For your Garden party theme, here is a game idea that can be altered to fit the Garden party theme.
Check out Garden
Party Games for more free party games. A Garden party takes place outdoors in the Spring or Summer months for a fancy lunch displaying beautiful plants and flowers.
GARDEN PARTY GUESS IT? GAME: Have all of your garden foods labeled well, i.e. basil, tomatoes, sunflowers, etc. Serve as much food as possible that uses items directly from your garden. Give each person an index card for each food item, and ask them to guess what garden delicacies (if any at all) were used. The person who guesses the most, wins a prize - perhaps a gazing ball.