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Biomass analyses were conducted to evaluate the growth performance of an Alnus incana (L.) Moench stand established for the restoration of a land slide site. The study aimed to pioneer the quantification of biomass accumulation of alders which were planted for soil bioengineering and stabilisation purposes under extreme soil conditions. For above-ground phytomass estimation, allometric functions on a tree component level were created using linear regression analyses after ln-transformation. Based on D130-D10-relations D10-data were applied for function derivation. Best fits were computed using ln-transformed D10 and height data. At 7,023 stems ha−1 (all trees >20 cm height), the total stand biomass added up to 18,000 kg ha−1, had an LAI of 1.5 and indicated a high productivity even under unfavourable soil conditions. In the light of the results, grey alders appear to be highly valuable for growing on slide prone sites, indicating that they also exert a positive influence on the soil water regime and thus on slope stability. [ABSTRACT FROM AUTHOR]