Lauren at Path Across decided to grow some green onions instead of throwing them away. The results–and how she did it–are here.
An interesting quote:
Look, you’re not going to save a whole lot of money. But you will get a kick out of growing food scraps that you would normally throw out.
Depending on your situation, it’s true that gardening may not save you much money. As we’ve noted, most of the time by the time your own vegetables are ready to pick the prices have also come down at the grocery store. So unless you’re growing with the intent to store most of it for later the only real impetus is to have fresh produce that you know where it came from (and that’s no insignificant reason! Homegrown usually tastes much better than the stuff you get from the store!).
But let’s not downplay the “kick” you get out of growing your own, especially from food scraps. There’s also the satisfaction that comes from knowing how to grow produce if needed. It may be cheaper to buy from the store now, but some day that may not hold true. It’s best to be prepared.