Cut a 1-inch slice off the top of the carrot. Use care not to damage the young shoots, as these will continue to grow into a frilly, fern-like plant.
Fill the bottom of a shallow pot or saucer with pebbles or glass nuggets. These support the growing carrot plant and provide room for roots to grow.
Place the carrot top on top of the pebbles with the cut side facing downward and the tiny sprouts pointing upward.
Cover the pebbles with water so that the bottom of the cut carrot rests in the water. Do not cover the entire carrot slice with water, as this encourages rot.
Place the container on a sunny windowsill. New shoots will form within a few weeks and gradually grow to a height of 12 inches or more.
Check the container daily and refill the water to the original water level.