How many degrees of cold tolerance are potted rhododendrons, and how to protect potted azaleas from

1. What is the minimum cold tolerance of azaleas.

Rhododendron can tolerate the lowest cold of about minus 10-15, has good cold resistance, and can resist low temperatures in winter. There are many varieties of rhododendrons, different varieties have different cold tolerances, most of them can overwinter normally, deciduous rhododendrons can tolerate low temperatures of minus 20-30, evergreen rhododendrons can tolerate low temperatures of minus 10-15, and general western cuckoos can tolerate low temperatures of minus 3. Although azaleas are very cold-resistant, in the low-end low temperature environment, if they do not take warm and cold measures, azaleas may also be frostbitten and freeze to death.

Second, the method of overwintering azaleas.

1. Outdoor maintenance: If the azalea is raised in the southern region.

It can be placed in an outdoor environment normally, and there is no problem with open-air maintenance. You can choose a sunny and leeward location, place the azaleas, and if you are worried about frostbite at low temperatures, you can bury the pots deep in the soil.

2. Indoor maintenance: If the azalea is raised in the northern region.

The weather outside is cold, so you can put it indoors to keep the temperature at 10 degrees Celsius.

All of the above is sufficient. Be careful not to put azaleas next to heating or air conditioning.

3. Sufficient light: In winter, azaleas can be kept in a place with sufficient light.

4. Control watering: You don't need to water the azaleas often in winter, just about five days or so. In addition, Bicagen can also be used to improve the cold resistance of the cuckoo.

Rhododendron prefers a cool climate, and most of them have a certain ability to tolerate cold. Its optimal growth temperature is 12 25, when the temperature exceeds 30, the growth is slow or semi-dormant, the temperature is lower than 5 and enters the dormant period, and below -3 there will be frost damage.

Extended Links. Rhododendron is an evergreen or deciduous shrub of the Rhododendron family. Rhododendron is widely distributed in China and is extremely rich in germplasm resources.

Of the more than 900 species of rhododendrons in the world, more than 530 species are native to China. Rhododendron is one of the top ten famous flowers in China. Among all ornamental flowers and trees, it can be called beautiful flowers and leaves, and it is suitable for ground and potted plants, and it is the most widely used.

For a long time, horticulturists have crossed and bred countless horticultural varieties.

Classification of horticultural varieties.

Due to the lack of clear definition standards for the classification of rhododendron horticultural varieties in China in the past, coupled with the lack of variety registration, the classification of rhododendron horticultural varieties in China is not uniform at present, and they are only roughly divided into several categories according to their flowering period, flower type, plant shape, leaf shape, introduction place and traditional habits: spring cuckoo (eastern cuckoo), hairy cuckoo, summer cuckoo and western cuckoo. However, there are also some areas where spring cuckoos (eastern cuckoos) and hairy cuckoos are combined to form spring cuckoos according to the flowering period.

Because the rhododendron bonsai is suitable for the rhododendron varieties with flowers first and then leaves, small leaves, small flowers and dense flowering, the cultivation of Jiashan rhododendron is mainly based on the spring cuckoo (Dongjuan) that is consistent with the above characteristics.

Jiashan rhododendron bonsai draws on the modeling techniques of Yangpai bonsai "cloud piece", absorbs the pruning skills of Lingnan bonsai "cutting dry and storing branches" and "shrinking the dragon into a ruler", and at the same time inherits the artistic style of Zhejiang bonsai "heavy wind bones, Shangqi rhyme", showing the beauty of prudence, stability and dignification, without losing the heroic, free and easy, unrestrained atmosphere.

After absorbing the strengths of others, Jiashan rhododendron bonsai has gradually formed its own unique artistic style: although the shape of the big branch is layered, it does not deliberately emphasize the layer, does not require unity, and tries to follow the trend according to the trunk, which is natural. The volume of bonsai does not blindly seek to be large, but pays attention to the overall beauty.

In particular, the Jiashan rhododendron bonsai gives full play to the characteristics of the spring rhododendron flower shape is small and dense, and the flower color is gorgeous and colorful.

Evergreen rhododendrons are generally hardy, but potted azaleas are not as hardy as ground grown. In particular, deciduous rhododendron varieties will turn the leaf color of some varieties yellow or dark red when the temperature drops to 0, and cause defoliation. Cuckoo is less cold-tolerant, losing its leaves after frost and freezing the trunk cortex at temperatures of -6.

Therefore, in the north, it is necessary to enter the greenhouse in winter; South China has a warm climate and can be outdoors all year round; The following conditions can be used in East China to make rhododendrons safely overwinter.

1) Low temperature greenhouse: no heating in winter, occasionally -2 -3 low temperature, no frost damage, home cultivation can be placed in the sunny room.

2) Balcony corridor: all the balconies are enclosed, which is equivalent to a greenhouse.

3) Wind barrier: In the northwest of the cultivation site, use reed curtains to create a thick barrier, high meters, facing south can place azaleas, especially cold, the pot surface is covered with straw or perlite, or the pot is half buried in the soil, you can spend the winter.

4) Plastic greenhouse: This facility is used in large-scale production, covered with double-layer plastic film on all sides, and ventilation should be turned on when it is sunny and hot at noon.

5) Glass floor box: suitable for family use, add straw curtain when cold, and open the window to adjust when the temperature is high.

Rhododendron tips for wintering.

1. Temperature: The temperature in winter is low, so it should be kept indoors for maintenance. The indoor temperature should be kept above 3 degrees, if the indoor temperature is too low, it will also cause damage to the cuckoo.

2. Light: Indoor maintenance should be placed in a place where the sun shines. The winter sun is mild, and the azaleas are perfectly exposed to full daylight. If the weather is sunny and the temperature outside can reach more than 3 degrees, you can move it outside to bask in the sun, and then move it indoors in time in the evening.

3. Watering: In winter, you should try to water as little as possible to avoid soil freezing. If you find dust on the leaves, wash them off with water in time to prevent the phenomenon of falling leaves.

Rhododendron is not afraid of freezing in the wild, and it still does not die in the winter in the alpine area, but the potted rhododendron has poor cold resistance, and can usually be moved indoors in winter to prevent freezing, and can be moved out of the outdoor planting when the temperature rises in spring, and the current weather has little impact when it is placed outdoors.

In the winter, the temperature is also very heavy.

Bai wants, but different varieties.

The temperature requirements of the rhododendron are not the same, the spring cuckoo, the summer cuckoo and the hairy cuckoo are relatively cold-resistant, and the temperature in winter should not be lower than 0.

Therefore, when cultivating rhododendrons in winter, it is better to keep the temperature at 8-10. Indoors, air conditioning and heating should be the principle. In winter, there is no need to fertilize azaleas, but in January they should be fertilized once, either in bean cake or bone meal.

The bonsai of azaleas needs to be modeled by pruning and binding, and can also be moderately pruned in winter, mainly for thinning and stubbing, cutting off the over-dense branches and the diseased and weak branches of the long branches.

It can withstand the cold.

Although rhododendrons like to be cold, they should pay attention to heat preservation in winter after turning over the pot. If there is no greenhouse, you can build a small shed in a south-facing sunny and ventilated place, and cover it with plastic film to survive the winter safely.

Rhododendrons do not die in winter, but do not bloom.

Rhododendron habits range from evergreen to deciduous and range from low ground cover to tall trees. The first cultivated in the mid-17th century for garden viewing was the densely haired alpine rhododendron (rhirsutum), which can reach a height of 1 meter (3 feet).

Others range from mat-like dwarfs as tall as only 10 cm (4 in) to trees more than 12 m tall, such as R. creeping rhododendron native to Yunnan, Chinaprostratum), the latter such as the tree-shaped rhododendron (rarboreum), R. sylvestris (R. arboreum).

Barbatum) and Rhododendron (R., a large tree native to Asia giganteum)。Except for the species of Yingshan red, the leaves are thick, leathery, and evergreen; The flowers are usually cylindrical to funnel-shaped, and the color varies greatly, including white, yellow, pink, crimson, purple and blue.

Rhododendron will not be raised in autumn and winter? If you master these skills well, your cold resistance will be improved, and wintering will be easy.

OK! Our azaleas are all on the top of the mountain! I'm not afraid of snow and ice!

Rhododendron open-air planting is suitable for the lowest temperature can not be lower than 12 degrees Celsius, the temperature is too low will cause frostbite, the temperature will be dormant if the temperature exceeds 35 degrees, and the light will be sunburned if the light is too strong.

Rhododendron is a deciduous or evergreen shrub. There are about 960 species of Rhododendron in the world, and more than 570 species in China. There are many kinds of rhododendrons, and the flowers are gorgeous, they can be called "garden dancers", suitable for ground plants and potted plants, and they are one of the top ten traditional famous flowers in China.

Anku Rhododendron is a new category of azalea that came out in 1996, and it is also a well-known rhododendron brand, with more than 30 varieties.