In Australia though, it is considered "a weed of national significance" as it has over time, invaded bushland, National Parks, roadside verges and pastures etc. According to this governmental site, the growth then creates increased fire hazards, can restrict access to water and land, and subsequently will decrease property values.
Apart from the above, you have to admire the flower don't you? What a shame, there is a positive ... and a negative. What started out as an introduction from Europe to Australia in the mid 1800's as a horticultural plant, was soon recognised to be a serious weed. More reading if you wish on CSIRO site here.
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