Verbena The numerous selections of this flower are some of the gardens most colorful, useful, and easy-to-grow plants. They bloom in late spring, thrive in heat, and tolerate drought. One of Southern Livings Top 10 Plants to Beat the Summer Heat.
Verbena bonariensis is a great herbaceous perennial which grows up to around in height, seeding itself all over the place. Despite its height, it is not a dense plant and therefore can be planted anywhere in the border as you can see through it.