Well first I had ants and although it did,now the lower leaves are turning brown! Also is it possible for a sunflower can have more than 1 bloom? As far as the ants,I did spray them with watered down dish soap. I don't know where to go ed Brown leaves ( photo / image / picture from Edlou8181's Garden ) notice extra blooms!!! ( photo / image / picture from Edlou8181's Garden )
Multiple blooms depends on the Species, some do and some don't. It's usually the taller ones that do since they have strong stems to support them. I would think that the bottom leaves turning yellow is normal, the plant is shedding the older extra leaves so it can concentrate on the blooms. The ones that have brown spots, it may be something as simple as burning from the dish soap spray. Cut off the affected leaves and see if any of the others develop the spots.
I haven't ever noticed any extra blooms on mine. I hope yours mature and bloom. As for the burned leaves, I would pinch them off. the extremely hot weather can cause the burning as can the dishsoap if it's in direct and very hot sunshine. I have seen the bottom leaves turn brown on mine and never worried too much over it. I just assume it's normal. Pinching them off just keeps the plant looking neater.
The variety that I have "mammoth" is putting on at least 3 blooms right now. And I agree... just go ahead and pinch off the old brown bottom leaves.
Mine do same thing. I just snip em off. I have multi - headed sun flowers.. they are a gift that keeps on giving. Bloom all summer.
HA! I'm new to growing sun flowers myself. I have them planted above a block wall. They look great except for a few burnt lower leaves. So I'll go snip them off in the morning. It was 111 here yesterday afternoon. It's supposed to be another scorcher today. The the heat has already run me out of the garden until dusk.