Specialty Gardening: What flower says Summer is here?, 1 by Illoquin

Illoquin wrote:
The start of summer is Rudbeckia to me. Any of them, perennial or annual; I am pretty sure that's because they are short day flowering plants, and left to their own devices in the garden, don't bloom until June 22. (I'm told the blooming ones at the garden center were manipulated into thinking it was short days by greenhouse-growing under extra lights, and then decreasing the time on those lights)

Suzy