I'm going to leave the flowers out even though there are some edible flowers. Whenever I have seen them in the store they are expensive. If you want to try it, by all means go ahead!
Image by Brambleberriesintherain.com
Obtain a variety of plants in the above categories. Here are some suggestions:
Seeds - sunflower seeds, almonds, pistachios.
Stalks - celery, rhubarb, asparagus.
Fruits - blackberry, mango, kiwi.
Prepare the plants as necessary (rinsing, chopping, etc.), each one on its own plate. One at a time, introduce the plant. Pass the plate around and allow each child to take a piece, taste it, and discuss what they taste. Proceed with all the plants.
As a group, with you as facilitator, arrange the plants in order from which tasted best to which tasted worst. Is there general consensus within the group of children or not? Which do they like best: seeds, stalks, or fruits? Which do they not like at all?