A meeting of the Council of the Faculty of Horticulture was held in Skierniewice on 12 March 1945, at which decisions were taken to reconstitute it. The ceremonial inauguration of the academic year took place in Warsaw on 15 May 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);
• Genetics and Plant Breeding (Prof. E. Malinowski);
• Soil Science (Prof. A. Musierowicz);
• Floriculture and Urban Horticulture (doc. St. Wóycicki);
• Mechanisation and Agricultural Engineering (Prof. Cz. Kanafojski);
• Beekeeping (under the supervision of the Rector Prof. F. Staff);
• Orchard Management (from May 1946 – after his return from the USA – Prof. Sz. A. Pieniążek);
• Mathematical Statistics (Acting Head, Eng. W. Pytkowski);
• Cultivation and Breeding of Vegetables (Prof. E. Chroboczek);
• Cultivation and Fertilisation of Agriculture (Prof. F. Majewski).

The pre-war departments were not reactivated: Department of Geography and Ecology of Crops (doc. Aniela Kozłowska resigned from the SGGW) and Department (Laboratory) of Tree Science (Prof. R. Kobendza took over as Deputy Professor at the Faculty of Forestry). In the 1950s and 60. There have been repeated changes to the structure of the Faculty, names of units and study programmes. New institutes, chairs and plants were created, some of them were transferred to other SGGW faculties, while others were transferred to the Faculty of Horticulture. On 1 September 1951, a decree of the Minister of Higher Education and Science (Journal of Laws of the People’s Republic of Poland 61/51) came into force, introducing many changes in the structure of SGGW that were disadvantageous to the Faculty of Horticulture. The name ‘Chair’ appeared in addition to the previously used name ‘Department’. The Department of Plant Protection (created from the transformation of the Department of Phytopathology, returned to the Faculty of Horticulture after a year) and the Department of Crop Cultivation and Fertilisation (also returned to the Faculty of Horticulture after a year, as a Department operating within the Department of Vegetable Cultivation) were transferred to the Faculty of Agriculture. Irretrievably, the Faculty lost the Chairs of: Plant Physiology, Soil Science, Food Technology and Mathematical Statistics, which went to other faculties of the SGGW. The Faculty had to hand over its experimental and didactic base (Pomological Garden, part of the Experimental Field) as well as large fruit farms in Dąbrowice, Nowa Wieś and Sinołęka, taken over by SGGW in 1945-1948 as part of the land reform, to the Institute of Pomology being established in Skierniewice. In 1950, The Department of Landscape Architecture and Landscape Design was transformed into the Department of Landscape Design and Decoration, with Prof. Alfons Zielonko as its head. In 1952 a specialisation in landscaping was established at the Faculty in the last three semesters of the engineering course. In 1954, the Section of Landscaping of Green Areas (SKTZ) was established in the Faculty (Official Gazette of the Ministry of Higher Education and Science 13/54). In 1955, the Department of Landscaping and Maintenance of Green Areas and the Department of Design of Green Areas (M.Sc. Władysław Niemiec (Niemirski)) were established there. In September 1956 the authorities handed over to SGGW the land and buildings of the former Centre for the Training of Agricultural Personnel in the Ursynów area (Decree No. 327 of the Prime Minister of 17.11.1956), 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 used as an experimental and teaching base, among others, for the Faculty of Horticulture. Already that year, some of the Faculty’s departments moved to Ursynów. In 1958, the Department of Soil Cultivation and Fertilisation headed by Professor Franciszek Majewski returned to the Faculty. In 1962, doc. Jan Boczek took over as head of the Department of Applied Entomology. Shortly thereafter, the Department of Plant Protection was divided into two: Department of Phytopathology and Department of Applied Entomology. A year later, the Department of Vegetable Science was moved from Skierniewice to Ursynów, after the establishment of the Vegetable Science Department in Skierniewice into the Vegetable Science Institute. In 1970 the state authorities carried out a large-scale reorganisation of the university. Departments were abolished and merged into larger units – institutes. Three such units were established at the Faculty of Horticulture. The Institute of Horticultural Production was made up of the existing Faculties of Ornamental Plants, Orcharding, Vegetable Production, Crop Production and Fertilisation, and Medicinal and Special Plants. Professor Aleksander Rejman, who was later replaced by Professor Henryk Chmiel, became Director of the Institute. The Departments of Phytopathology and Applied Entomology were merged to form 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 acquired the status of an interdepartmental institute. The two departments forming the SKTZ were merged into the Institute of Landscaping and Nature Conservation (IKTZiOP). Its director was Prof. Alfons Zielonko, and after his retirement, Prof. Władysław Niemirski, and then Associate Professor Edward Bartman. In 1973, IKTZiOP was split into two institutes: Landscaping (Director Prof. A. Zielonko) and Environmental Protection (Director Associate Professor H. Zimny). The Department of Genetics was merged with an analogous department of the Faculty of Agriculture to form the Interdepartmental Institute of Genetics and Plant Breeding (IGiHR). The director of this unit was Prof. Stanisław Starzycki, who was soon followed by Prof. Władysław Byszewski and then by Prof. Bogusław Kubicki. In 1972 the Faculty Council set up research teams in all three Institutes, whose names corresponded to those of the former Departments, with the former heads of these Departments as their heads. Only in the IKTZiOP did a new team appear – the Ecology and Environmental Protection Team headed by Associate Professor Henryk Zimny. In 1971, the first steps were taken to build a large greenhouse complex and a new building for the Department (the present Building 35). The new greenhouses were put into use in 1981. In March 1974, the Library of the Faculty of Horticulture was opened. In 1975, on the initiative of Prof. A. Reyman, an experimental field for research on the cultivation of highbush blueberry in Poland was established in Błonie near Prażmów (supervisor: Dr Kazimierz Pliszka). In 1976 The Experimental Field of the Faculty in Wilanów, headed by Dr Bolesław Czarnecki, was established. 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, while 3 Departments, including the Department of Genetics and Breeding of Horticultural Plants (Prof. B. Kubicki), were created at the IGiHR. In the following years, the Department of Organisation and Economics of Horticulture (Prof. N. Krusze) was transferred from the Faculty of Economics and Agriculture to the Faculty of Horticulture, the Institutes of Landscaping and Environmental Protection were merged, and the Institute of Plant Protection was transformed into an interdepartmental unit. Under the Higher Education Act 1982, the institutes were dissolved, reverting to chairs as the basic organisational units of the faculties. The organisational structure of the Faculty of Horticulture established at that time has been preserved with minor changes to the present day. Chairs were established at that time (the names of their heads are given in brackets):

• Applied Entomology (Prof. J. Boczek);
• Phytopathology (Prof. Z. Borecki);
• Genetics and Breeding of Horticultural Plants (Prof. B. Kubicki);
• Environmental Protection (Prof. H. Zimny);
• Organisation and Economics of Horticulture (Prof. N. Krusze);
• Design in Landscape Architecture (Prof. W. Niemirski, followed by Prof. E. Bartman);
• Ornamental Plants (Prof. H. Chmiel) with the Department of Dendrology and the Department of Ornamental Plants;
• Orchard Management (Prof. A. Rejman);
• Cultivation and Fertilisation of Horticultural Crops (Prof. J. R. Starck);
• Landscaping and Landscape Management (Prof. T. Szczęsny, followed by Prof. L. Majdecki);
• Vegetables and Medicinal Plants (Prof. H. Skąpski) with the Department of Medicinal and Speciality Plants and the Department of Vegetables.