EN
The aim of present study was to estimate the changes in the physical and chemical properties of green roof substrates over four growing seasons. In this study, the green roof substrates used were: a) substrate prepared at the Research Institute of Horticulture in Skierniewice: black mould, calcined clay (4-8 mm), peat, sand, green waste compost: 50:20:15:10:5% (v/v) + PG Mix N.T4-P205:16-K20:18 and b) substrate produced by the MAD AS company. The substrates were characterised well physical and chemical parameters according to quidelines of FLL. Generally, in the commercial substrate the maximum water capacity decreased but organic matter content and air content at maximum water capacity increased during the 4 years of cultivation. In the substrate of the Research Institute organic matter content decreased. Regardless of green roof substrates plant species: Pinus mugo Turra, Campanula cochleariifolia Lam. and Thymus serphyllum L. achieved the aesthetic qualities on the rooftops in 2011.