Hey Oz,
Have you got your hives around Melbourne? I reckon with all the wet weather we've been having lately that a lot of the nectar is getting washed out of the flowers. I've had a succession of gums flowering around me lately but the girls still aren't bringing a lot in. I harvested a box and a half off 2 hives about 4-5 weeks ago thinking they would quickly refill it, but nada, sweet bugger all.