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.

Abstract: A method for improving the rooting soil around a plant by defining an improvement area around the trunk of the plant and utilizing an air excavator to loosen the existing rooting soil in the improvement area, the method also includes treating the existing soil with a treatment to encourage growth of the plant roots in the existing treated soil.