Perfect for high-attaining Year 7 students, this engaging garden-themed maths investigation develops confidence with decimals, area, subtraction, addition, multiplication, budgeting, problem solving, reasoning, optimisation, estimation, financial mathematics, percentage thinking, decision-making, justification, mathematical communication, constraints, and real-life applications. Students take on the role of garden designers, calculating available space, subtracting occupied areas, managing a £150 budget, comparing costs, and making strategic decisions to create the best possible sensory garden. The lesson encourages independent thinking and deeper mathematical discussion while providing meaningful contexts for decimal calculations. Beautifully presented resources include a professionally designed “Shoddies Garden Centre” price list, student investigation worksheet, spending record sheet, PowerPoint presentation, and custom garden-themed slide backgrounds. With a balance of structure and open-ended challenge, this lesson promotes resilience, creativity, and mathematical reasoning while meeting key KS3 objectives. Ideal for Year 7, enrichment lessons, observation lessons, or developing problem-solving skills through an engaging cross-curricular gardening context. Can easily be used for any years to work on their decimals calculations and reasoning.