Foeniculum vulgare (fennel) CABI. Summary of Invasiveness Top of page. Foeniculum vulgare, also known as sweet fennel, is a common kitchen herb used around the world but it is also a highly invasive weed that can severely damage ecosystems.A risk assessment prepared for Hawaii gave the species a high risk score of 19 ().F. vulgare is known to alter fire regimes and create dense stands ...
