Research about the achievement of 21st-century students' plant literacy by field trip implementation has carried out to improve students' plant literacy. This study used a quasi-experimental method. This design includes a group of students observed in the pretest phase which is then followed by treatment with field trip implementation and ends with a posttest. The Field trip includes determining the aspects to be observed, carrying out observations, collecting data, discussion of results and reporting. Research instruments include a set of plant literacy questions and its rubric, worksheet for field trip students and its rubric, and a questionnaire about student response to the implementation of the field trip. There was a slight increase (N-gain 0.16) of students' plant literacy in the experimental class and the control class (N-gain 0.23). The result shows that the 21st-century students' plant literacy has the potential to develop through field trip implementation.