Flowers and plants can forecast the weather

"People don't know spring birds know spring, and birds don't know spring grass knows spring." It has been found that in the plant kingdom, some members can actually predict 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 we call it "Rain Flower". Rain Hualien, also known as Ruby Curtain, Acorus calamus and Leek, is a herbaceous flower of Allium in Amaryllidaceae. Its leaves are flat and linear, much like the long leaves of leeks, bent and drooping. Bulbs are round and slightly thicker than garlic. In bloom in spring, flowers are pink or rose red. Rain flower stones are native to Mexico and Cuba. It likes to grow in fertile, well-drained and slightly sticky soil and is not cold-resistant. So, why can Yuhua forecast the wind and rain? It turned out that before the storm came, the air pressure outside was reduced, the weather was sultry, and the transpiration of plants was enhanced, which made the bulbs that stored the nutrients of yuhuashi produce a large number of hormones to promote flowering, prompting them to bloom many flowers. Flowers know the rain, and vegetation reports the weather. Zoysia and thatch, perennial herbs, can also predict the weather. When moldy hairs appear at the junction of leaves and stems of Zoysia japonica, or foam appears at the junction of leaves and stems of thatch, it indicates that it is going to rain. Therefore, there is "it rains when Zoysia grows mildew"; The proverb "straw spits, it will rain tomorrow". Interestingly, grass can not only predict weather, but also measure temperature. There is a "temperature grass" in southern Sweden, which can measure the temperature like a thermometer. This 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 moves 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 blade will return to its original state. Local residents can know the temperature according to the direction of leaves.