Aquilegia, otherwise known as Granny's bonnet or Columbine, is to me the flower that signals Summer is on it's way...arriving as they do after the other Spring flowers and filling my garden with their beautiful, delicate petals. I've never planted any and the varieties that self seed are all the common Aquilegia Vulgaris, I think...but I would miss them so much if they failed to appear. They are particularly lovely in the evening light, lit from behind as the sun is decending. Their flowers form a backdrop to our early Summer days, appearing in every corner of the garden, in shades from the palest pink through blues and purples...some single blooms and others like little fluffy pom poms. The bees love them too and whenever you are near them you hear the distictive low buzz of multiple visitors enjoying their nectar.
How about you? What flower means Summer to you?