A fermented material included stalk particles of monocotyledonous flowering plants which can constitute a sustainable, ecofriendly & bio-sourced material. More particularly, the fermented material includes stalk particles of monocotyledonous flowering plants and at least one filler (clay), wherein: (a) the particles have a size given by their greatest dimension Dg, in mm such as: Dg≤30; (b) the
specific density Ds of the material, in g
dry matter per
liter such as 100≤Ds≤250; (c) the specific
water content Cw of the material is, in % by
mass such as 55≤Cw≤95; and the carbon /
nitrogen ratio C / N of the material is such as 60≤C / N. A method is provided for the production of this fermented material.