Mystery plant

A tall plant with non-descript leaves appeared in one of my pots. I thought it was a weed but decided to leave it to see if it would flower. It did! My phone identified it as a Lobelia! I definitely didn’t plant it!

My bird nest box has gone quiet. Hopefully the young have fledged and not roasted! It was cooler today, with white sky in the afternoon replacing the blue. Rain is forecast overnight.,