Notice in the images below that liverworts (Marchantia polymorpha), as well as pearlwort and mosses, grow only where water from the irrigation spray covers.  This is a classic example of how liverworts (and other weeds) thrive in wet environments.

water affects liverwort growth

Liverwort (Marchantia polymorpha)

Liverwort (Marchantia polymorpha)

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