Abstract: The present invention relates generally to agriculture and irrigation of plants. A watering system comprising a master unit and one or more node units are able to carry out bidirectional communication via a power control bus, which may be a coaxial cable. The power control bus provides power and data communication to one or more node units. The one or more node units are configured to receive, carry out actions, or respond to queries from a master unit. Actions that may be taken by one or more node units may include the operation of irrigation valves and query of data related to moisture or other chemistry of a plant growing soil. A master unit may connect to an internet cloud via Wifi or other communication method, wherein a watering system of the present invention may be operable based on at least one data from an internet cloud.