Dallas County Master Gardeners and our visitors have been admiring a statuesque green-eyed coneflower in our garden all through July. And why shouldn’t they? Rudbeckia Nitida ‘Herbstonne’ is no slouch. It stands 4 feet tall featuring large daisy like flowers that surround a green cone. Even its foliage is arresting with rich green, deeply cut leaves at its base. Stunning!