No, it's not May. And yet...
This spring, just as the wisteria was about to bloom, we were hit by a dry spell. Or maybe it got too cold. We weren't here so I can't say for sure, but when we got back to the house the wisteria buds were shriveled and dry. I was pretty sure the plant wasn't dead. (Could you kill it if you tried?) Sure enough, it soon leafed out and began its usual, rampant growth.
About three weeks ago I pruned back the vine. Pruned the hell out of it. And last weekend I'll be damned if I didn't see flower buds. What the?! It hadn't been my intent to provoke bloom, I just wanted to reduce the size of the vine, make it more manageable, keep it from pulling down the house.