How do trees know when to let go of their leaves and when to regrow them?

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How do trees know when to let go of their leaves and when to regrow them?

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Anonymous 0 Comments

Temperature and daylight hours, mostly. Plants have hormones, and the hormone balance changes with changing environmental conditions, making the trees transition to the next phase.

Fun fact: many fruit trees in temperate climates need a certain number of chill hours, which is time spent above freezing but below +8°C, or they won’t flower and set fruits properly the next year.