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.