Here you can see where it is rooted - right against the cement. There a lot of buds for flowers to come. In the second picture, the mandevilla blooms right next to the newcomer.
Here is a picture of how my mandevilla is doing now. Tons of buds on it and it is growing so tall.
Another "free" flower. Portulaca from a hanging basket dropped a seed into a crack on the patio (or the rain washed it there) and now there is a pretty little plant growing from the crack. I am sure if you would try to get one to grow there on purpose, it would never happen. I don't have the heart to pull it! (Click to enlarge)