Potassium (K) is one of the three essential nutrients for plants. It plays a critical role in a wide range of processes, including cell growth, photosynthesis and regulation of water balance. Plants take up K from the soil and circulate it throughout their bodies via molecules called K+ channels.

Source: [Phys.org](https://phys.org/news/2026-09-green-thumb-molecule-leaf-stalks.html)

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