Here is another weed to lookout for and it is very obvious at the moment. Many people think it is native to Australia but unfortunately it is not. Try and remove it before the flowers set seed.
The seed is very fine so if you decide to pull some up make sure you catch the seed and don’t let is spread.
This link provides good information about identification and control.http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0011/347159/awmg_spanish-heath.pdf