Thinking it is Ageratum conyzoides rather than Ageratum houstonianum according to the distinction in this website: https://keys.lucidcentral.org/keys/v3/eafrinet/weeds/key/weeds/Media/Html/Ageratum_houstonianum_(Blue_Billygoat_Weed).htm
Was laying eggs (pale yellow) on another plant.
Three roosting in the afternoon on Pothos longipes
In private residential garden, spread from original planting site.
Blue-banded bee (Amegilla species) feeding on basil in my garden
On a plant in the Nature strip of Cecil Road, Bardon 4065 QLD there were multiple pollinators via for the flowers:
Glass Wing Butterfly
Blue Banded Bees
Common Mud-dauber Wasps
Honey Bees
Blue Neon Cuckoo Bee
Variegated Lady Beetles
Native Stingless Bees
On Corchorus cunninghamii
Street tree.