Adjust the light and control the humidity

Orchid is a kind of plant that likes half shade and half sun. However, different orchid species have different requirements for light. Ink orchid requires the most shade, strong light or too long light will make the orchid leaves soft and drooping; Chunlan and cold orchid like shade, cold orchid like refracted light; cymbidium and Jianlan need more sunlight, but they can't be placed in the scorching sun. The intensity and length of light have direct effects on the germination number, unearthed period and growth status of orchid leaf buds and flower buds. When the light is moderate, the orchid grows luxuriantly, and the light is too strong or too weak, the orchid does not grow well. The orchids placed in the shade germinate more leaf buds and fewer flower buds, on the contrary, they produce more flower buds. But the sunshine in spring is beneficial to the growth of Cymbidium and Cold Orchid. Let the sun scatter or tilt for two hours a day in spring. The shade degree of orchid planting site is generally controlled at 60% Mel 70% in spring and 70% Mel 80% in summer. There is no need for shade after White Dew, so it can be exposed to more sunlight, promote photosynthesis and accumulate nutrients, which is conducive to growth in the coming year. Some orchids that prefer shade or sun can also be adjusted by placing them in different shade and sunny places of orchid planting sites.

Drought tolerance is one of the habits of orchids. The dry humidity requirements of orchids should be divided into two aspects, one is air humidity, the other is basin humidity. The leaves of orchids are clustered, and the area of transpiration is larger, which requires higher air humidity. The roots, leaves and pseudobulbs of orchids have a unique structure, which can store water, so orchids can tolerate drought. The dry humidity of orchid pot soil should be "moderate dry and wet, dry in wet". Wet and dry, which is conducive to air permeability and sprouting. The basin soil is too wet, which leads to rotten roots and diseases. Specifically, the orchid potted soil in spring, summer and autumn should be kept seven per cent dry and three per cent wet, and eight per cent dry and two per cent wet in winter. Orchid leaf bud growth period (about May to the end of June) needs more water, in case of continuous sunny days, should be properly watered in order to strengthen the seedlings. Leaf bud emergence period (about March-April) should be properly less watering, otherwise it is easy to cause the bud base to blacken and rot. During the winter dormancy period, there should be less watering or no watering. When the basin soil is too wet, a small amount of plant ash can be sprinkled on the basin surface to adjust the basin soil humidity.