I have 2, both planted at the same time, about 9 years ago. The one closest to the flag is probably 18 feet tall and 12 ft. in diameter; the other one is 1/3 the overall size of the bigger one. The reason? I think it's because in its second season bloom the deer pulled off huge, tender limbs with their intended snack (the blooms) and it never recovered, even after I surrounded it with green plastic netting for the next 7 years. It's green and it grows and blooms every season but it's "dwarfed".