​Hortus Medicus, authored by George Graves with contributions from John Davie Morries, is a seminal work in the field of medical botany, first published in 1834. The book offers a comprehensive exploration of plants utilized in British medical practice during the 19th century, focusing on their medicinal properties, chemical compositions, and potential toxicities. Graves aimed to provide a practical guide for medical professionals, emphasizing plants that were either in current use or possessed poisonous qualities necessitating medical attention. The work is distinguished by its detailed botanical illustrations and thorough analyses, making it a valuable resource for both practitioners and scholars of the time.​

The publication is organized into sections that describe individual plants, detailing their botanical characteristics, medicinal applications, and chemical properties. Each entry includes information on the plant’s uses in treating various ailments, from inflammatory conditions to mental illnesses, reflecting the medical practices of the era. Graves also addresses the complexities of plant-based medicines, discussing issues such as dosage, preparation methods, and the challenges of standardizing treatments. This approach underscores the evolving understanding of pharmacology and the importance of empirical study in medical practice.​

One of the notable features of Hortus Medicus is its emphasis on the dual nature of plants as both therapeutic agents and potential poisons. Graves highlights the necessity for caution and expertise in the use of certain plants, acknowledging their potent effects and the fine line between beneficial and harmful doses. This perspective reflects a growing awareness in the medical community of the complexities associated with herbal remedies and the importance of rigorous scientific inquiry.​

Hortus Medicus stands as a significant contribution to the field of medical botany, offering insights into the medicinal and toxicological aspects of plants used in 19th-century British medicine. Its detailed descriptions and analyses provide a historical snapshot of medical practices and botanical knowledge, serving as both a practical guide for contemporary practitioners and a valuable historical document for modern researchers. The work exemplifies the integration of botanical science with medical practice, reflecting the enduring importance of plants in the healing arts.