Here is one the old lady learned about from her homesteading buddies. There are a lot of veggies you can buy from your grocer, use, and then replenish. Here are some green onions we saved the root ends of that are regrowing. We've done the same with romaine lettuce and actually transplanted that into the garden eventually. It's stuff that you eat the tops of that this works with. So etching like carrots, where you eat the root, just go to tops.
Thats a good idea there. Ive heard of doing stuff like that with potatoes and such and am very interested in it and gardening in general but I always end up with to much on my plate or a serious case of laziness.
Yeah, potatoes and garlic and ginger you can divide and growing new plants. This stuff you just drop in water, that's about 4 days of growth on those.
I have done that with celery from the grocery store. The plant did very well until I put it outside and a critter got to it. Be careful though. Basic grocery stores will sell the variety of produce that keeps and transports the best. The storage varieties don't always have the most flavorful taste.