This book is very important for those wishing to produce potato more than once in a year and also want to use plant growth regulators to boost agricultural productivity. The use of plant growth regulators is environmentally friendly and available everywhere on the world. Thus, the book describes the merits of plant growth regulators for horticultural crops production in general and potato in particular. While preparing this book, I have given adequate consideration to present the most advanced information on all topics. In a constantly evolving field, this is always not easy; however, the contents are intended for students in the area of horticulture and potato producers on the world as well as scientists and other professionals interested in plant growth regulators. I believe that the contents will enrich the knowledge and provide a fresh angle to several issues in potato research and development. The author wishes to thank the whole-hearted support, encouragement, and professionalism shown by the publishing team at Lambert Academic Publishing during the preparation of the book and bringing it into a successful production.