2011 Michael Perlmutter 2021 peterzika 2011 Michael Perlmutter 2021 peterzika 2011 Michael Perlmutter 2010 Daniel Gluesenkamp 2022 ivykae 2023 lg_meanders
Gunnera tinctoria is a perennial herb (aquatic) that is not native to California.
There is a high risk of this plant becoming invasive in California according to Cal-IPC.
[www.iucngisd.org] Ecological impact, invasiveness: Law (2003) report that, "G. tinctoria shades out rare and endangered indigenous flora and fauna. The huge leaves of each G. tinctoria mean it can impact on a disproportionately large number of the comparatively small, native herbs. Areas that have been cleared of mature G. tinctoria can become re-colonized with numerous seedlings from the original plants, and pieces of the rhizomes that break off will also re-grow. In areas with harsh winter frosts, G. tinctoria is deciduous or semi-deciduous. Once established, it is very invasive and forms dense colonies that shade-out or suppress desirable flora. These characteristics have contributed to it being a serious threat to indigenous biodiversity values in areas it has invaded ". Weedbusters (2003) report that G. tinctoria can block drains and streams; and obstruct access to natural and recreational areas. (link added by Mary Ann Machi)
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Suggested Citation
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 07/15/2025).