Clump-forming perennial herb < 2.5 m tall. Rhizomes are stout. Leaves are very large and prickly. Flowers are minute, green and borne on dense, closely branched, < 1 m long conical panicles in early summer. Drupes are c. 2 mm long.
To help protect our environment:
Coastal and riparian areas, cliffs, wetlands, disturbed sites, slips, roadsides.
Seeds dispersed by water, birds, wind and livestock. Vegetative spread from rhizome fragments.
Forms dense colonies, displacing and suppressing native vegetation.
Follow up treated areas 3 times per year. Encourage natural regeneration of native plants or replant treated areas where possible after 2-3 treatments to establish dense ground cover and minimise reinvasion.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.
G. manicata is a larger plant. The inflorescence is longer and less compact. Another difference is between scales which are found at the base of the leaves and inflorescence. In G. manicata there is a prominent development of membranous "webbing" between the main lobes of the scale whereas in G. tinctoria this is not well developed and so the lobes are often almost free to the main rachis of the scale.