I don't know when to water the flowers. The flowerpot will tell you. At the flower show, a flowerpot with a scale table already has this function. When the "red line" on the scale points to "MIN", it means that the flowers are in urgent need of watering, and when it points to "MAX", it means that there is enough water and no need to water. It is understood that this scale adopts the floating ball principle, which has been patented in China, and the price of each flowerpot is 200-300 yuan.
If you think this flowerpot is too expensive, there are cheap ways. A kind of red "earth" called Serramia is made from the red clay of the German Rhine. It seems that each particle is similar to a pebble, but its water content is as high as 100% or even higher than its own volume. Its good air permeability makes it not harden and carbonize like ordinary soil, and it can serve plant roots for a long time, and it doesn't matter if you don't change pots for several years. At the same time, flower growers can also judge whether they should be watered from the color depth of flowers.
Are there any flowers that don't need watering and fertilization at all? A gardening supplies company in Shanghai introduced a "plant baby" with a minimum height of 1 cm. It is sealed in a test tube filled with nutrient solution, and what flower growers need to do is to let it receive a certain amount of light every day. And a plant research institute in Shandong Province brought a kind of Dictyophora native to South America, which is even more unique. Not only do you not need to water, but you don't even need a flowerpot. As long as you put plants in the air, you can survive.