When planting buckwheat in the past I have always timed it for the end of summer flow - I have seen them ignore it completely if blooming during a decent honeyflow. For me they worked it between ten am and one pm, nectar shuts off after that. Mancan will yield honey. How much did you plant? I ask because there could be some competing blooms out there. Good luck and keep us posted!This is what I am finding out. They work it in the morning. The variety I planted was Mancan. It may also be that it hasn't fully bloomed yet or it is not opening up all the way.
Sorry forgot to ask you, how many hives do you have near the buckwheat?I planted an acre within 50 yards of the hives.