The following website has some awesome resources and links for school gardens across the country. In particular, it has a link for a fun and easy activity to do with your students.
The Garden Patterns Activity has students work with patterns. The worksheet features a series of vegetables. Students have to finish the pattern by drawing, naming or pasting the rest of the vegetables in the sequence.
Rather than reinventing the wheel, check out this awesome resource and easy activity to do with your students!