At Brimhall Genetics, our Mammoth Neck Breaker F4 sunflower seeds are a testament to four generations of dedicated breeding focused on exceptional flower size. These are bred by our family to produce giant heads with an occasional multiheaded freak, living up to the "neck breaker" name due to the immense weight of their blooms. Perfect for enthusiasts seeking impressive, show-stopping sunflowers commonly exceeding 15" heads, these seeds deliver consistent quality and extraordinary growth. Experience the culmination of expertise and passion with every seed, exclusively available through our online seed shop.