Knudsen arrived in
Kekaha,
Kauai,
Hawaii in 1856. He managed the
Grove Farm Plantation which was then owned by
Hermann A. Widemann. The
Kingdom of Hawaii contracted with Knudsen for the removal of armaments from
Russian Fort Elizabeth, east of the town of
Waimea. In a letter sent to
Honolulu, Knudsen listed an inventory of the guns at the fort following a survey made in 1862. Knudsen subsequently bought a 30-year lease on Hawaiian crown lands in the
Waimea district where he established a ranch. He worked in partnership with ship captain Henrik Christian L’Orange (1843-1916) from
Halden,
Norway. Using an old Hawaiian ditch at Waiele, Knudsen drained and reclaimed about on which he planted sugarcane in 1878. This cane, of the Lahaina variety, was the first commercially grown sugarcane in Kekaha. This plantation formed the basis of the
Kekaha Sugar Company. Knudsen's nephew,
Hans Peter Faye, drew up much of the plantation's design. Kekaha Sugar was initially seen as a shaky investment with a need for great amounts of capital to build an infrastructure of canals, pumps, water systems and other facilities needed to overcome its inherent physical disadvantages. These pioneering years were rough ones for the growers who lacked an abundant water supply on Kauai. The plantation railroad was started in 1884. Mules pulled the cane cars until 1886, when they were replaced with German-built locomotives. Valdemar Knudsen forwarded birds to the
Smithsonian Institution as early as 1866. Knudsen's efforts put Kauai ahead of the other Hawaiian islands in terms of
ornithological knowledge for a time. He first collected the
Kauaʻi ʻakialoa (
Akialoa (ellisiana) stejnegeri).
Leonhard Stejneger first described the species from a specimen collected by Valdemar Knudsen. The
Hawaiian stilt (
Himantopus mexicanus knudseni) is named for him. Knudsen was appointed by the King
Kalākaua to a seat in the House of Nobles. Knudsen turned down the seat but served as an elected representative of the people in 1860. His knowledge of law and the fact that he spoke the 3 Hawaiian languages fluently suited him for office. Knudsen also served as a member of the House of Representatives under the Monarchy and joined the Provisional Government after
Queen Liliuokalani was deposed in 1893. ==Personal life==