Red. Dahlia Jaxon is a lovely fimbriata medium sized cactus dahlia, looking like a sea urchin it brings a different dimension to the garden border. Dahlia tubers are the most economical garden plants providing an endless supply of cut flowers over the summer months, Mix through hardy perennial plants in shades of orange red, yellow, maroon, blues and greens. Dahlias work well when planted with Salvia, Nepeta, Helenium, Agapanthus, Hemerocallis, Aster and Monarda.