Fennel Control Guide


Do's and Don'ts of fennel control

Fennel, photo: Tim Rudman

Do's

  • Plan your control program, this will save time and money in the long-run;
  • Consider the impact of your control methods on off-target species, especially if herbicides are used;
  • Ensure machinery and equipment is washed down between sites or prior to contractors leaving site;
  • Get in early - For new infestations, eradicate before the plants reach the flowering stage: once plants begin seeding, control becomes more difficult and expensive;
  • Carefully time your use of herbicide for best results (see Herbicides for Fennel Control for more information);
  • Coordinate your control program with neighbouring landholders where your weed problem crosses property boundaries;
  • Revisit and regularly inspect the site and ensure follow-up is undertaken;
  • Use a combination of different control methods; and
  • Establish vigorous pasture (or native species) after removal to reduce re-infestation.

Don'ts

  • Don't introduce fennel to fennel-free areas (e.g. by failing to wash down machinery and equipment between sites);
  • Don't start your control program without first planning your approach;
  • Don't allow fennel to flower and set seed before treatment;
  • Don't rely on one attempt at removal - follow-up is essential;
  • Don't rely on just one control method.

Spread of fennel

  • Fennel is spread mainly by seed. Fennel seed falls to the ground very near the parent plant.
  • Longer-distance movement of seed occurs where seeds contaminate agricultural produce, machinery, animal skins and human clothing. Seeds are also spread in water along drainage lines.
  • Fennel can regrow from crown and root fragments. Spread occurs when crown or root fragments are moved by cultivation or earth-moving machinery.

Avoid the introduction of fennel

  • Avoid introducing fennel seed or root fragments into clean areas, or into areas from which the weed is being eradicated.
  • Implements and vehicles which have been used on infested areas should be thoroughly cleaned before leaving the site.
  • See the Washdown Guidelines for Weed and Disease Control for detailed information on how to wash-down equipment and personnel to reduce the chance of spreading fennel.

Physical removal

  • Fennel can be grubbed out, but all root material needs to be removed to stop re-sprouting from root fragments.
  • Slashing can be used before and over the flowering period to reduce fennel seeding.

Chemical control

    Important Disclaimer
    To the extent permitted by law, the Tasmanian Department of Primary Industries, Parks, Water and Environment (including its employees and consultants) excludes all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using information or material (in part or in whole) contained on this website.

Back Home