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Onehunga Weed - also known as Prickle Weed or Bindii - is an annual weed which looks like a small ferny rosette about 20mm in diameter. Flowers are tiny and a greenish-yellow colour. Seeds germinate in autumn but the Onehunga Weed doesn’t put on much growth until spring. By the middle of spring each rosette of leaves contains a flower head with many spines. Seeds mature and drop from the plant by about the middle of summer. Onehunga Weed seed is spread by foot traffic or on the fur of animals. The best time for control is when the plants are putting on their flush of growth during spring.
When the seed heads have formed, uptake of herbicide is limited and control is usually not very successful.