It is often difficult to identify a specific lettuce variety from a handful of mixed seed. But anyone can differentiate pumpkin seeds from lettuce seeds. With time and experience, gardeners learn to spot the subtle characteristics of specific varieties to help them identify the seeds purely by sight.

Have students create a visual library of all the seeds used in the Lab, complete with physical descriptions and photo. Have them create classification standards based on the physical attributes of the seeds. Cross reference this information with the data from the seed packets.