>...I didn't know that some plants can be pollinated by either wind or bees,


A major example is oilseed rape - which, incidentally, will also
self-pollinate if all else fails.

Here it is flowering earlier each year and this produces two problems - bees
not strong enough to get a decent crop or, like this year, cool, dry, windy
weather conditions with bees confined to their hives.  This led to the rape
being wind pollinated so that by the time the weather improved for the bees
much of the crop had gone over.  Often the petals do not fall immediately
giving the impression that there is still plenty of mileage left, but a
heavy shower of rain will knock them off and reveal the true situation.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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