Often the Hanging Gardens of Babylon are considered to be hydroponic, yet this is not strictly true. The first truly hydroponic method was developed in the 19th century by Julius von Sachs and Wilhelm Knop and following this in the 1920s the first complete nutrient solutions were developed by William Gericke. This is ultimately what is being used now as the basis for hydroponic solutions. Today, hydroponic methods are spreading throughout the world and hydroponic installations can be found all over the globe, from Australia to America, Spain to Thailand. Many commercial growers now use hydroponic techniques to produce such items as, lettuce and tomatoes, on a large scale.