How to grow azaleas well in the north

Azaleas are one of the top ten famous flowers in our country, suitable for both potted and ground planting. How do you grow azaleas well? First, you need to understand the conditions required for their growth and development. Azaleas have "six likes" and "six dislikes", namely:

(1) They like coolness and dislike intense heat;

(2) They like semi-shade and dislike blazing sun;

(3) They like moisture and dislike dryness;

(4) They like acidic soil and dislike alkaline soil;

(5) They like light-textured soil and dislike heavy clay soil;

(6) They like good drainage and dislike waterlogging. After being moved outdoors in spring, when the sunlight is relatively soft, appropriate shading should be provided around midday. After summer begins, place them in a ventilated and shady spot; in the hot summer, shade them with reed curtains, bamboo blinds or shade netting, and open the curtains before 8 a.m. and after 5-6 p.m. Since azaleas are semi-shade-loving flowering shrubs, their young leaves are easily scorched under blazing sun exposure. If kept under direct strong light for a long time in summer, the branches and leaves will turn yellow and withered, growth will stagnate, and in severe cases the whole plant will die. In autumn, the intensity of sunlight gradually softens; before 9 a.m. and after 5 p.m., they can be exposed to a bit more sunlight, and in late autumn place them in a sunny spot to promote flower bud differentiation. Azaleas are not cold-tolerant; between the Cold Dew and Frost's Descent periods they should be moved indoors and placed in a sunny spot. In the early stage after moving indoors, care should be taken to open the windows and doors for ventilation. If they are kept in a shaded place for a long time, they are prone to dropping flower buds. In winter, the indoor temperature should preferably be around 10°C. For most varieties, the indoor temperature should not be lower than 5°C, but Western azaleas are sensitive to cold, and the overwintering indoor temperature must not be lower than 8°C. If the indoor temperature is too high in winter, metabolism increases, nutrients are consumed, and this is detrimental to growth and development the following year.

In the northern regions, spring is dry with many dry winds, summer is hot and scorching with excessive sunlight, the soil is mostly on the alkaline side, and the groundwater also mostly contains salt and alkali. Such environmental conditions cannot meet the requirements for azalea growth, and will inevitably lead to poor growth, small leaves and yellow flowers, and dry, shrunken branch tips that eventually slowly wither and die.

To grow azaleas well in the north, you need to work hard to create suitable growing conditions based on their ecological characteristics. In summary, there are the following points:

(1) Use acidic soil. Azaleas like acidic soil, with pH4.5-6.5 being suitable. The potting soil should be loose, well-drained and rich in humus. A commonly used mix is 6 parts leaf mold, 2 parts peat soil and 2 parts river sand, mixed evenly, or pine needle soil can be used.

(2) Improve water quality. The water used for watering flowers should preferably be water free of minerals, such as rainwater or snow water. During the azalea growing season, generally apply alum fertilizer water once every 10-15 days, and alternately spray the leaves with a 0.1%-0.2% potassium dihydrogen phosphate solution. In short, timely shading and exposure to light, maintaining soil acidity, and controlling air humidity are the keys to growing azaleas well in the northern regions.