Plant Growing Orientation – How Do Plants Know Which Way Is Up

When you start seeds or plant bulbs, do you ever wonder how plants know which way to grow? It’s something we take for granted most of the time, but when you think about it, you have to wonder. The seed or bulb is buried in dark soil and, yet, it somehow knows to send roots down and stems up. Science can explain how they do it. Orientation of Plant Growth The question of plant growing orientation is one scientists and gardeners have been asking for at least a few hundred years. In the 1800’s, researchers hypothesized that the stems and leaves grew up toward light and the roots down toward water. To test the idea, they put a light under a plant and covered the top of the soil with water. The plants reoriented and still grew roots down toward the light and stems up toward the water. Once seedlings […]

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