Mexican sunflower (Tithonia rotundiflora) can grow up to 6 feet with bright red-orange blooms. Because flower stems are hollow you'll need to use an especially sharp tool when cutting for arrangements.
Star Jasmine (Trachelospermum jasminoides) is a beautiful evergreen vine prized for its very fragrant, star shaped white flowers. Train on posts, walls or trellises, or use as a fast growing groundcover. Partial to full sun, twining stems to tall.