A process for operating a culture facility for Lemnaceae, wherein the Lemnaceae are cultivated in a stacked culture tray system with an aquatic production area, wherein the Lemnaceae are collected by cyclically and partially harvesting the aquatic production area, wherein the Lemnaceae grow back on the aquatic production area until the following harvest, - wherein the culture is populated by seeding with Lemnaceae initially along a growth sigmoid to a coverage state of more than 50% above the species- and light-dependent maximum possible coverage (Wmax) ascertained beforehand, - wherein, after populating the culture to more than 50% of the maximum possible coverage (Wmax), an amount of 5%-70% of the respective coverage is harvested at cyclically recurring intervals of time (At), referred to as harvest cycle times, - wherein the harvest cycle times and the harvest amplitudes transform the original growth sigmoid to a saw tooth curve, characterised in that - the harvest cycle times are predeterminedly optimised via a modelling of the growth process using the culture parameters of temperature, carbon dioxide concentration, nutrition and/or light supplied to the Lemnaceae, which are fed into a controller of a harvesting unit (10, 11) or a harvesting method as respective control variables for determining an optimum moment for triggering a harvest time, wherein in the event of fluctuation of one or more of said culture parameters within the culture facility the respective harvest time and/or a respective harvest amplitude are automatically readjusted by adaptively readjusting either the control targets of the control variable for the culture parameters of temperature, carbon dioxide concentration, nutrition and light supplied to the Lemnaceae when determining any fluctuation of one or more of these culture parameters, or by triggering a new modelling of the growth process which takes into account said fluctuation of the one or more culture parameters, and calculates, on this basis, a new optimum moment for triggering the harvest time, and updates said moment in the controller of the harvesting unit (10, 11). - wherein the culture is populated by seeding with Lemnaceae initially along a growth sigmoid to a coverage state of more than 50% above the species- and light-dependent maximum possible coverage (Wmax) ascertained beforehand, - wherein, after populating the culture to more than 50% of the maximum possible coverage (Wmax), an amount of 5%-70% of the respective coverage is harvested at cyclically recurring intervals of time (At), referred to as harvest cycle times, - wherein the harvest cycle times and the harvest amplitudes transform the original growth sigmoid to a saw tooth curve, characterised in that - the harvest cycle times are predeterminedly optimised via a modelling of the growth process using the culture parameters of temperature, carbon dioxide concentration, nutrition and/or light supplied to the Lemnaceae, which are fed into a controller of a harvesting unit (10, 11) or a harvesting method as respective control variables for determining an optimum moment for triggering a harvest time, wherein in the event of fluctuation of one or more of said culture parameters within the culture facility the respective harvest time and/or a respective harvest amplitude are automatically readjusted by adaptively readjusting either the control targets of the control variable for the culture parameters of temperature, carbon dioxide concentration, nutrition and light supplied to the Lemnaceae when determining any fluctuation of one or more of these culture parameters, or by triggering a new modelling of the growth process which takes into account said fluctuation of the one or more culture parameters, and calculates, on this basis, a new optimum moment for triggering the harvest time, and updates said moment in the controller of the harvesting unit (10, 11).