My lilac was blocking some air flow in the front yard.
It had been damaged badly in what the locals refer to as "Snowmageddon" (The February 5–6, 2010 North American blizzard) and I removed a LOT of dead and dying wood last fall.
It's coming back (barely) and I don't even know if it will survive, but I'm hoping.
Anyway, that had me mildewy so maybe it'll be better this year. Just in case, I got the Serenade.