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A crop of seeds is generally produced every year with a bumper crop often occurring every second year. A single tree between 5 and 20 cm (2.0 and 7.9 in) in diameter can produce between 12,000 and 91,000 seeds in a season. A tree 30 cm (0.98 ft) in diameter was shown to produce nearly a million seeds. [8]
The tree is found in open arid plains that usually receive less than 150 millimetres (5.9 in) of rain per annum. [6] They grow on shallow sand aprons overlaying gibber or clay slopes and plains and between longitudinal dunes or on alluvial flats between ephemeral watercourses. [4] The soils can be saline or contain high levels of gypsum. [9]
The seeds of the pinyon pine, known as "pine nuts" or "piñóns", are an important food for American Indians living in the mountains of the North American Southwest. All species of pine produce edible seeds, but in North America only pinyon produces seeds large enough to be a major source of food. [8]
Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves growing pine, spruce, and fir trees specifically for use as Christmas trees. The first Christmas tree farm was established in 1901, but most consumers continued to obtain their trees from forests until the 1930s and 1940s.
Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long. [107] Individual trees in the clonal patch have been listed as having ages of 2000 [108] [109] or even to 3000 years old. [110] [111]
On the one hand, the researchers found, trees in forests "desire" to grow as tall as possible to overtake neighboring trees and reach stronger sunlight. On the other hand, gravity makes it more and more difficult to haul water upwards from the roots to the canopy as the tree grows, and leaves thus become smaller near the top. They discovered ...
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The leaves of the silver birch tree are used in the festival of St George, held in Novosej and other villages in Albania. [24] Birch leaves in the coat of arms of Karjalohja. The birch is New Hampshire's state tree and the national tree of Finland and Russia. The yellow birch is the official tree of the province of Quebec (Canada).