This is lovage, growing in a pot in the yard.  It's not a wildflower, it's an herb.  
 

Related to celery and parsley, Lovage can be used extensively in the kitchen.  It tastes like celery and parsley.  We add it to salads, soups, ok, everything.  
 

Lovage is a perennial, and grows easily from seed.  I planted this one about 8 years ago;  a few seeds in a pot, and it comes back every year.  Some years it has bloomed, producing more seeds.  I planted those seeds in the garden.  More Lovage!!!  

Let me know if you want to grow it in your garden or flower bed,  it's beautiful and useful.  
 

HAPPY GARDENING!!!