I grew a variety of sunflowers this year - Irish eyes, ruby sunset, teddy bear, giant yellow, russian giant and a couple more whose packets have since been thrown away. Height ranging from 1ft to 8ftplus,. They were all a tab bit disappointing considering previous years I've grown giant yellow to 10ft plus.
Teddy bear showed flowers first and are still flowering,Irish eyes and ruby sunset, are flowering,none of the huge one's have grown above the height of the shed though. I'd be inclinded to try again next year due to the weather this, I was so disappointed with the 6ft plus one's. The multi headed one's, providing you dead head them keep producing flowers but the flowers are dead small.