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Plant that grows with a characteristic called "apical dominance." This means it will do everything to push a single tip towards the source of light. We call the tip ''apical tip or the terminal tip''. This tips is also the biggest colas due to their proximity to the source of light. The tip of the plant is also where a particular type of auxin (plant hormone) is most prevalent. It's called indole-3-acetic-acid (IAA). This auxins promote growth only to the apical tip as far as it can to the source of light. The lower branch will remain auxiliary buds and branching is not as likely to occur in these places. This is because the auxin production within the apical tip is too far, preventing the lower buds from growing out. |