In the spring and buy a package of 200 onion bulbs for a $1.99 and plant them in my garden because I love having green onions. They require very little care to grow, just occasional water if there us a dry spell, and then you just pull them up when you want them. These cost pennies a piece compared to the 10 for a $1 pay for at the store.
Here is the free part: Chop off the ends (roots plus 1/2 an inch to 3/4 of an inch) and replant them right back out I the garden.
Just use your thumb to make a one inch hole, insert the onion roots down, cover with dirt, water, and walk away.
In a few weeks time you'll have another set of green onions!
*Note: Green onions are very hardy. If you don't have a garden bed you can also grow them in a container on your deck backyard as long as they plenty of sunlight.
Do you know any other good garden tricks?