The marijuana plant, or "ganja" as it is often called has long played a significant role in the reggae and Rastafarian cultures which originate in the Caribbean island of Jamaica. This natural herb has numerous health benefits and other uses which are examined in the book "Grow Jamaica" by Reverend Leeroy Campbell who presents a multifaceted argument for its legalization. This book inspired the production of a Grow Jamaica movie, a thought-provoking hour-long documentary which explores the implications of legalizing the herb through the eyes of various Jamaicans.

The dedicated Reverend Campbell had spend many years researching the marijuana plant and studying the effects it has before his death in 2009. His book discusses many aspects of hemp and cannabis, from its history and uses, to how it eventually became outlawed. The main reason for his belief that it should be legalized, is to help increase the country's GDP and improve their economy.

The film brings to life the ideas examined in the book. The viewpoints of Jamaicans from different walks of life such as doctors, police officers, politicians, and economists are presented in favor of Reverend Campbell's argument for the legalization of ganja. Campbell himself appears in the film to discuss his beliefs, which give the audience a clear idea of his credibility and exactly what an educated, talented, and accomplished man he was.

Other guests who speak up on the topic include such locally recognized figures as actor and broadcaster Oliver Samuels, musician Stephen Marley, and Dr. Bragga. These men each have an enlightening and interesting perspective on the implications of legalizing ganja, which is presented factually, yet humorously.

The fact that Campbell had worked as a counselor and teacher gives him the ability to truly influence, reach, and motivate his audience. Evidence he uses to back his position are based on fact, rather than just opinions as he has performed numerous studies on the herb. He explains how there is much potential in marijuana as a valuable crop, since it is used in many industries such as tourism and food.

Hemp is a variety of marijuana with a low THC (tetrahydrocannabinol) content, which is the psychoactive chemical present in cannabis. This plant itself is very useful, its strong fibers can be made into construction materials and environmentally-friendly biofuel alternatives. It can produce a material similar to cotton, and is also used to manufacture paper, saving trees. This crop grows quickly without the need for excessive pesticide use or watering.

The nutritional values of hemp are many as well. Its oil and seeds are a great source of essential fatty acids which are necessary for many bodily functions. They have been proven to lower blood pressure and reduce cholesterol. Unfortunately, even hemp is lumped in with the other types of ganja, making it illegal to grow and sell too.

The Grow Jamaica movie was selected and screened at the BFI and Flash Point Film Festivals, and since then has become a topic of discussion by many critics and viewers for its poignant approach to this touch subject. Perhaps one day, if society will take into consideration the points it raises, Campbell's vision will be realized.