Flowers and plants can predict the weather

“People don’t know spring, birds know spring, birds don’t know spring, grass knows spring.” People have discovered that in the plant kingdom, some members can actually predict the weather like a weather station. A wonderful flower grows in Xishuangbanna, China. When a storm comes, a lot of flowers will bloom. According to this characteristic, people can know the weather changes in advance, so we call it "Yuhua". Raindrop, also known as red jade curtain, calamus and leek, is an herbaceous flower of the Allium genus of the Amaryllidaceae family. Its leaves are flat and linear, much like the long leaves of leeks, curved and drooping. The bulb is round and slightly thicker than garlic. Blooms in spring, the flowers are pink or rose red. Rain flower stones are native to Mexico and Cuba. It prefers to grow in fertile, well-drained, slightly clayey soil and is not cold tolerant. So, why can Yuhua predict wind and rain? It turns out that before the storm comes, the outside atmospheric pressure decreases, the weather is sultry, and the plant's transpiration increases, causing the bulbs that store the nutrients of the rain flower stone to produce a large amount of hormones that promote flowering, prompting it to bloom many flowers. Flowers tell the rain, and vegetation tells the weather. Zoysia and thatch, perennial grasses, can also predict the weather. When moldy hairs appear at the junction of the leaves and stems of zoysia grass, or foam appears at the junction of the leaves and stems of thatch, it indicates that rain is coming. Hence the saying "When Zoysia grows mold, it will rain"; the proverb "If the petioles of thatch vomit, it will rain tomorrow". Interestingly, grass not only predicts the weather but also measures temperature. There is a "temperature grass" in southern Sweden that can measure temperature like a thermometer. This grass has rectangular leaves and blue, yellow and white flowers, so it is also called "pansy". Its blades are extremely sensitive to temperature. When the temperature is above 20°C, the blades extend obliquely upward; if the temperature drops to 15°C, the blades slowly move downward until they are parallel to the ground; when the temperature drops to 10°C, the blades extend obliquely downward. If the temperature rises, the blade will return to its original shape. Local residents can tell the temperature based on the orientation of the leaves.