In South Africa, invasive plants such as pine trees and Australian acacias reduce surface water runoff by between 1 500 to 2 500 million cubic metres per year. That is equivalent to the capacity of the Pongolapoort Dam in KwaZulu-Natal. What is being done to address this problem, and how successful are these efforts? Dave Pepler asks a few difficult questions to Prof Brian van Wilgen (DST-NRF Centre of Excellence for Invasion Biology), Dr David le Maitre (CSIR) and Dr Christine Colvin (WWF), during the last Science Café Stellenbosch for Woordfees 2019.

• Science Café Stellenbosch is an initiative of SU's Faculty of Science to promote discussion of scientific issues in a language that everyone can understand.
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• This discussion will take place mainly in English, but questions in Afrikaans are welcome and will be answered in Afrikaans, where possible.​
  
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