A while ago I read that many produce items can regenerate. One vegetable they recommended was the scallion. They said to put the root ends in water and the plant will regenerate. I tried this a few times and hit did grow but always eventually rotted like after a week. I find that basically doing nothing and letting the ends stay in the refrigerator produces results in about two weeks time and haven’t rotted yet.
You will get even better and faster results if you just plant them.
You can get mini romaine heads off of your romaine ends with just water.
It takes about a week to grow a mini head…..But then you have to use it or it will rot.
Before you toss out scallion or romaine ends consider produce regeneration.