You've inspired me! This time of the year, I'm suffering garden and fresh veggie withdrawal! I love scallions. How much of the root base of a sweet onion would be required to get decent top growth? I'm guessing that sweet onions would produce a sweeter top? IMO, better to have green stuff growing on the window sill that you can eat, or otherwise use, instead of just for looks. I have half a dozen citronella in various stages of growth. It'd be nice to have some onion tops, dill, parsley and basil to round out the sill garden.