VIGOR 53 from J. J. Mauget is derived from phosphorous acid and potassium hydroxide and is a nutritional supplement for a variety of tree crops. This combination product works well in a total PHC program that emphasizes natural plant health defense systems. The additional potassium aids in leaf thickening, better stem and root development, and stimulated frost or cold damage recovery. University research has extensively demonstrated the ability of potassium to aid in the recovery of leaf and stem diseases as well as other stress agents involved in drought avoidance. It may rapidly improve root, stem, and leaf growth.