We describe the reaction of Umbelliferae family plants caused by Ti, Mn and Cu ions application. The studied material was: Crithmum maritimum L. after fertilization with 0.04% Tytanit (Ti main component) formula on the leaves Pastinaca sativa L. stressed with Cu and Cu + Mn and Tytanit (0.04% and 0.4%) for 24, 48 and 72 h, Peucedanum verticillare Koch, stressed with Cu and Cu + Ti (24, 48, 72 h). The volatile oils content and composition in plants stressed with metal ions solutions depends on many factors. Among them one should mention the method of application (leaves’ fertilization, direct effect), their concentrations, the time of exposition and age of plants exposed to the stress. The reactions of particular plant species to the experimental stress varied.