Abstract: A reusable plant injector includes a sealed housing defining a reservoir for containing a pressurized fluid, the housing including an elongated neck having an inner end in fluid communication with the reservoir and an outer end defining a nozzle. An inlet valve is disposed in the housing in fluid communication with the reservoir for receiving a supply of fluid therethrough. A control valve is provided for selectively starting and stopping a flow of pressurized fluid from the reservoir through the neck and out of the nozzle. A method is also provided for treating a plant or group of plants using the described plant injector.