Plant Profile: Marchantia polymorpha

Liverworts are ancient, moss-like organisms that create leaf-like mats on the surface of the soil. When these mats are present in container plants and the soil dries out, they can repel water, leading to further drying of the pots.

These plants reproduce primarily through gemmae, which are small structures produced in cup-like formations, and to a lesser extent, by wind-dispersed spores. Rain or irrigation can dislodge the gemmae from their cups, allowing for propagation. Liverworts thrive in cool, moist environments and are commonly found in areas with regular irrigation, such as propagation zones and among herbaceous perennials.

Managing liverworts can be quite difficult. It is advisable to inspect plants prior to purchase and to eliminate any new infestations promptly to prevent their spread. Some preemergence herbicides, mulches, and nonselective contact herbicides can help suppress liverworts. However, persistent infestations may necessitate regular hand weeding and adjustments in cultural practices to achieve effective control.