'Weeds' vs invaders: Supporting gardeners

Gardeners are a key front line against invasive species – one of the five direct drivers of global change in nature – but current understanding is insufficient to empower gardeners in the management of invasive plants, a new study has found.

Researchers from the University of Reading and Royal Horticultural Society have identified the gaps in knowledge that need to be addressed before gardeners are able to tackle the problem of invasive ornamental plants in their gardens, and beyond, helping to protect the surrounding environment.

Published in the January edition of the journal Environmental Science and Policy, the research found that while there was some overlap in understanding invasive species between gardeners and scientists, this wasn’t enough to avoid escape of these species from gardens into the wild.

The researchers argue that better mutual understanding of what constitutes an invasive species will encourage environmentally sustainable gardening. Gardeners need a clearer appreciation of these criteria, to avoid unintentionally introducing invasive species, such as montbretia, variegated yellow archangel, or skunk cabbage, into the wild.

The study analysed survey responses from over 200 British gardeners, most of whom were visitors to the University of Reading exhibit at the RHS Chelsea Flower Show (images attached).

In addition to shared understanding of what constitutes an invasive species, control was a critical factor. Invasive plants are described by the gardeners as fast-spreading and difficult to eradicate.

Lead author Tomos Jones explained: "It's important that scientists understand gardeners' perspectives. Some responses suggested gardeners may conflate invasive plants and weeds. But they clearly recognise the issue of invasive species and are willing to engage on solutions. This study should inform that dialogue, and policies to support consumer education."

The research raises the possibility of influencing behavioural change amongst horticultural suppliers and gardeners more effectively, in the pursuit of better control of invasive and potentially invasive species.

Further research will focus on understanding from where and how gardeners obtain their knowledge or awareness of invasive ornamentals, with the aim to establish how to reach out to gardeners most effectively.