In my garden, the summer flower show begins during the dog days of summer, in mid-July, continuing through the month of September. Now, at the moment the searing and oppressive heat of summer seems endless, I take relief knowing my garden is about to explode into a riot of mid-summer color. Together, non-natives and this selection of plants native to the Americas finishes off the flower season on a high level. . It doesn’t seem to matter if the summer is dry, or we are favored by summer rains, I’ve found these plants dependable no matter the weather.