List at least four vegetables that were found in Mr. Fitzgibbon's garden.

In the first chapter of Mrs. Frisby and the Rats of NIMH, we learn that the portion of Mr. Fitzgibbon's vegetable patch in which Mrs. Frisby makes her winter home contains beans, potatoes, black-eyed peas, and asparagus. We can also infer that parsnips and carrots are grown close to this portion of the garden, since Mrs. Frisby looks around the fence in search of these items to feed her four children. She has no luck finding green vegetables in the late winter but instead finds a stockpile of corn, nuts, and mushrooms. We're told that the cornfield is located in a far-off part of the farm, and since Mrs. Frisby looks hopefully around the fields for lettuce, we can conclude that Mr. Fitzgibbon grows that in his garden as well.