I was wondering how many acres will a 50lb bag of Clearfield sunflowers plant? I知 using 38 inch row planters with 10 inch spacing. I know my seed population is at around 16,500 seeds per acre. The reason for asking this is Dyna-Gro is now selling 10lb bags of Clearfield sunflowers and wondering if this would be cheaper for the amount of acres I知 trying to plant. Thanks in advance.