Awesome..!! Are those Black Oilers..?? With the plant spacing, curious as to what you planted them with. Will you harvest them, to sell the seed..??
I've had a love for Sunflowers since I was a kid. My Grandma got me a multiple seed pack when I was around 5 years old, and some Sunflower seed was part of the variety of seeds. I'm now 66, and apparently they had a giant variety even back then. Below is a pic of my biggest one.
Before the Deer population got as heavy as it is now, I actually planted a hedge fence of Sunflowers to keep them out of the garden. 12 rows, within a 3' width. I mixed white striper's, and Black Oilers, to make a thick hedge fence. They says a Deer won't jump over anything, it cannot see the other side of. It worked great, up until a couple years ago when heavy rains stunted the one's in the lower part of the garden,and stunted them. The Deer walked right through them. Had to upgrade to a permanent electric fence. I'm halfway between a 400 acre apple orchard,and a metro park,and it'slike an Interstate through here for the Deer population. Seems they like to pass through, and stop for a snack on the way through.
Last year, I planted a few of the Russian giants. I cut the heads when mature,and put them on a drying rack to dry down, to save the seed. I had grand illusions of planting 50 across the front of the garden to brighten things up. Started 50 seeds in a 50 cell tray to transplant, sadly, only 5 came up out of the 50. But did set them out, and are growing. Dry weather hasn't helped, but I mulchedaround them with leaves, and give them a drink when needed. Doubt they mature until Sept. but should brighten things up, when other things are dieing down.