You can grow specific carrot varieties in flower boxes. Just look for carrots that are round or dwarf varieties. They are found at most stores and can be found easily on-line. I grow onions in seed trays in seed flats. You will be amazed at how the grow. Here are two great ways to have a container garden.
Check out my vegetable gardening blog: The Rusted Garden. It is filled with garden information, videos, pictures, seed catalogs and seeds & things I sell. www.therustedgarden.blogspot.com
Join My Google+ Gardening Community called Our Tomato & Vegetable Gardens – we are approaching 5000 world-wide gardeners:
or Link from My YouTube Page.