Rosemary Honey?

It's warm the bees are having a great time except there is only pollen to collect - no nectar. Hopefully soon the dandelions will appear, the major honey source for beekeepers in this area.

For some reason the bees have taken a huge liking to some herbs I bought in the garden centre. Above all the soil around the rosemary. I wonder why? There's plenty of water around, could it be something connected with the oil? Answers on a postcard.....