CO2 tablets contain a lot of high quality carbon dioxide. Place one of them in a glass of water to increase the concentration of co2 in the air. They can also be used deeply to absorb co2 through the roots of the plant.
It is recommended to use two tablets on surfaces of 1m2.
Note:Adding CO2 shortly before the darkness does not produce any results!
CO2 is an important source of food for plants. In closed gardens, co2 deficiency is caused by difficult ventilation compared to open spaces. If your plants (or seedlings) are healthy, use one tablet per 100 liters of water half an hour before irrigation. You can also simply dissolve the tablet in a barrel or bucket. Use CO2 tablets twice a week, preferably always with drinking water. Too high a dose is neither harmful nor useful.