Cut all but 2 inches off the carrot, leaving a 2-inch stub below the upper foliage.
Snip off the fern-like greenery above the carrot root if your carrot has any. Do not cut into the orange root. Leave about 1/2 inch of foliage at the top of the root.
Lay down 1 inch of sand or pebbles in a bowl. Use a bowl that has no drainage hole.
Force your cut carrot into the center of the sand or pebbles in your bowl. If the carrot is not stable, add a little more sand or pebbles.
Pour warm water into your bowl, covering the sand or pebbles.
Place your potted carrot top in a sunny spot. More foliage will soon begin to grow from the top of the root.