Horseradish, all the perennial herbs, and mint also belong in this permanent garden.
Particularly in an apartment-house neighborhood there should be a good sale for cut flowers. Energetic young salesmen could easily work up weekly orders. Marigolds, zinnias and other very easy-to-grow flowers should sell well. Early flowers like daffodils and tulips are always snapped up. So are the late ones, like chrysanthemums. Gladiolus is a favorite of flower arrangers, and can be grown in rows in the vegetable garden.
This is a wide-open field, and the selection may be almost anything that does well in your locality. Do, however, teach the young flower-vendors to condition their flowers before delivering them, so that customers' bouquets will not disappoint them by wilting prematurely. Chapter 8 explains this technique.
Materials for winter arrangements could also be made the backbone of a pocket-money garden. Any of the dryable materials covered in Chapter 8 are suitable. When fresh flowers begin to be scarce many people are glad to have these substitutes.
You may think of many more possibilities, perhaps better adapted to the children with whom you are working, and to your own neighborhood. Be selective, however, and keep the project pinned down to a reasonable number of items. Don't let the "big deal" dream become an ordeal in reality.