Nasturtium Mystery

Just cant figure out how this nasturtium managed to get onto the rooftop garden which is three floors up!  A nice mystery ; )
We’ve had a quite hot day today at 30c whew, a reminder of whats to come this summer ugh!!  
I spotted all the mosses on the afternoon walk in the heat and took a few shots, they’re all dried out and really red, looking rather good actually, collages  in extras along with a few other weedy flowers.