Method of stimulating plant growth

The method of stimulating a plant substance, the plant substance being a tissue having cells with cellular membranes, comprises the steps of:

• activating a pressure pulse or an acoustic shock wave generator or source to emit pressure pulses or acoustic shock waves wherein the pressure pulses or acoustic shock waves are acoustic pulses which include several cycles of positive and negative pressure, the amplitude of the positive part of such a cycle being above 0.1 MPa having rise times of the positive part of the first pressure cycle amplitude being below 100's of ns and the duration being below 1 to 3 micro-seconds (μs) for the positive part of a cycle and above some micro-seconds for the negative part of a cycle;
• and
• subjecting the plant substance to the pressure pulses or acoustic shock waves stimulating said substance with convergent, divergent, planar or near planar acoustic shock waves or pressure pulses in the absence of a focal point impinging the plant substance stimulating a cellular response in the absence of creating cavitation bubbles evidenced by not experiencing the sensation of rupturing cellular membranes of the cells caused by the emitted waves or pulses in the cellular tissue of the plant substance wherein the substance is positioned within a path of the emitted pressure pulses or shock waves away from any localized geometric focal volume or point of the emitted shock waves wherein the emitted shock waves or pressure pulses either have no geometric focal volume or point or have a focal volume or point ahead of the plant substance or beyond the plant substance thereby passing the emitted waves through the plant substance while avoiding having any localized focal point within the plant substance wherein the emitted pressure pulses or shock waves are convergent, divergent, planar or near planar and the pressure pulse shock wave generator or source is based on electro-hydraulic, electromagnetic, piezoceramic or ballistic wave generation having an energy density value ranging as low as 0.00001 mJ/mm2 to a high end of below 1.0 mJ/mm2, the stimulation having a dosage duration between a few seconds to 20 minutes or greater at an energy density in the range of 0.00001 mJ/mm2 to 1.0 mJ/mm2 per shock wave or less while avoiding or minimizing cell or membrane damage or rupturing by not creating cavitation bubbles in the tissue of the plant substance.