My mom always had little bowls on the windowsill with celery hearts, sweet potato vines, an avocado pit held in water with 3 toothpicks….. anything that would sprout. I do it, too. It's so nice to reach over when cooking & have a few fresh, tender little celery stalks to add to soup or whatever.

I have done it with lettuce, romaine, It will start to grow up and out of the center.

Green onions work really well, too. You an have onion greens at your fingertips year round in your little aquaponic garden cup.

I have never done it, saw it and shared it unknowingly did not share the source, I have done it with green onions with success. So if I see something
else I will state the source, do not want to be unliked here, I love this site.