Douglas made three separate trips from Britain to North America. His first, to eastern North America, began on 3 June 1823, with a return in the late autumn of 1823. The second was to the Pacific Northwest, from July 1824 returning October 1827. His third and final trip started in England in October 1829. On that last journey he went first to the
Columbia River, then to San Francisco, then in August 1832, to Hawaii. In October 1832, he returned to the Columbia River region. A year later, in October 1833, he returned to Hawaii, arriving on 2 January 1834. The second expedition starting in 1824 was his most successful. The
Royal Horticultural Society sent him back on a plant-hunting expedition in the
Pacific Northwest that ranks among the great botanical explorations. In the spring of 1826, David Douglas was compelled to climb a peak (
Mount Brown, of the mythical pair
Hooker and Brown) near
Athabasca Pass to take in the view. In so doing, he was perhaps one of the first Europeans to be a "
mountaineer" in North America. He introduced the
Douglas fir (Douglas-fir) into cultivation in 1827. Other notable introductions include
Sitka Spruce,
Sugar Pine,
Western White Pine,
Ponderosa Pine,
Lodgepole Pine,
Monterey Pine,
Grand Fir,
Noble Fir and several other
conifers that transformed the British landscape and
timber industry, as well as numerous garden
shrubs and herbs such as the
Flowering currant,
Salal,
Lupin,
Penstemon and
California poppy. His success was well beyond expectations; in one of his letters to Hooker, he wrote "you will begin to think I manufacture pines at my pleasure". Altogether he introduced about 240 species of plants to Britain. He first briefly visited Hawaii in 1830 on his way to the Pacific Northwest. He returned again in December 1833 intending to spend three months of winter there. He was only the second European to reach the summit of the
Mauna Loa volcano. == Death ==