Yellow azalea leaves

Question: Yellow azalea leaves

Hi everyone ... I recently got an azalea bonsai and I keep it on the balcony ... I find myself in reggio calabria here it is still hot ... for some time I have known that some of its leaves are weak and turn yellow ... can anyone tell me what to do to remedy? ?
another question I do well to vaporize it or not ?? someone tells me ke is not good ...

Answer: Yellow azalea leaves

Gentile Luciana,
the azaleas are among the most used plants in Japan to form bonsai; the fact that these plants produce small leaves, and even small flowers, with wrinkled and twisted stems, make them perfect bonsai, with great satisfaction for growers. Unfortunately they are not plants of very easy cultivation, and in my opinion they are not a good bonsai to start from, especially if you live in Reggio Calabria. The azaleas belong to the rhododendron genus, and are native to most of the globe, even in Italy there are some endemic species; the Italian species are widespread in the Alps and the Apennines, while the areas of Asian origin are Tibet, and the highlands near the Himalayan mountain range; they are therefore plants used to living in a cool and humid climate, very different from the one present in your city. If you read any cultivation manual of azalea bonsai you will be advised to place your pot in a place where you can enjoy a few hours of direct sunlight, well exposed to air and light, with good humidity. Honestly a combination of this kind, in Reggio Calabria, I think it is difficult to obtain, because the sun is scorching, from May until September, and the air is brackish, given the proximity of the sea. The result is a dehydrated plant; if to compensate for the lack of humidity, you go to water it very often, the soaked soil will favor the birth of mushrooms in the growing medium, with great ease. Azaleas are acidophilic plants, and as such they do not like water rich in limestone, and need a special soil; in the case of bonsai azaleas a specific soil is used for acidophilic plants, called Kanuma, not easy to find anywhere in Italy. Therefore, the problems that make the leaves yellow can be multiple: too dry air, excess of direct sunlight, brackish air, calcareous water. The problem of water is solved quite easily, in addition to supplying the correct soil, it is good to prepare a watering can filled with water, including the tap, and let it rest for at least a couple of days, before using it to water, so that the limestone deposits; being a single bonsai, a full watering can lasts for days. As for the heat and the sun, keep your plant in a semi-shaded area from May to September, away from direct sunlight, but very bright. Avoid exposing it to strong winds, if it comes from the sea; and it frequently vaporizes the leaves, with the water of the waterings, to improve the environmental humidity, but do it in the early hours of the morning, not in the warm hours of the day, and not in the evening.