Action: Crassula helmsii: Use hot water to control plants
Key messagesRead our guidance on Key messages before continuing
- We found no evidence on the use of hot water to control Crassula helmsii.
'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.
Treatment with hot water can kill Crassula helmsii (Anderson et al. 2015), and could potentially be used to control small local patches of the plant. However, if it opens up bare patches of earth, this may provide suitable conditions for recolonization by C. helmsii (Ewald 2014).
Treatment of equipment with hot water to prevent spread is discussed in ‘Decontamination to prevent spread’. Studies that used hot foam to control C. helmsii are described in ‘Use hot foam’.
Anderson L.G., Dunn A.M., Rosewarne P.J. & Stebbing P.D. (2015) Invaders in hot water: a simple decontamination method to prevent the accidental spread of aquatic invasive non-native species. Biological Invasions, 17, 2287-2297.
Ewald N.C. (2014) Crassula helmsii in the New Forest. Final report on the status, spread and impact of this non-native invasive plant, and the efficacy of control techniques following a 3 year trial. Prepared on behalf of the New Forest Non-Native Plants Project, Freshwater Habitats Trust, Oxford, UK.