It seems that for the last several years, something that blossoms, sprouts, buds, or otherwise propagates in some form in early May has gotten me all sniffly-sneezy... and by the following April, I've forgotten all about it.  Whee.  Perhaps if I knew what in particular I was allergic to, I'd remember, since I doubt it's as vague as "early May."

Oh well.  This is why we invented Kleenex.  Life goes on.