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Why do you want to increase the humidity of the air when you raise flowers on the balcony?
In the hot season, the high humidity of the air reduces the temperature accordingly, which is good for the growth of flowers. Some flowers that love shade and dampness can only survive in high air humidity. Such as orchids, monsteras, ferns and begonias require relative humidity between 80% and 85% in summer, and can not be less than 65% 75% in winter, evergreen ornamental flowers such as hibiscus, white orchid, five-color plum, jasmine, poinsettia and other relative humidity requirements in summer is not less than 70%, not less than 60% in winter, even if it is a drought-loving cactus or fleshy pulpy flowers, in the summer and autumn growing season, the relative humidity must be above 60% to grow well. 
The balcony is in the high place of the building, the light is strong in the hot season, the wind is dry and dry, the air humidity is in a low state for a long time, the flower plants will appear dull and dull, no life, and even the new shoots are dry and sharp, and the leaves have scorched edges and scorched spots, which seriously affects the growth and development of flowers and flowering and hanging fruits, so the balcony should increase the air humidity for raising flowers. 
How to increase the humidity of balcony air?The most direct way to increase air humidity is to spray water on the foliage or in the environment, which also lowers the balcony temperature and allows potted flowers to thrive. Foliar spraying can also rinse leaves, which is conducive to photosynthesis and promotes the growth and development of potted plants. 
Plants suitable for foliar spraying are: pine, cypress, rubber tree, palm, palm bamboo, rhododendron, camellia, bamboo, pearl orchid, orchid, evergreen, Guangdong evergreen, calla lily, monstera, fern and a variety of flowers and trees native to the tropical, **zone, warm temperate zone and flowers and flowers in the lower layer of the forest or in the canyon. 
However, pomegranate, crape myrtle, elm, maple, peach, plum and other deciduous flowers and trees, if sprayed with leaf water frequently, the plant will grow, which will damage the appearance, and the flowering will also be greatly reduced. Cacti and other pulpy flowers can only be sprayed foliage in the hot midday. Foliar spraying should be carried out by spraying the method, spraying wet, the number of times can be many times, each time if the spray is too wet and there is dripping, it will increase the moisture of the potting soil, resulting in water is difficult to dry and rotten roots. 
Balcony environment sprinkling, with the increase of temperature can be carried out many times, but in the morning or in the afternoon balcony ground cool after the water can be sprinkled, such as at noon or the balcony ground heat is not cool to sprinkle water, then the heat evaporates, will make the pot affected by the heat and growth, in the balcony ground shade like shade and damp potted flowers, will be fumigated by the heat and suffocated immediately.
It is best to lay a thick 1 on the balcony floor and on the trellis5 2 cm straw mat, due to the large water absorption, with the help of temperature, can produce a large amount of water vapor, plus there is a shade on the trellis, the water vapor emission is also slow, can make the balcony and the microclimate on the trellises maintain a certain humidity, so than in the ground and the surrounding environment often sprinkle water is simple and easy, and safe.
Flowers wintering indoors, but also have a certain air humidity, and the family flowers are mostly people and flowers live together, for the potted flowers that like moisture, you can use the plastic film method or put a pot of warm water 20 higher than room temperature in the hood at the same time, so as to increase the air humidity of the small environment. In homes with heating equipment, a damp cloth can also be spread on the radiator to heat it to produce water vapor, which can also create a locally humid environment.