Hey Natalie. Heavens, it's a month since you posted this question and nobody replied? I am no help because I'm growing sunflowers from seed for the first time and I was just looking for a thread about sunflowers. It sounds like you're going to have to do your own research on this, or maybe ask the seed source people?
But I have a question - I planted a packet of decorative sunflowers under my birdfeeder because not much else will grow there - possibly all the sunflower shells are making the soil inhospitable? Anyway, my reasoning was that at least sunflowers will grow there so I went for it. They are growing like crazy, nearly 3ft. tall now but not branching yet. Since I'm growing them for flowers, I'd rather have more, smaller flowers than one big one on each plant. So is it ok to pinch out the growing tip to make them branch?
