Reuse your scraps for a bounty that keeps on giving.
Before you get started, there are a few things to keep in mind.
Keeping your water fresh and keeping an eye out for any sliminess will also be key.

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Change the water every two days or so as you wait for your greens to reach their full potential.
Start with a base of romaine that is about 2 inches in length.
Place the base in a dish filled with an inch of water.

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Be sure to keep the water fresh, changing it every two days.
Start with an intact celery base of about 2-inches in length.
Use toothpicks to suspend the lower half of the base in a cup or bowl of water.
Replace the water every two to three days, watching out for any sliminess.
Scallions
Scallions can be grown in water or planted straight in the ground.
Position it on a windowsill where it will receive plenty of sunlight.
The stems can be snipped off as they grow.
Potatoes
Sprouting potatoesnot great for eating, perfect for regrowing.
Place three or four toothpicks a couple inches above the end of the potato with the most sprouts.
Place the glass on a sunny windowsill and keep it full of fresh water.
Herbs
Basil, rosemary, and sage are ideal herbs for regrowing in water.
Remove the lower leaves before placing the stem in a glass of clean water.
It might take a few weeks for the roots to appear.
In the meantime, be sure to replace the water every two days.
When you might see roots, your herb is ready for potting.