Foeniculum vulgare is an erect, robust and many stemmed perennial herb strongly smelling of aniseed. Wild fennel has small yellow flowers in clusters grouped in umbrella shapes. Seeds are 3-6 mm long and yellow brown. Seeds are dispersed by water, wind, machinery, slashing and in soil. Wild fennel invades pastures and bushland.
Manual control
Fennel can be grubbed out, all root material will need to be removed.
From SGLN’s 2017 weed guide.
Herbicides must be applied at the appropriate rate as specified on the label and all safety precautions followed. If chemical control is necessary near drainage lines or streams, use extreme caution as the effects on aquatic life can be devastating even in minute amounts. Always seek expert advice.
Chemical control notes from SGLN’s 2017 weed guide
Spray plants from spring onwards when growing well. Chemical; Kamba M. Always check the herbicide label before use.
These notes are from 2017, and some information, particularly herbicide information, may be out of date. Please ask local suppliers and do your own research in selecting herbicides if choosing chemical control.
Family, origin, type, plant instead, control methods and the note above are from SGLN’s pocket guide Common weeds of South Gippsland (2026).