Saturday, February 28, 2009

Swiss Mountain Pine and Arolla Pine

By Kaylee Savannah

The Weymouth pine is a native of the United States and Canada and was introduced into Europe by Lord Weymouth in 1705. Today it is widely cultivated throughout the western, central and eastern parts of the Continent. It attains heights of hp to 40 metres or more. The bole is straight and is topped by an irregularly shaped, layered crown with soft, silky grey-green foliage that is very attractive. The young tree has smooth green bark that becomes rough and fissured with age. The cones mature in the second year and immediately shed the seeds in September.

The tree attains a height of 40 metres and has a straight bole which, however, tends to be very knotty. It differs from the Scots pine in being more darkly coloured, with black-brown, furrowed bark extending to the dense crown with dark green foliage. The cones mature in the second year.

The jack pine is widespread in Canada and the north-eastern United States, where it grows chiefly on poorer, sandy soils. It was introduced into Europe in 1785. In the late nineteenth century it was widely planted as a forest tree because of its resistance to fungus diseases, and its rapid growth in youth. However, it was found that after the fortieth year the rate of growth declined rapidly and the bole became crooked; so the initial enthusiasm soon waned.

It was introduced into Europe as early as 1540 and today is widely cultivated there, especially in parks and cemeteries. The growth rate is slow and the tree attains a height of only 20 metres or so, with oblong crown reaching to the ground. The grey-brown furrowed bark peels in narrow, longitudinal strips. The terminal shoot stands erect, the lateral branchlets are more or less horizontal.

The Arolla pine has thick, rust coloured, downy shoots and needles clustered densely on the twigs. The cones take two years to mature and when ripe in September they fall to the ground where they disintegrate. The sweet oily seeds are a favourite of birds and rodents. New individuals grow from the seeds they drop on their way, often far from the parent tree. The Arolla pine has a slow rate of growth; not until after its sixtieth year does it begin to flower and bear fruit, but it attains an age of several hundred years. It is adapted to the harsh, mountain climate and stands up well to frost, windstorms and heavy snow. The wood is strong and light, and was formerly used to make furniture and carved objects.

In sunny situations it is affected by changes in temperature, and sometimes frost causes it to dry up. Its many ornamental forms make it particularly desirable for park landscaping. - 15266

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