On March 12, 1945, a meeting of the Council of the Faculty of Horticulture took place in Skierniewice, during which decisions were made to restore it. The official inauguration of the academic year took place in Warsaw on May 15, 1945. In the academic year 1945/46, work at the Faculty began in 12 Departments (the names of their heads are given in brackets):

• Landscape Architecture and Park Studies (prof. F. Krzywda-Polkowski);
• Phytopathology (Prof. J. Kochman);
• Plant Physiology (Prof. M. Korczewski);
• Plant Genetics and Breeding (Prof. E. Malinowski);
• Soil Science (Prof. A. Musierowicz);
• Floriculture and Municipal Gardening (doc. St. Wóycicki);
• Mechanization and Agricultural Machine Science (prof. Cz. Kanafojski);
• Beekeeping (under the supervision of the Rector, Prof. F. Staff);
• Orcharding (from May 1946 – after returning from the USA – prof. Sz. A. Pieniążek);
• Mathematical Statistics (acting head, engineer W. Pytkowski);
• Growing and Breeding Vegetables (prof. E. Chroboczek);
• Cultivation and Fertilization of Roles (Prof. F. Majewski).

The Department of Geography and Ecology of Cultivated Plants (Dr. Aniela Kozłowska resigned from work at the Warsaw University of Life Sciences) and the Department (Laboratory) of Wood Science (Prof. R. Kobendza took up the duties of deputy professor at the Faculty of Forestry), which existed before the war, were not reactivated. In the 1950s and 60. There were multiple changes to the structure of the Faculty, names of units and study programs. New institutes, departments and departments were created, some of them were transferred to other departments of the Warsaw University of Life Sciences, and some of them went to the Faculty of Horticulture. On September 1, 1951, the regulation of the Minister of Higher Education and Science (Journal of Laws of the Polish People’s Republic 61/51) entered into force, introducing many changes in the structure of the Warsaw University of Life Sciences, which were unfavorable for the Faculty of Horticulture. The name “cathedral” appeared in addition to the previously used name “factory”. The Department of Plant Protection was transferred to the Faculty of Agriculture (it was created as a result of the transformation of the Department of Phytopathology, after a year it returned to the Faculty of Horticulture) and the Department of Soil Cultivation and Fertilization (also after a year it returned to the Faculty of Horticulture as a Department operating within the Department of Vegetable Crops). The Faculty has irretrievably lost the Departments of Plant Physiology, Soil Science, Food Technology and Mathematical Statistics, which were transferred to other departments of the Warsaw University of Life Sciences. The Department of Fruit-growing in Skierniewice had to hand over its experimental and didactic base (Pomological Garden, part of the Experimental Field) and large fruit farms in Dąbrowice, Nowa Wieś and Sinołęka, taken over by the Warsaw University of Life Sciences in 1945-1948 as part of the agricultural reform. In 1950, The Department of Landscape Architecture and Park Studies was transformed into the Department of Landscape Design and Decoration, prof. Alfons Zielonko. In 1952 was established at the Faculty, during the last three semesters of the engineering course, specialization in shaping green areas. In 1954, the Green Area Development Section (SKTZ) (Official Journal of the Ministry of Higher Education and Science 13/54) was established at the Faculty. In 1955, the Department of Green Areas Arrangement and Conservation and the Department of Green Areas Design (Władysław Niemiec (Niemirski)) were established there. In September 1956, the authorities handed over the land and buildings of the Agricultural Staff Training Center in Ursynów (Regulation No. 327 of the Prime Minister of November 17, 1956), and in 1957 the university took over the key of the so-called Wilanów estates (Wilanów, Wolica, Natolin, Moczydło, Powsin, Ursynów and Obory), which were allocated to the experimental and didactic base, among others for the Faculty of Horticulture. Already this year, some departments of the Faculty moved to Ursynów. In 1958, the Department of Soil Cultivation and Fertilization, headed by prof. Franciszek Majewski. In 1962, doc. Jan Boczek took over the head of the Department of Applied Entomology. Shortly thereafter, the Department of Plant Protection was divided into two: the Department of Phytopathology and Applied Entomology. A year later, the Department of Vegetable Crops was moved from Skierniewice to Ursynów, after it was created from the Department of Vegetable Crops in Skierniewice – the Institute of Vegetable Crops. In 1970, the state authorities carried out a large-scale reorganization of the university. The departments were closed and were combined into larger units – institutes. Three such units have been established at the Faculty of Horticulture. The Institute of Horticulture includes the existing Departments of Ornamental Plants, Horticulture, Vegetable Crops, Soil Cultivation and Fertilization, and Medicinal and Special Plants. The director of the Institute was Prof. Aleksander Rejman, who was later replaced by Prof. Henryk Chmiel. The Departments of Phytopathology and Applied Entomology were merged into the Institute of Plant Protection, headed by Prof. Jan Boczek. A few years later, the Institute of Plant Protection was excluded from the Faculty and obtained the rank of an interdepartmental institute. Both departments forming the SKTZ were merged into the Institute of Landscaping and Nature Protection (IKTZiOP). The function of its director was assumed by Prof. Alfons Zielonko, and after his retirement – Prof. Władysław Niemirski, and then doc. Edward Bartman. In 1973 IKTZiOP was divided into two institutes: Green Areas Management (director prof. A. Zielonko) and Environmental Protection (director Dr. H. Zimny). The Department of Genetics was merged with the corresponding chair of the Faculty of Agriculture and formed the Interdepartmental Institute of Genetics and Plant Breeding (IGiHR). The director of this unit was prof. Stanisław Starzycki, who was soon succeeded by prof. Władysław Byszewski and then prof. Bogusław Kubicki. In 1972, the Faculty Council established research teams in all three Institutes whose names corresponded to the names of the former Departments, and their heads were the current heads of these Departments. Only in IKTZiOP a new team appeared – the Ecology and Environmental Protection Team headed by Assoc. Henryk Zimny. In 1971, the first steps were taken to build a large greenhouse complex and a new building for the Faculty (current building 35). The new greenhouses were put into operation in 1981. In March 1974, the Library of the Faculty of Horticulture was opened. In 1975, at the initiative of Prof. A. Rejman in Błonie near In Prażmów, an experimental field was established for research on the cultivation of highbush blueberries in Poland (head Dr. Kazimierz Pliszka). In 1976 the Experimental Field of the Wilanów Faculty was established, led by Dr. Bolesław Czarnecki. In 1976, the Department of Phytopathology (Prof. Z. Borecki) and the Department of Applied Entomology (Prof. J. Boczek) were established at the Institute of Plant Protection, and 3 Departments were established at IGiHR, including the Department of Genetics and Horticultural Plant Breeding (Prof. B. Kubicki ). In the following years, the Department of Horticulture Organization and Economics (Prof. N. Krusze) was transferred from the Faculty of Agriculture and Economics to the Faculty of Horticulture, the Institutes of Green Areas Management and Environmental Protection were merged, and the Institute of Plant Protection was transformed into an interdepartmental unit. Pursuant to the Act on Higher Education of 1982, institutes were dissolved and returned to chairs as the basic organizational units of faculties. The organizational structure of the Faculty of Horticulture, established at that time, has been preserved, with minor changes, to this day. At that time, Chairs were established (the names of their heads are given in parentheses):

• Applied Entomology (Prof. J. Boczek);
• Phytopathology (Prof. Z. Borecki);
• Genetics and Breeding of Horticultural Plants (Prof. B. Kubicki);
• Environmental Protection (Prof. H. Zimny);
• Organization and Economics of Horticulture (Prof. N. Krusze);
• Designing in Landscape Architecture (Prof. W. Niemirski, and then Prof. E. Bartman);
• Ornamental Plants (Prof. H. Chmiel) with the Department of Dendrology and the Department of Ornamental Plants;
• Fruit Industry (Prof. A. Rejman);
• Cultivation and Fertilization of Horticultural Plants (Prof. JR Starck);
• Landscape Organization and Nursing (Prof. T. Szczęsny, and then Prof. L. Majdecki);
• Vegetable and Medicinal Plants (Prof. H. Skąpski) with the Department of Medicinal and Special Plants and the Department of Vegetable Crops.