I found this plant growing in one of my empty pots. Last year I found the same type of plant growing in a crack between the bricks of my front stoop. I made the mistake of trying to transplant it into a pot. It wilted and died.
Notice the three clover plants in the background on the right side. I didn't notice them until I transferred the photo to this post. They'er beautiful.
The plant is only about two and a half inches tall.
This time I'm going to leave it alone and see what happens.