Pine cones can be used to predict the weather. If rain is coming, they will close. Maple leaves curl upwards when rain is coming. This is a response to humidity and strong winds.
Also, plants, such as dandelion and clover, can accurately forecast rain by folding before a storm. Another plant that responds to impending rain by closing tightly is the Scarlet Pimpernel.
Do you know other plant trivia? Post in the comments.
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