Sell it as a school or classroom fund-raiser. The possibilities are enormous when it comes to creative arts. Make beautiful planting sticks, decorated elaborately with shells, yarns, feathers, etc. Use these to make planting holes, then give them a dual use as poles for runner beans. Make plant markers with common and Latin names, and make signs for north, south, east, and west.
Scarecrows are fun and creative.
Leaf rubbings, drawing and paintings are a natural series of activities that can evolve from looking closely at plants. In fact, as children begin to look closely as they are drawing plants, they will even discover more about them. Other activities include making solar blueprints, toad houses, root view boxes, solar dryers and rain gauges. Discuss what the songs say about us as a people. If you grow gourds, you may want to make drums and rattles from them.