What are the cultivation methods for the four-season azalea?

The four-season azalea is a variety of the evergreen or semi-evergreen shrub azalea of the genus Rhododendron in the family Ericaceae, also known as the Belgian azalea. Its petals are narrow and long, the filaments are red, and the anthers are golden yellow. It blooms continuously throughout the four seasons and is an excellent flowering ornamental plant, suitable for mass planting or potted display. Now let us take a look at the cultivation methods and precautions for the four-season azalea!

Propagation Techniques for the Four-Season Azalea

The four-season azalea is mainly propagated by cuttings. In spring and summer, select two-year-old branches with short nodes and thick, sturdy growth, cut them into sections about 5 cm long for insertion, leaving 3 to 5 leaves at the top. Sand and perlite are good cutting media. Shade is required, and water should be sprayed frequently. After cutting, roots form in about 1 month, and the plants can be potted up in 3 months. The survival rate reaches over 90%. The potting soil should be an acidic culture soil of the same period, permeable and rich in organic matter, with a pH value of 5 to 6. It is commonly made by mixing leaf mold, moss and mountain soil in a ratio of 2:1:7.

Cultivation Methods for the Four-Season Azalea

1. Watering: The roots of azaleas are very fine and have poor absorption capacity, and water must be absorbed through the roots to reach the flowers. Therefore, except during the winter dormant period, azaleas should be watered frequently to keep them moist. Especially during the growth period after March each year, the flowering period, and the high-temperature period from July to September, the frequency of watering should be increased, preferably ensuring watering about twice a day. In autumn and winter, watering can be appropriately reduced. It should be noted that tap water used for watering flowers is best stored in a container for one to two days before being used to water the flowers.

2. Light: During the cultivation of azaleas, sufficient light should be ensured at all times, because only with sufficient light can the flowers bloom well. Of course, in the hot summer, they should not be put out for direct exposure to the sun. Instead, shading should be strengthened to prevent them from being damaged by the sun. In addition, during the flowering season, appropriate protection should also be provided, and a shade net can be used for protection. They also must not be exposed to direct sunlight during the flowering period.

3. Fertilizing: Proper fertilizing can make azaleas grow more robustly and rapidly. As with most indoor flower cultivation, the fertilizing principle for azaleas is also light fertilizer applied frequently, that is, applying a little less at a time but applying it several more times. When old leaves turn green, during the flowering period, and after flowering, fertilize appropriately two to three times. During hot high-temperature weather, do not fertilize at all. For fertilizing azaleas, materials such as grass juice water, fishy water, and rapeseed cake can be used.

4. Placement: Large potted four-season azaleas are colorful when in bloom, with flowers covering the tree, and can be placed at the entrances of hotels, shops, or government offices, appearing extremely noble, elegant, and magnificent, with an ornamental effect superior to that of sago palms and similar plants. Medium-sized four-season azaleas are dazzlingly beautiful when in bloom and can be placed on office desks or coffee tables indoors. If used to decorate a meeting room, they have an invigorating effect, as if entering a place where spring lasts all year. Small four-season azaleas, however, are generally not for ornamental display and should preferably be cultivated in a concentrated way, best grown in plastic greenhouses, and once they grow into medium-sized plants, they can be sold or used for viewing.

Precautions for the Four-Season Azalea

1. Pest control: The most common pest on four-season azaleas is the red spider mite, which is caused by dry heat. Red spider mites suck leaf sap, causing the whole plant to gradually yellow and wilt. Routinely check the undersides of leaves. If some reddish-brown spots resembling "mites" are found, these are red spider mites, and there will also be webbing. At this time, the four-season azalea should first be isolated, and the affected leaf undersides should be washed with relatively strong water pressure through a rubber hose. After it dries slightly, more than ten fresh oleander leaves can be crushed, added with five cigarette butts (taking only the tobacco, about the amount of one cigarette) and one chopped raw red chili pepper, soaked in 500 ml of water for twenty-four hours, and sprayed on the stems and leaves every three days, while placing the plant in a ventilated place to dry, spraying three times in succession. In daily care, keep it moist and ensure air circulation.

2. Yellowing leaves: Yellowing leaves on four-season azaleas is a physiological disease caused by a lack of iron, trace elements, and soil that is too alkaline. All azaleas prefer slightly acidic soil, which should be loose and well-drained, and must not become compacted. In severe cases, the soil should be replaced, mixing packaged "potting soil", peat soil and black soil (leaf mold) in three equal parts. In mild cases, several rusty iron nails can be buried in the soil.

3. Early withering of flower buds: The leaf tips and edges of four-season azaleas will also curl and turn yellowish-brown at the same time. This is caused by applying concentrated fertilizer when there are flower buds, or by hot stuffy conditions with poor ventilation, or by excessive dryness, or by compacted soil. When buds appear, fertilizing should be stopped, and the plant should be placed in a cool, airy place with only sufficient scattered light, avoiding scorching sun. The potting soil should be kept appropriately moist and not dry, and the soil should be replaced once every year after the flowers fade. Affected buds and leaves should be removed.

4. Brown spots on leaf edges: Brown spots on leaf edges are the main disease of four-season azaleas, called brown spot disease, caused by excessive moisture, lack of light, and hot stuffy conditions. Diseased leaves should be removed, and a 600-fold solution of "Daconil" should be sprayed once a week, three times in succession.