Providing evidence to improve practice

Action: Crassula helmsii: Use liquid nitrogen to kill plants Control of Freshwater Invasive Species

Key messages

  • We found no evidence for the effects of treating Crassula helmsii with liquid nitrogen.

'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action.


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