PERMIT 14928 Expires 30/09/2024
Triclopyr 300 g/L + Picloram 100 g/L (Grazon® DS)
Rate: 250-500 mL per 100 L plus BS 1000 or equivalent at 100 mL per 100 L
Comments: Foliar application
Withholding period: Nil.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Hawkweeds are native to the northern hemisphere, South Africa and South America. Several European species have become major weeds of pastures, gardens and natural areas in eastern North America, Japan, Patagonia and New Zealand.
NSW DPI will lead an initial response for the treatment and disposal of the plant to stop it from spreading
Hawkweed seeds usually germinates in spring after rain. Seedlings establish readily on bare soil and disturbed areas.
2008 edition prepared by Annie Johnson; 2012 edition prepared by Elissa van Oosterhout; Reviewed by Scott Charlton, Andrew Storrie and Birgitte Verbeek.
Hawkweed can reproduce and spread both by seed and vegetatively. Vegetative spread of plants by rhizomes (underground stems) and stolons (above ground rooting stems) is common. Stolons arise from buds at the base of the leaves.
Hawkweeds are highly invasive plants forming dense stands of up to 3800 plants per square metre. They are a major threat to biodiversity and a problem in pastures, on roadsides and in gardens.
When to Sow
Cut back after flowering. Will self-seed freely. Deadhead if you do not want volunteer seedlings next season. Can become invasive in warmer regions. Propagate by seed.
Sow Under Cover/Plant Indoors
Prefers any moderately fertile, well-drained soil. Requires little attention.
Approximate number of seeds per packet: 320