Let's play this oh so fun game once again!
This volunteer plant seems to be very happy, sending up large, thin, heart-shaped, slightly hairy leaves. The plant is about 12 inches high now. I don't see any buds yet. Oh, and the whiteflies are enjoying it.
I did wonder if it was a melon plant because last year I planted a melon vine just a few feet from this spot and I thought a seed might have gone astray. But I can't remember exactly what those leaves looked like and I don't see any sign of this plant vining yet.
Can you name this plant?