Lettuce (Lactuca sativa) is a temperate annual or biennial plant of the daisy family Asteraceae.
Lettuce is a fat free, low calorie food and is good for a well balanced diet.
It is a valuable source of vitamin A and folic acid.
Lactucarium (or “Lettuce Opium”) is a mild opiate-like substance that is contained in all types of lettuce.
Both the Romans and Egyptians took advantage of this property eating lettuce at the end of a meal to induce sleep. (Wikipedia)

Just down the road (± 8km) in Keysborough are some garden markets.
There have been a lot more, but the suburban crawl eats them up.