In the individual segments fit per 3 plants, for a total of 9 - perfect.
Due to some reviews I was concerned that commercial herb pots do not fit. The worry was completely unfounded, if you do not bring XXL herbs, but the normal potty, these fit loosely into it and need some extra earth.
The fact that you can fill up the middle of the segments with the earth, the plants have plenty of space to Wuzeln (the court would for a 4 plants rich if not there or the chain the next segment would be).
Also, the water tank is very good, can be removed if necessary.