Price is subject to change depending on how much fertilizer is used. Minimum charge can include up to 2 trees. We pierce the ground 9 inches down with a 4-way jetted nozzle. Injecting at 400 psi, we open up the hair roots in the root system of the tree or shrub. This then allows the ground to be aerated giving the root system a concentrated mixture of 11/26/27 or 30/10/10 (dependent on types of trees on property). This is a specially formulated mixture of an all-natural fertilizer produced by the biochemist from Olds College Alberta for our southern Alberta climate. It is a perfectly safe mixture for pets and children and also neutralizes the area of our alkaline soil conditions. We recommend 2 injections per year.