Osmoform 38N (High N) fertiliser is a slow release nitrogen only fertiliser containing high molecular weight Methylene Urea molecules. Suitable for greening mother stock for propagation, applied to larger plants in tubs and in ground for greening up and promoting leaf growth. The working principal is not based in a coating around the granules like with Osmocote, but on long nitrogen chains breaking down slowly. This process is influenced by temperature, microbiological activity and humidity.