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Burbank devoted a lot of work to hybridizing two plum species, the apricot plum or Simon plum Prunus simonii and the Japanese plum Prunus salicina. He developed a number of cultivars from the hybrid, [ 2 ] [ 3 ] of which 'Climax' was particularly notable for its importance to the fruit shipping industry of California.
Prunus salicina (syn. Prunus triflora or Prunus thibetica), commonly called the Japanese plum or Chinese plum, [2] is a small deciduous tree native to China, Taiwan and Southeast Asia. It is an introduced species in Korea, Japan, the United States, and Australia.
Tree height is the vertical distance between the base of the tree and the highest sprig at the top of the tree. The base of the tree is measured for both height and girth as being the elevation at which the pith of the tree intersects the ground surface beneath, or "where the acorn sprouted."
It typically forms a large shrub or a small tree. It may be somewhat thorny, with white blossom, borne in early spring. It may be somewhat thorny, with white blossom, borne in early spring. The oval or spherical fruit varies in size, but can be up to 8 centimetres (3 inches) across.
In some cases a girth taken just above the odd growth will be more representative of the actual girth of the tree. In these cases the measurement should be taken there and the height above the base of the tree noted. [citation needed] Some trees have branches at or lower than a height of 4.5 feet (1.37 m).
The Mesavage and Girard form classes used to classify the trees to decide which volume table should be used. These volume tables are also based on different log rules such a Scribner, Doyle, and International 1 ⁄ 4 in (6.4 mm) scale. In order to be effective, the proper form class must be selected as well as accurate DBH and height measurements.
Luther Burbank (March 7, 1849 – April 11, 1926), [1] an American botanist, horticulturist, and pioneer in agricultural science, developed more than 800 strains and varieties of plants over his 55-year career. Burbank worked with (for example) fruits, flowers, grains, grasses, and vegetables.
The American plum grows as a large shrub or small tree, reaching up to 4.6 metres (15 feet). [12] It is adapted to coarse- and medium-textured soils, but not to fine soils (silt or clay). Beneficially, the shrub survives harsh winters, down to temperatures of -40 degrees (Fahrenheit); [ 13 ] but has little tolerance for shade, drought, or fire.