What cork cambium and solar flares have in common
Dicotyledonous plants growth up (via primary growth) and out (via secondary growth). Increases in circumference cause splitting of the bark which stimulates the cork cambium to fill the gaps. I wonder what the surface of a birch would look like if you could film it in time-lapse. I imagine that the surface might appear to mix and churn and roil up. It would look similar to the apparent mixing and churning which takes place on the surface of the sun as the star’s rotation causes lines of magnetism to merge, creating explosions which surge from the surface. While solar flares dance for minutes or hours, the dynamics of the surface of a birch occur over a time horizon 100s, 1000s, or even 10,000 times longer.