Sphagnum mosses are the most significant genus in the world for carbon sequestration as they form peat, which stores more carbon per hectare than tropical rainforest. Critically, Sphagnum also creates a niche for methanotrophic bacteria, which remove the methane naturally emitted from peatlands. By optimising the mosses we reintroduce during peatland restoration through trait selection in Sphagnum, we can enhance carbon sequestration and reduce natural methane flux.