Green onions and celery are really simple. After you use them up, save the bottom part. Just stick them into some water and they will re-grow. I give them fresh water every few days. The celery can be planted outside once it gets a little bigger and has some roots. The green onions could, too, but you can also just keep them in your kitchen and keep re-growing them- giving you an endless supply of fresh green onions!
Here is my sweet potato plant. Stick a few toothpicks into the potato and put it into water. It will start sprouting roots. Mine is just in the beginning stages, but it will get some big vine-like sprouts growing off the top. These are called "slips". Once these sprouts are 5-6 inches long, remove them from the potato and put them in another jar of water. These will take root and can be planted in a pot or in the garden to grow into potatoes.
I am also growing some regular potatoes, herbs, and lots of veggies. They are started inside and waiting to sprout-soon to be planted in my garden. I love this time of year when we get to start growing so many beautiful things- to be eaten fresh from the garden.
Update: I tried planting Romaine lettuce from the cut off ends and it is growing, too- how cool is that?
Have you ever sprouted your own alfalfa sprouts or mung beans? It's really easy! See my post about it here.
What are you growing??