There are more than 900 species of rhododendrons in the world, and the horticultural varieties of rhododendrons are all descendants of rhododendrons through hybridization or bud mutation. In the past century, there were nearly ten thousand horticultural varieties in the world.
In the 1920s-1930s, China introduced rhododendrons from Japan, Europe and America for cultivation, and bred a few new varieties through hybridization, such as "Multicolor Imitation of Rhododendron occidentalis" and "Laughing at Erqiao" cultivated in recent years, as well as new hybrid varieties of rhododendrons in alpine deciduous areas such as red butterfly, purple butterfly and white butterfly.
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Maintenance/curing
Rhododendron requires the soil to be wet, not wet. Rhododendron planted in the open field can be watered every 2-3 days in spring and autumn, and at least once a day in hot summer.
Do not use alkaline water for daily watering, and pay attention to the water temperature not to be too cold when watering, especially in hot summer, when watering thoroughly with cold water, the soil temperature suddenly drops, which affects the water absorption of roots and interferes with the physiological balance of plants.
After planting and soil improvement, water 1 time to make the roots fully contact with the soil, which is beneficial to the survival and growth of the roots. Pay attention to watering during the growth period, and gradually increase the amount of watering from March, especially in summer, always keep the basin soil moist, but don't accumulate water. Reduce watering after September, and then water after entering the house in winter.