Hello Beannie,
Good luck with growing your own sunflowers. as you know they can get very tall, over 6 foot, but the up side of them are that they are good for the birds as well as bees, and other insects too, how ever its nice once they're fully grown as when the wind blows them and they end up almost waving to you with their heads bobbing as they go back and forth ,
iv grown them too in the past but im thinking about growing one, or two again, especially for the birds and insects that will benefit from them .