My current intern, Katie Downing, brought the neatest idea to the classroom.
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Each student was given two beans, a cotton ball, a small plastic bag (I hole punch it for string the yarn) and a length of yarn.

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The cotton balls where soaked in water.

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The children put their two beans and the wet cotton ball into the little bag.

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The children then string the yarn through the hole in the plastic bag to make the necklace.
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The children wear the seed necklaces INSIDE their shirts so the seeds stay warm.  It is amazing — within 48 hours you can see the beginning sprouts!  Little baby seeds!