This document specifies references to methods for sampling of soil improvers and growing media and sample preparation of soil improvers and growing media for subsequent determination of quality and quantity. This document is applicable to EU fertilizing products classified as PFC 3, PFC 4 and PFC 7 as long as the main function of the EU fertilizing product is classified as PFC 3 or PFC 4, as specified in the Regulation (EC) No 2019/1009 [2].