Best of Mayfly is usually in June
But then, as if in compensation, there was an unusually fine show, particularly in areas of the country with lime rich soils.
May blossom, like the Mayfly, was named before Pope Gregory revised the calendar. In the Middle Ages the month of May occurred about two weeks later in the year than it does nowadays so best of the blossom and the best of the Mayfly is usually in June.