Grey box has started already, about 2 weeks ago. Never known it to flower in January, but everything's about 3 weeks ahead this season. Well that's around mansfield, yea etc. Blue gum, messmate are doing well in the hills with manna gum and swamp gum to follow.
Your bees will be struggling after Almonds if grey box pollen is all they have had.
I found "feed bee" to be better than "bee build", but wouldn't buy either of them again of I can help it. I hope that helps....
Any stringy bark or blue gum where your grey box location is.?