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Scallions - In as little as 5 days you can completely regrow a full scallion (or green onion) from the scraps. Leave about an inch attached to the roots and place them in a small glass with a little water. In a few days, you’ll have all new scallions.

from WonderHowTo

How To: 10 Vegetables & Herbs You Can Eat Once & Regrow Forever

10 Vegetables & Herbs You Can Eat Once and Regrow Forever « Food Hacks | "In as little as 5 days you can completely regrow a full scallion (or green onion) from the scraps. Leave about an inch attached to the roots and place them in a small glass with a little water. In a few days, you'll have all new scallions."

Regrow Mushrooms - Plant mushroom stalks in soil with some compost or used coffee grounds and keep them in a moist environment, preferably where it will be cool at night. They can be tricky to grow, and within a few days the stems will either start to sprout new heads or rot.

Basil - Put a few basil clippings with 4-inch stems in a glass of water and place it in a spot with direct sunlight. When the roots are about 2 inches long, you can plant them in pots to grow a full basil plant.

Regrow Cilantro - Like basil, cilantro can grow roots if the stems are placed in a glass of water. Once the roots are long enough, just plant them in a pot. In a few weeks new sprigs will be starting, and in a few months you’ll have a full plant.

Romaine Lettuce - If you have a stem from a head of romaine lettuce that’s still intact, place the stump in a bowl with about ½ inch of water and put it on a windowsill. You’ll start to see new leaves in about 2 weeks, and they’ll be full grown in 3 to 4.

Bok Choy - Just like romaine lettuce, bok choy can be regrown by placing the root end in water in a well-lit area. In a week or two, you can transplant it to a pot with soil and grow a full new head.

Regrow Ginger - Like onions, ginger root can be planted in soil to regrow, but the process is a lot more lengthy. It can take a few months for it to sprout, and you should be able to harvest a fully grown bulb in 8 to 10 months.

Onions - Plant the discarded root end from an onion in a pot or directly in the soil outside to regrow. You can harvest it early and get fresh green onions or wait until the bulb is fully developed.

Hydroponic Vegetables: Don't throw away your scraps. Regrow your veggies. It really works! Cut the bulb off a green onion and the bottom of a celery. Place in a little water (I use distilled), and place in a sunny window. Soon you will see roots and shoots grow from the green onion and celery stalk in the center of your celery bottom.