Flower control technology of rhododendron
Azalea, also known as azalea and rhododendron, can be divided into 4 categories according to flowering period and introduction source: hairy rhododendron, summer rhododendron, eastern rhododendron and western rhododendron. The flowering period varies with different varieties. If the artificial regulation of its temperature, humidity and other conditions, according to personal preferences, so that it can advance or delay flowering time.
1. Early flowering: The flower buds of rhododendrons generally begin to differentiate in autumn. In the cold season of winter, azaleas are moved to greenhouse cultivation, maintained at room temperature of 20-25 DEG C, and often sprayed with fine sprayers on branches to maintain high humidity, and dense flowers can be opened after 45-50 days; if it is necessary to flower earlier, it is necessary to give 1-2 weeks of low temperature treatment before entering greenhouse cultivation, and the temperature is controlled below 0 DEG C. After moving to greenhouse warming culture, and often spray water, late December or early January can bloom.
Delayed flowering: azaleas in the bud formation, if it has been kept in a low temperature state, it will not flower temporarily. The specific method is to put the plants that form buds into cold rooms in early March to avoid the natural rise in spring temperatures and bloom. Cold room temperature can be maintained at 1-3℃, watering when the pot is dry, can be checked once every 10 days. If the storage period is long, a light should be set up in the cold room to enable photosynthesis. The date of removal from the cold room, y, should be calculated according to the date of flowering and the temperature conditions at that time. Those that bloom between July and October are removed about 15-20 days before the desired flowering date. The time should be taken out after 4 p.m. or before 9 a.m., after taking out should be placed in the shade, cool, windproof place culture, and then spray water on the plant, wait 4-5 days to recover vitality, and then see more sunlight. Some thin fertilizer can also be applied to make it bloom luxuriantly, flowers and lasting, although the hot days during the flowering period can still maintain 20 days without withering.
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What is the reason for the withered and yellow azaleas
Poor management of rhododendron flowers in the first year often leads to withered buds in the second year. When the cuckoo blossoms, people like to watch it indoors, but the air is not fresh and there is not enough sunshine. The climate in Shanghai is too warm, so it can be moved outdoors at night and placed in the indoor light place in the morning and evening. After the flowers fade, gradually increase the time to be placed outdoors, and a week later, you can put them in a shaded place outside and cut off the residual flowers in time. Nitrogen-based liquid fertilizer was applied every 10 days to promote new shoots. The weather is hot from June to August, the growth of rhododendron is slow, and fertilization can be stopped. Late September, every 10 days
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How to manage the azaleas after blooming
After pruning and plastic rhododendron blooming, it is generally necessary to manually remove the residual flowers, and then carry out appropriate thinning, cut off the dense branches and let them re-branch. Fertilizer and water management in northern China, the water is alkaline and hard. Long-term watering of flowers is easy to cause soil Alkalization and affect the growth of flowers. Therefore, the water should be stored in a container for more than 24 hours before watering, and then used after chlorine volatilization. It can also be watered every 10 days or so with the right amount of ferrous sulfate or edible white vinegar. Rhododendron does not need much fertilizer, it is usually fertilized with water, and can be applied from late spring to early spring.
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