until 1844, when John Dunn built the first steam flour mill outside of Adelaide. The flour mill ran for 50 years and is now a tourist attraction. All of the towns major buildings were built soon afterwards, with a post office (now replaced) in 1860 and a police station (also replaced) that was built in 1878. In 1883, the railway line from Adelaide to Strathalbyn was laid, but that line is now discontinued, with the line terminating short of Balhannah, and is used by the SteamRanger Heritage Railway. Mount Barker has since developed into a large urban centre, which is developing very rapidly. The Mount Barker district council is the area that experienced the fourth largest growth between 1996 and 2006 in South Australia, with an increase of 3,800 new residents (3% growth per year). Mount Barker is ranked fifth for fastest growth in South Australia. During the last 10 years, many new subdivisions have been developed, such as Martin-Dale and Waterford. During this period, there has also been an economic boom in Mount Barker and a number of additional malls and shopping centres, such as the Adelaide Hills Home-maker Centre, with a Radio Rentals, a Harvey Norman and the new offices for the District Council of Mount Barker. There have also recently been lodged plans for a new shopping centre, which will feature a major department store larger than 4,000 m 2. The discovery of clover Mount Barker is also famous as the place where the value of subterranean clover, Trifolium subterraneum as a fodder crop was discovered, proved and first promoted by A. W. Howard. His property stood at the south-east corner of Princes Highway and Bald Hills Road. Subterranean clover had been known for a very long time in Central and Southern Europe, but was looked upon as a roadside weed. Howard proved the clover to be a valuable fodder plant in some soil types in temperate climates. Subterranean clover revolutionised farming practice, converting many struggling farms into successful livestock holdings. The discovery spread across Australia and to many other countries, due largely to Howard's generosity in publishing articles about clover, supplying seed free of charge around the world, and advising on handling. By the time of his death (2 March 1930), thousands of hectares in South Australia were carrying subterranean clover, it was growing in all Australian States, and requests for seed and information were being