Wireless sensor networks for greenhouses: An end-to-end review

•Deployment of WSN in a greenhouse helps in better yield with lesser resources.•Proper layout of nodes in a greenhouse reduces cost and provides better coverage.•Sampling techniques should be specifically designed for slowly changing environment of greenhouse.•Zigbee and LoRa suits best for greenhouse environment.•Predictive modeling helps in data reduction. Integration of Wireless Sensor Networks (WSN) in the field of agriculture has provided a new direction for the production of crops. The same can be applied particularly to greenhouses. Greenhouses provide a protected environment for plants and crops. This paper reviews the role of WSN in monitoring of greenhouses. The paper presents an end-to-end survey; starting from the layout of crops in greenhouses, wireless technology used for communication of sensors, techniques to choose transmission interval or rate. Layouts and sampling techniques are also classified and compared. Other than these, the paper also studies various prediction models and decision supporting techniques adopted in greenhouses for efficient integration and management of WSN. These prediction models are also comprehensively analyzed in this work.