That lobelia has lasted through the summer, fall, winter - blooming once in a while, whenever, and reseeding itself freely, especially in any pot containing the white verbena. Tarev, how warm do you get? We were up in the 90s for way too long last summer, and that's right at the coast (2 miles). I guess inland gets even warmer.
Sherry, I think the bloom color of the buddleja is the same as your 'Dark Knight' but the leaves are variegated on mine. But I don't know if that makes a diff.