It's all about lilacs. This time of year they are everywhere.
But we can also remember Walt Whitman's great lament for Abraham Lincoln When Lilacs Last in the Dooryard Bloom'd. It begins:
When lilacs last in the dooryard bloom’d,And the great star early droop’d in the western sky in the night,I mourn’d, and yet shall mourn with ever-returning spring.Ever-returning spring, trinity sure to me you bring,Lilac blooming perennial and drooping star in the west,