In the period from 1900 to 1945 the profession that is today known as the landscape architecture was developing. The paper presents a chronological overview, problem inquiry and analysis of specific problem categories: professional experience, educational and general professional status of the landscape profession in the given period and positioning of profession within the biotechnical, agricultural and technical professions. It ponders and analyses archival records and other historical archival material about the practice, educational and professional status and incentives for the development of the landscape profession. The results show that the key players in establishing profession of landscape architecture were professionals from natural and biotechnical filed: botanists and agronomists, as well as the first educated garden architects who studied garden architecture abroad. In the given period just garden architecture was developed. It was an integral part of the gardening profession and meant designing and constructing parks and other green areas as well as garden art. Scientifically and educationally, the landscape profession has been developed in the biotechnical field but with the knowledge upgrade of technical profession. At that time it was closely related to the City engineering offices as an integral part of urban design. The greatest contribution for developing of the landscape profession was given by individuals gathered at Horticultural Society in Zagreb: V. Vouk, Z. Arnold, C. Jeglič, P. Ungar, S. Klaić and E. Polak.