PM 9/19 (1) Invasive alien aquatic plants


This study is summarised as evidence for the following.

Action Category

Crassula helmsii: Use salt water to kill plants

Action Link
Control of Freshwater Invasive Species
  1. Crassula helmsii: Use salt water to kill plants

    A before-and-after trial in a coastal grazing marsh in Hampshire, UK (EPPO 2014) reported that inundation with salt water nearly eradicated C. helmsii, although no statistical tests were carried out. One year after the seawater treatment, 99% of C. helmsii had been killed. The plant only remained in places not reached by the seawater. Two years after the treatment the salt level had reduced to 2 ppt, but the original flora had not returned. The site was flooded with seawater in July 2008 and then naturally filled with rainwater in autumn 2008. C. helmsii cover was assessed in 2009. No details about the depth of flooding or size of site were provided.


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