Try a Tasting Garden of inexpensive, fast growing seed
crops such as mixed salad greens, radishes and herbs such as lemon
thyme, culinary sage, cilantro, parsley, and pineapple mint (in a
pot submerse in the soil so it doesn't take over the garden!)
Remember to label the plants so people know what they are.
Signs are helpful: "Still Growing...Not Ready for Eating" and
"Ready to Pick and Eat!