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  • How do plants know when it’s spring?

    When we see little green plants sprouting up from the soil, it is indeed a sign that spring has arrived. To find out how they know to grow, or germinate, I asked my friend Camille Steber.

    In her U.S. Department of Agriculture lab at Washington State University, she studies the source of almost all plants: seeds.

    A seed holds pretty much all the information a plant needs to know how to grow. The shell that holds all the seed parts inside even contains food for the plant. But the seed is very dry and needs to sense clues from outside to know when to germinate at the right time.

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