Lots of flowers willows hazel snowdrops early on then lots of weeds dandilions, trees, Rose bay willow herb, Hogweed, thistles, etc. which grow on my bit + all the flowering stuff in the big estate
Balsam later in year.
Last year they mainly foraged in the supers and ate the whole lot
I have the microscope off the top of the cupboard again for the nosema checks so might do some pollen sampling this year