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Worldwide, invasive alien plants are considered to be a major threat to biodiversity and ecosystem services, with the threat deemed to be increasing (Maxwell et al. 2016). Emerging alien species, also called sleeper weeds, are species previously thought to be benign but that may turn invasive; or species that have naturalised but not yet expanded their populations exponentially; or species currently only present in a small area but having the potential to spread widely (Boy & Witt 2013; Cunningham et al. 2003; Groves 1999; Thuiller et al. 2005; Williams & West 2000). These species should be closely monitored and assessed for their invasion capacity and timeous decisions made on management actions to be taken. Early detection forms a key component of invasive plant management (Brooks & Klinger 2009) with rapid response in the form of eradication of single plants or small invasions being among the best investments that can be made (Rejmánek & Pitcairn 2002). Rapid response is more effective than delayed implementation of alien plant management strategies (Millar, Stephenson & Stephens 2007; Wilson et al. 2014). Knowledge of the incidence of alien plants and monitoring of changes in their status underpin sound management interventions (Blackburn et al. 2014; Wilson et al. 2014) and as such are mandated by the National Environmental Management: Biodiversity Act (NEMBA, Act 10 of 2004) in South African protected areas (Foxcroft et al. 2017; Wilson et al. 2017).

Use of a rapid roadside survey to detect potentially invasive plant species along the Garden Route, South Africa