I am in Houston TX, Zone 9, and my sunflowers are growing VERY well. I am growing the Kong Sunflowers and so far, they are as tall as the garage. My question is, I thought only one flower per stalk, however I see what seems to be extra sunflower buds. I know the photo is kind of out of focus, but they look just like little flower buds. Should I leave them alone or pinch them off?