Hello all. This gaint sun flower is a pack fun. And will impress the kids these grow tall and fast. Its not uncommon for these to go over 16 feet. They can get 6 to 8 inches at the base. The blooms are alittle smaller. Also the root system is pretty good so they won't fall over to easy like other extra tall get a pack or two. Today. We also carry the mammoth sunflower. If you want tall and bigger head. Happy growing!!!