How much does cultivar really impact the way a coffee roasts and tastes? For years, terroir and processing have dominated the conversation, while cultivar remained an afterthought. Cultivar: A Practical Guide for Coffee Roasters challenges that narrative, offering a detailed exploration of how genetic differences shape coffee’s flavor and roast behavior. To answer this question, I dedicated 606 days to rigorous experimentation—conducting 309 roasts across 31 coffees from 6 farms in 4 different coffee-producing countries. Backed by 16 years of roasting experience and 12 years as a coffee consultant, this book is the culmination of my hands-on research, cupping sessions, and analysis. Cultivar is a practical resource for coffee roasters looking to refine their approach, understand the unique roasting needs of different varieties, and take their craft to the next level.