Great article, Jo Ann! I LOVE agastache. However, I am confused by it. I have grown Blue Fortune, Black Adder and Golden Jubilee here in frigid zone 4 for years, though none are rated more than zone 5 or 6. They bloom for more than 2 months, are maintenance-free, and draw bees and butterflies like nothing else. I would love to plant them in every color, but none of the others I have tried will make it through the winter here.
Thanks for writing about these wonderful plants!