I have grown Buckwheat for my bees for over a decade.  Yes, I often noticed
the bees were not working the Buckwheat and soon noticed that the bees were
angrier than usual.  Well, an old timer told me that Buckwheat does not produce
nectar in the afternoon.  True enough this seemed to be the case for me.

No Putting it all together I think it is likely that bees will shift to other
flowers in the afternoon and stay with them rather than have to keep hunting
for new sources after the buckwheat's half day production is over.

Has anyone else noticed this half day production?  It is hard to notice or
prove (for my non-scientific observations anyhow), since the bees will keep on
hunting for nectar in the buckwheat for a long time after I believe they are
not finding any for they seem to be getting irate.  Like a rainy day causes.

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