Hawthorn is one of those trees that instinct suggests might well produce an essential oil from the blossom. Certainly there are a number of uses of the tree as an Herbal medicine, though there are many interactions with conventional medications, mainly ones related to the heart and circulatory system though medicines for erectile dysfunction are also mentioned.
I was drawn to check whether this essential oil exists by the aroma and the fact that my bees love it, the tree in my garden being covered with them yesterday.
Sadly, none of the essential oil suppliers I checked out seem to stock it. I was unable even to find anything about the properties of the oil.
This suggests to me that in all probability, any essential oil from May Blossom is too expensive to extract. This means I will have to content myself with smelling it while watching my bees collect both nectar and pollen!