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The availability of information and the speed with which we can access it have changed radically in recent decades, and technological advances in all aspects of our lives are accelerating at a pace that is hard to comprehend. Nevertheless, it can be difficult to find relevant, accurate information in a digestible format, when it is needed. Our goal in this sixth revision of the Knott’s Handbook for Vegetable Growers is to provide up-to- date information on vegetable crop production in handy format for growers, as a textbook for students, and as a reference book for extension personnel, crop consultants, and all those concerned with commercial production, handling, and marketing of vegetables. New technical information has been included on the status of the vegetable industry, water management with drip irrigation and soil moisture sensors, fertigation scheduling, petiole sap testing, plant tissue testing, fertilizer recommendations from several regions in the United States, worker protection and food safety standards, post-harvest and handling topics, new computer-based technologies to improve farm efficiencies, and protected agriculture production systems. We have added and updated many references that provide additional information on vegetable production.