Hi,
we have been struggling to contain this weed around our trees- we have been trying to manually uproot with no avail. We have just planted some lilly pillys last year and dont want to damage them.
Systemic sprays like Zero, Roundup or Slasher will kill green weed growth but not harm the Lily Pillies as long as you don't let it get onto their leaves - and there's no residual action in the soil. (P.S. there was no photo attached but these weedkillers will kill anything small, green and herbaceous, so it won't matter what weed it was).