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> So it's basically a pipe growing on its merry way then slams on the brake and by some means grows a disk 90° to the direction it was growing before it stopped

It’s always growing up, even as it creates a node. The way it works is the hormones shoot down the stem from the tippy top (where the growth is happening) and tell a lower part of the plant to create a node there (even as the top continues to grow up)




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