This paper presents the results of a detailed inventory of the historic manor park in Łęczna in the Lublin Voivodeship, conducted in the year 2011. This object is an example of combining elements of the eighteenth-century Italian garden with the nineteenth-century landscape park. The park area is 12 hectares. A user of the area is the King Casimir School. A detailed dendrological inventory of the park revealed 932 items, including 852 trees and 25 large groups of shrubs. Tree stand of the park in Łęczna is represented by 32 species and varieties of trees. In terms of numbers prevail: Tilia cordata Mill., Acer platanoides L., Fraxinus excelsior L., Carpinus betulus L. and Robinia pseudoacacia L. Rare species of the foreign origin are Acer platanoides ‘Schwedleri', Acer saccharinum ‘Wieri', Cladrastis lutea Rudd., Gleditsia triacanthos L., Platanus ×hispanica 'Acerifolia', Quercus macrocarpha Michx. and Pinus nigra J. F. Arnold. The possibilities and directions of restoration presented in this work are based on the collected data. ...