I have to say that I also tried to plant prickly plants below my DK's windows. It only occured to DH & I because of that Pyracantha that was by my window as I was growing up. My parents didn't plant it as it was there when they bought the house & my DM likes Pyracantha. I too like a lovely Pyracantha. I have one that is an off-spring of the one my DGDad had here. It is growing slowly. I am training it to grow Espalier. That is up against the wall while cutting all the branches that grow out. I have to prune it regularly, just a bit at a time.