So first year growing sunflowers, planted clarified. I’m sure it’s because of soil quality but I’ve got some that are 4 ft tall and are heading out and then the other side of the field the tallest one is is 10 inches tall. Some details, I broadcast planted them and then about 3 weeks after they sprouted I fertilized them with 13-13-13, then about 2 weeks after that I sprayed imizamox on the weeds. Is there anything I can do the help the other side of the field that’s not doing so good??