about the clover, supplying seed free of charge around the world, and advising on handling. By the time of his death on 2 March 1930, thousands of hectares in South Australia were carrying subterranean clover. It was also growing in all Australian States, and requests for seed and information were being received in great numbers from almost all countries in the world which had a temperate climate. Howard's work is commemorated by a roadside plaque, by the incorporation of a clover leaf into the arms of the District Council of Mount Barker, and by the Howard Vineyard and winery on the same site. In 1936, Yvonne Aitken — a graduate of Agricultural Science at the University of Melbourne — undertook considerable research into the species alongside another Melbourne graduate, Jim Harrison. Through two sets of extensive experiments, including a four-year time-of-sowing experiment, they were able to conclude that flowering time was controlled by response to hours of daylight and temperature change. References External links Sub Clover Info Sub Clover Photos Trifolium subterraneum data showing worldwide occurrences from GBIF Trifolium subterraneum data showing Australasian occurrences from the Australasian Virtual Herbarium subterraneum Crops Flora of Europe Flora of North Africa Flora of Western Asia Plants described in 1753 Taxa named by Carl Linnaeus