With the increasing demand for efficient and sustainable agricultural practices, there is a growing interest in employing wireless sensor networks (WSNs) for environmental monitoring in agriculture. This review paper provides an overview of the current state of the art in utilising WSNs for agricultural monitoring applications. It explores the various sensor technologies, network architectures, and data processing techniques employed in these systems. Additionally, it discusses the challenges and opportunities associated with deploying WSNs in agricultural environments, including power management, data reliability, and scalability. Furthermore, the paper examines case studies and applications of WSNs in agricultural monitoring, highlighting their effectiveness in optimising resource usage, enhancing crop yield, and mitigating environmental impact. Through a comprehensive analysis, this review aims to provide insights into the advancements, limitations, and future directions of environmental monitoring in agriculture using WSNs.