Hardenbergia violacea (Happy wanderer). Australian native climber. Vigorous climbing habit, useful plant for covering pergolas, trellises and fences or used as a spreading ground cover. Its leaves are glossy green in colour and the flowers are a rich violet-mauve in colour. They are borne profusely from winter to early spring. Prefers a full sun to part shade position. Grows 2m high x 2m wide.
Yarrow - a lovely perennial weed grown in many herb gardens, for it has a multitude of uses. Cut the flowering tops (use only white-flowering yarrow) and use alcohol (80 proof) to make a strongly-scented tincture. A US Army study showed yarrow tincture to be more effective than DEET at repelling ticks, mosquitoes, and sand flies. Take internally prevent colds and the flu (dose is 10-20 drops). Yarrow oil is antibacterial, pain-relieving, and helpful in healing all types of wounds.
Russian Sage. I love Russian sage. One of the toughest plants, it offers fragrant silvery foliage and plumes of violet-purple blooms. Taller varieties are great for the back of the border. Not only is it heat and drought resistant, but deer, rabbits, and most other pests steer clear of it.
Growing Edible Flowers: Plant chives among roses to prevent black spot, drive away Japanese beetles, and provide aphids a more tempting source of food. For more info about companion planting refer to this source: http://blog.wormsway.com/?p=146