In July/August it put up yellow flowers. I considered trying to ID it at that point, but never got around to it. This weekend we were passing by the garden of a community center and my wife recognized their plants were similar to what we were growing. When we got home, we checked the front flower bed and sure enough:
Pumpkins! Last year we took our daughter to a fall pumpkin fest and bought one of these small, all-white pumpkins. We left them on the front porch for halloween and thanksgiving, until they were stolen by squirrels!
It's by far the most random thing I've had spontaneously grow in the yard. The bed received bi-weekly liquid miracle grow and overspray from the lawn's "vitamin M".
