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Rhododendron is Mother Nature’s winter thermometer

Rhododendron leaves curl in response to cold weather. It was 20 degrees when this photo was taken. (Photo by Mark Nale)

Rhododendron leaves hang curled and seemingly lifeless on a frigid winter morning.
As temperatures rise into the 20s, rhododendron’s leathery, evergreen leaves uncurl slowly to greet the morning sun. When temperatures reach the 30s, its leaves look almost summer-like. This curling-uncurling characteristic makes the rhododendron Mother Nature’s winter thermometer.

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