These plants have a 2-year 'growth cycle'. [=the plants live and die within two years]
The water is 'cycled' back into/through the system after it has been used.
We have to wait for the dishwasher's wash and dry 'cycles' to end.
(..) (GROANING) THOR: No! (YELLS) (GRUNTS) ERIK: and once a cycle, all the worlds align. Imagine... Imagine that this is our world. Oh, thank you. And this is another world. (..)2013 Thor: The Dark World