The present invention relates to compacted, compressed or pressed plant growth substrates and to methods for obtaining the present compacted plant growth substrates. Specifically the present invention relates to methods for providing a compacted plant growth substrate block comprising: a) washing composted organic substances by mixing composted organic substances with water for providing a slurry b) sieving and/or sedimenting the slurry thereby separating the slurry into a semi-solid and liquid fraction c) drying the semi-solid fraction obtained in step (b) d) mixing the dried semi-solid fraction with a carrier for providing a growth substrate e) compressing said growth substrate into blocks, thereby providing plant growth substrate blocks capable of providing a growth substrate for one or more plants, preferably seedlings and/ or young plants and/or plant cuttings.
