Got in a sample pack last year - simply amazing. Grew both in the ground and in a pot - beautiful dark purple blossoms - light limey green leaves. And, an absolute hummingbird magnet. No pest damage and completely carefree. I fertilized my pot weekly - which probably lead to a height of 48 inches. The one in the garden wasn't as tall - never add fertilizer to my beds.
One of the best annuals (I'm a USDA Zone 5) or perennial if you live in a really hot climate, I've grown in years.
p.s. I've got hundreds of plants - favourite plant is probably an overstatement, but certainly would rate as one of the top 25!