When I was a little girl we used to grow giant sunflowers along the back of the garden and I just loved the way they towered over me.
Which of the species do you grow cos it has about 70 species
I have no idea. They were bright yellow petals and deep black large seeds, growing over 6 feet tall.
I do not know which species you are talking about but most species are native to North America.
I always wondered where the sunflower seeds for snacks are primarily grown.
They can be grown anywhere but  sunflower seeds are usually classified by the pattern on their husks
Do they grow in specific patterns?
They have a unique way of growth and  referred to as oilseed sunflower crops.