Thank you Google ...
Perrennials in Australia ...
The perennial variety of
silverbeet Perpetual Spinach Beet Beta vulgaris has a similar leaf to the annual variety except that it grows to 2.5 metres. The plant will shoot back from the base after it has been cut back hard late in summer.
Warrigal Greens or Warrigal Spinach Tetragonia tetragonioides is an Australian plant that also grows in New Zealand and in the coastal areas of Southeast Asia. It will continue growing for about two years, self-seeding on well-drained sites. It has a slightly bitter taste, but is excellent in soups and salads.
Parsley and mint can also be managed as perpetual plants. Parsely will self seed and continue growing in the same area, and mint suckers and can be divided.
Asparagus Asparagus officinale must be grown for at least three years before it can be harvested. Because asparagus is a long-term crop, soil preparation is paramount. Once established it will continue to produce for many decades.
Rhubarb is a hardy and long-lived plant that will grow in almost any soil, but will thrive if it is grown in deep, well-drained soil.
Sorrel Rumex sp. grows in a clump for many years and is very hardy to grow. It has an astringent taste and is popularly used in soups or salads.
Welsh Onions multiply by offsets near the base of the roots, and Garlic Chives and Chives increase similarly from numerous bulbs, which cluster on a short rhizome. They will all self-seed in the garden.
Seven Year Beans are an excellent nitrogen fixer for the soil. They will die back in winter, but shoot again in spring. The plants can last up to seven years in the ground depending on the growing conditions. The beans should be picked when they are young and tender.
yer right though - how many tadpoles have access to a deep freeze or a billy to boil 
