Precision Agriculture has been playing a significant role in the refinement of plants' health. It ensures that crops and soil receive exactly what they need for optimum health and productivity. The term also involves minimizing pests, unwanted flooding, and disease.This paper gives a review on various plants protection and monitoring techniques. Authors mentioned here have proposed different solutions like use of drone technologies and deep learning methods. Deep learning has been playing a significant role in identifying the diseases in plants. Algorithms like VGG-net, Res-net,CNN and image processing techniques have proved to be significant in recognizing many plant diseases.