The invention relates to a
photobioreactor (1) for the submerged production of
sphagnum moss, comprising a container (10) with a reactor interior (RI) comprising at least a portion of the reactor interior (RI). The container (10) has a first compartment (11) and a second compartment (12) arranged above the first compartment (11), wherein the compartments (11, 12, 13) form at least a portion of the reactor interior (RI), are substantially transparent, and have a height (H) to
diameter (D) ratio of each compartment of 1 to 2.6. Furthermore, the container (10) has a separating element (14) arranged between the first and the second compartment (11, 12) having a plurality of openings (141) for fluid-conducting connection between the compartments (11, 12, 13) and a closable access opening for adding and removing mineral
nutrient medium and
peat moss gametophytes into or from at least part of the reactor interior (RI).Furthermore, the container (10) comprises a gas
distributor (15) arranged centrally in a lower region (II) of the reactor interior (RI), with a plurality of gas openings for supplying gas into at least a part of the reactor interior (RI) along a gassed sub-region of a
photobioreactor cross-sectional area, and a gas outlet (16) arranged in an upper region (I) of the reactor interior (RI) for removing
exhaust gas from the container (10). The invention further relates to a method for the submerged production of
peat moss, which is carried out using a
photobioreactor (1) according to the invention.