At the end of the 19th and beginning of 20th century Liepaja City in the west of Latvia was famous for its landscape designers and greenery cultivation traditions founded by landscape architects, which influenced urban development in several cities of Courland and Semigallia. During the 19th century the resort promoted urban landscaping in Liepaja: public greeneries – parks, alleys and promenades were cultivated in the city and the greenery system was created. Liepaja obtained a fantastic symbol – Rose Square, which reflected the latest tendencies of gardening art in Europe at that time and inspired gardeners of other cities to make creative changes in urban environment. Proclaiming Latvia Republic, the economic structure in the new state changed. All urban municipalities had to take care of the master plan development in order to deal with the issues of the perspective development and functional zoning, create a qualitative urban environment. Since 1925 a high-quality therapeutic mud had been obtained in the surroundings of Liepaja. It was necessary to implement some improvement work on the seashore and in the resort – reconstruct the bath establishment. New master plan was worked out in Liepaja City Board Technical Department to make a qualitative urban environment in the city. The concept of facilitation was changed for Liepaja Seaside Park, and it complied with the development tendencies of public parks, which had appeared in Europe during the interwar period. The public and picturesque plantations were developed in a qualitative way under the guidance of outstanding Latvian gardeners, changing the urban visual image and imparting to it some Latvian characteristics. World War II interrupted traditions of urban creation founded during the Independent Latvia. In Soviet Latvia public environmental work and massive events complying with socialism ideology were organized. In Liepaja on the damaged sites trees were planted without paying any attention to the quality of greeneries. The greenery system was transformed. During the Soviet Latvia transformations of the greenery system connected with functional and ideological changes on the coast of the Baltic Sea: Seaside Park was changed into Culture and Recreation Park, sanatorium was made, Newlyweds Park was cultivated and on the sites, where buildings were destroyed, squares were created and monuments erected on them. In the restored Latvia Republic, without studying the historical greeneries of Liepaja, verdant trees are cut down and the transformation of the greenery system takes place, which does not preserve historical and dendrological values and destroys the balance of urban territories; bright environmental objects distract attention from the drab landscape. The aim and basic methods of the research: to analyse the greenery system of Liepaja at the end of the 19th and beginning of 20th century and the changes implemented during the Soviet times and the restored Latvia Republic, using the method of field-work and photo fixation, inspection greeneries in nature, comparisons and analysis of archives’ materials of urban planning. Study results: study carefully the greenery system of Liepaja, its formation and structure, also determine the main urban changes created by the transformations.