The National Council of Teachers of Mathematics (NCTM), along with several other national organizations, released a joint statement indicating how crucial incorporating data analysis into lessons is (NCTM et al., 2024). Mathematics and gardening may seem like incongruent ideas, but mathematics, specifically data analysis, infiltrates activities related to gardening. The following garden-based, interdisciplinary STEAM lesson challenges students to consider the costs of planting, watering, and growing a garden. Students use mathematical thinking to determine if gardening is worth the cost and reward. Using a 3-H model, this lesson connects students emotionally using mathematical thinking and evidence-based argumentation to weigh the costs and rewards. This lesson was implemented in the first author's 9th-grade, 75-minute, Secondary Mathematics I class to introduce models of linear equations.