Growing a windowsill garden from kitchen scraps is a frugal and delicious science experiment for children. With a few recycled containers, potting soil and a selection of scraps and seeds, your children can experience first hand the joy of gardening -- no matter where you live. As long as you have light, soil and water, your scraps will grow. One interesting vegetable to resprout is the celery, with its layers of stalks and leafy top.
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Cut off the base of the celery, 1 1/2 inches above the root. Set the base aside, root side down, in 1/2 inch of water.
Punch a few holes in the bottom of a large cottage-cheese container. Set the container inside a second intact container. Fill with potting soil and add water, allowing it to soak into the soil.
Take the celery base out of the water and settle it gently into the moist potting soil. Mound a little soil around the sides of the celery; do not cover the top.
Place in bright filtered light. Keep the soil moist but not soaking wet. The celery base will sprout new roots and leaves in a week or two. Once the celery is actively growing, transplant to a flower pot or into the garden.