You can regrow scallions by leaving an inch attached to the roots and place them in a small glass with a little water in a well-lit room.
When garlic begins to sprout, you can put them in a glass with a little water and grow garlic sprouts. The sprouts have a mild flavor than garlic and can be added to salads, pasta and other dishes.
Bok choy can be regrown by placing the root end in water in a well-lit area. In 1-2 weeks , you can transplant it to a pot with soil and grow a full new head.
Put carrot tops in a dish with a little water. Set the dish in a well-lit room or a window sill. You’ll have carrot tops to use in salads.
Put clippings from basil with 3 to 4-inch stems in a glass of water and place it in direct sunlight. When the roots are about 2 inches long, plant them in pots to and in time it will grow a full basil plant.
Cut off the base of the celery and place it in a saucer or shallow bowl of warm water in the sun. Leaves will begin to thicken and grow in the middle of the base, then transfer the celery to soil.
Put romaine lettuce stumps in a 1/2 inch of water. Re-water to keep water level at 1/2 inch. After a few days, roots and new leaves will appear and you can transplant it into soil.
The stems of cilantro will grow when placed in a glass of water. Once the roots are long enough, plant them in a pot in a well-lit room. You will have a full plant in a few months.