"And there it was, overhanging a garden wall. Lilac was common in the city. It was vigorous and hard to kill and had to be. The flower buds were noticeably swelling.
He stood and stared, as a man might stare at an old battlefield."
- Night Watch, Terry Pratchett
This is wisteria, not lilac, but it made me think of this all the same, on this Glorious 25th of May.