omethoate.
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