It very much looks like Weedy Aster. Most weedy varieties of aster produce flowers that have a bright yellow central disc that is actually considered tiny flowers. They are surrounded by a ray of petals that can range in color but generally are white, purple, or pale pink in color.
I recommend using Yates 250ml BuffaloPro Selective Bindii And Broadleaf Weed Killer Concentrate. It's safe to use on Kikuyu, Couch, Buffalo, Queensland blue, Bent, Fescue, Paspalum, and Ryegrass lawns. Please note that this is a concentrate, make sure to read the instructions on how to dilute the product before using it.
If you need further assistance, please let us know.
Need more help. What grass is in my garden? Here is a pic.
And following are weeds
Do we have a 3 in 1, granulated, broadcast able product to take care of post, pre emergence of weeds and fertiliser?
My lawn size is 260 sqm.
I ordered HERBICIDE ALL PURP ROUNDUP 3L RTU I/N: 0090569, before this post. Will use this for the weeds.
If this kills grass, will do selective spraying.
If not will switch to your recommendation. I don't know my grass type being new to the area.
@EricL will be back on the site after the weekend and might have other recommendations. The Yates 250ml BuffaloPro Selective Bindii And Broadleaf Weed Killer Concentrate will kill a variety of broadleaved weeds, so I would spray it over everything and then deal with anything it doesn't kill separately. There's a good chance it will kill at least the weeds in the last three images. In your first picture, I'm not quite sure if that's your lawn or weeds. It appears to be winter grass (considered a nuisance weed), which has overgrown your buffalo or other lawn. You'll likely need to use Winter grass killer to get rid of it. Have a look to see if there is a coarser grass beneath the spindly one with seeds.
We have Scotts Lawn Builder 4kg + Weedkill Slow Release Lawn Fertiliser, but it's not suitable for Buffalo lawn.
Round-up kills everything, so I wouldn't recommend spraying it onto weeds in your lawn. The over-spray will kill the grass around the weed leaving large patches.
The first picture is of the lawn grass and you suggest taken over by winter grass. Now am not sure if buffalo grass or some other type lies below.
Is buffalo grass the common one in the area?
I am going to try out the yates product mentioned.
Will try the garden center they seem to be open.