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This study focused on the pedagogical application of priming in an EFL context. Structural priming refers to the speakers’ tendency to produce the structure they encountered in recent discourse in subsequent production compared to an alternative form. Given the limited number of studies in the literature with a focus on the application of priming in L2 teaching and the problems that L2 learners face during speech production, the present study aimed at investigating whether the implication of priming leads to a more frequent oral and written production of the relative clause (RC) structure compared to adjectival modification of nouns (AN) in long- and short-terms as an instance of implicit learning. Participants consisted of 60 EFL female L2 learners, aged between 18-25 years old. Two experimental and 1 control groups were defined and 20 participants were allocated to each group. By applying a pretest, a treatment, an immediate posttest, a delayed posttest design, a picture description task, and a grammaticality judgment test (GJT), the data were gathered. Results of the descriptive and inferential analyses revealed that the implication of priming led to an improvement in the rate of the RC construction when the participants were involved in the written production of the L2, as compared to oral modality. Results are discussed based on structural complexity and procedures involved in L2 production. Theoretical and practical implications of the study are considered, too.