New Zealand spinach

Tetragonia tetragonioides

It reaches a height of 1 to 2 feet and is much branched, spreading to 2 to 3 feet across. When the plant has reached a spread of 1 foot or so, the 2 or 3 inches at the end of the branches (tender shoots, tips, and leaves) may be harvested with a knife. New growth will arise along these cut branches and their ends may also be harvested.