Unfortunately, a new taproot won’t grow from the top of old carrot soaked in water. As you have seen, the tops will grow more leaves, and thin white roots will also grow, providing nutrients for the plant. The plant, over time, may even form flowers. But sadly, no new taproot will form to harvest. People still enjoy growing carrot tops for fun as an experiment, or to provide fresh greenery for an indoor display.
Unfortunately, a new taproot won’t grow from the top of old carrot soaked in water. As you have seen, the tops will grow more leaves, and thin white roots will also grow, providing nutrients for the plant. The plant, over time, may even form flowers. But sadly, no new taproot will form to harvest. People still enjoy growing carrot tops for fun as an experiment, or to provide fresh greenery for an indoor display.