Abstract: A method for producing deep-rooted trees for phytoremediation applications is shown. The method involves creating a hole of appropriate diameter and depth using direct push technology, installing a subsurface drip irrigation line down the hole, backfilling the hole, and planting a tree or cutting next to or inside the hole. The subsurface irrigation line is connected to a water supply line, to which an in-line aerator (oxygenator) and a nutrient injector apparatus (proportioner) may also be connected. A specific mixture of nutrients, root stimulant, microbes and/or surfactants may be added to the irrigation water via the proportioner with the objective of producing a subsurface environment in which roots can proliferate and the aerobic biodegradation of organic chemical contaminants is enhanced. As the trees develop, irrigation rates are regulated to encourage the drying of the upper soil layers and subsequent rooting in deeper layers of the soil.