A few months ago I planted a "mystery seed" that I found on the floor of the gardening section at the hardware store. The seed was about the size of a peanut -- kind of squarish, dark tan. The seed eventually turned into an ambitious vine, with broad green leaves, and it's been putting out flowers for two or three weeks. They seem to wilt within the day -- this is the first one I've caught open! This bloom is about 5-6 inches in diameter. I
think our mystery plant might be a morning glory, but I'm not sure. Any ideas?