Flowers and plants can predict the weather.

People don't know spring birds know spring, and birds don't know spring grass know spring. It has been found that in the plant kingdom, some members can forecast the weather like meteorological stations.

There is a wonderful flower growing in Xishuangbanna, China. When the storm comes, a large number of flowers will bloom. According to this feature, people can know the weather changes in advance, so it is called rain flower. Rain flower, also known as red rain curtain, calamus lotus and leek, is an herb flower of Allium in Amaryllidaceae. Its leaves are flat and linear, much like the long leaves of leeks, hanging in an arc. Bulbs are round and slightly thicker than onions. Flowers bloom in spring and summer, and the flowers are pink or rose red. Yuhua is native to Mexico and Cuba, and likes to grow on fertile, well-drained and slightly sticky soil, and is not cold-resistant.

So, why can Yuhua forecast the wind and rain? It turns out that before the storm, the external atmospheric pressure decreased, the weather was sultry, and the transpiration of plants increased, which made the bulbs of yuhua trees store nutrients produce a large number of hormones to promote flowering, prompting them to bloom a large number of flowers.

Flowers know sunny and rainy days, and vegetation reports the weather. Perennial herbs Zoysia japonica and thatch can also predict the weather. When moldy hairs appear at the junction of the leaves and stems of Zoysia japonica, or when the leaves and stems of thatch begin to bubble, it indicates that it will rain. So it rains when Zoysia japonica grows mildew; The proverb that the thatched petiole spits, and it will rain and work tomorrow.

Interestingly, grass can not only predict weather, but also measure temperature. There is a kind of temperature grass in southern Sweden, which can measure temperature like a thermometer. This kind of grass has rectangular leaves and blue, yellow and white flowers, so it is also called pansy. Its leaves are extremely sensitive to temperature. When the temperature is above 20℃, the leaves extend obliquely upward. If the temperature drops to 15℃, the blade will move down slowly until it is parallel to the ground. When the temperature drops to 10℃, the blades extend obliquely downward. If the temperature rises, the blades will return to their original state. Local residents can know the temperature according to the extension direction of its leaves.