my bing cherry tree needs 700 chilling hours, what's that?

On the tag for my bing cherry tree it stated that the tree needed 700 chilling hours can you please explain what they mean

Answer #1

When the temperature is between 45 and 33 degrees, certain chemicals are produced in most trees. The longer the tree spends between these temperatures, the more of these chemicals are produced. Only when the chemicals reach the right level is the tree ready to respond to the warm air. So the cherry tree needs 700 hours in between that temperature range before it is prime enough for warmer temeratures.

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