>With a few exceptions, plants in the mint family are not significant pollen
sources, though some are visited heavily for nectar. 

I think this is the answer.  Today I spent some time watching bees on the
thyme in our garden; they were working at a frantic speed but not one had
any pollen loads.

Howes ('Plants and Beekeeping') gives thyme as a good source of nectar but
does not mention pollen.  Oddly, Eva Crane's book 'Honey' does not even list
thyme in the index, but it is shown as a good source of nectar in the tables
that rate plants for honey production.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W
Where the end of the drought is nigh!

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