Working knowledge of: the classification and identification of native plants and ornamental trees; the growth habits, parasites, diseases, habitat, and life histories of native plants and ornamental trees; sources of native plants; soil amendments and fertilizers; irrigation methods, needs, and materials; erosion control methods and materials; planting monitoring and maintenance methods; tree management principles and methods; research methodologies; forestry, woodland and range resource management; techniques used in arboriculture; considerations needed to design, locate, and construct revegetation projects in urban and natural settings and to be compatible with the desired function of flood control, water supply, and sanitation facilities; arboricultural considerations in the design, location, and construction of public projects. Ability to: analyze and design project reports and determine probable effect on environment; write effectively and to use good judgment in the assembling, evaluation, and use of information; prepare and present various reports on the effect of projects on the environment to advisory boards, commissions, and elected bodies; assist in planning, scheduling, and training of other employees; make mathematical calculations; analyze situations accurately and adopt an effective course of action; establish and maintain effective relationships with other staff members, staff of other agencies, organizations, and the general public; prepare and disseminate information to media and others; prepare a wide range of clear, concise and informative reports, correspondence and brochures; operate office equipment including computers and supporting word processing, spreadsheet, and database applications.