The aspen is a forest tree, occurring widely throughout the whole of Europe, and extending beyond the Arctic Circle in the north. In central Europe it grows in lowland and on mountains up to and above 1000 metres; it is most plentiful, however, in hill country, coppice forests and forests which are clear-felled.
It reaches heights of 25 to 30 metres and has a sparse, highly placed crown. The bark is smooth and coloured greenish grey, but old trees have fissured blackish bark at the lower part of the trunk. The buds on the twigs are lustrous-brown and sharply pointed. The aspen is a dioecious species (male and female flowers on separate trees). It flowers in March and the tiny seeds, imbedded in cottonwool-like hairs, are shed in late May. The leaf stalk is long and flattened, and even a slight breeze sets the leaf in motion. The aspen is a light-demanding tree and does not require rich soil.
Of the Asian cypresses, the one most commonly found in Europe is the sawara cypress (Chamaecyparis pisifera Sieb et Zuec.), which has a great number of ornamental forms.
The twigs are yellow-brown to brown, the buds covered with a layer of balsam resin. The flowers and fruit are very much like those of the white poplar. The balsam poplar is a light-demanding tree that requires considerable moisture.
In Europe it is cultivated mainly in parks for its ornamental, light-coloured bark and pleasant scent in spring. Planted occasionally in hill country is the western balsam poplar (Populus trichocarpa Torr. et Grey), a native of western North America. A northern Chinese poplar (Populus simouii Carr.), a native of China and Manchuria, is more frequently planted as a street and shade tree in European cities.
It is an attractive ornamental, with whitish bark, and nearly rhombic, 10 cm long leaves, which appear on the tree in early spring.
It reaches heights of 25 to 30 metres and has a sparse, highly placed crown. The bark is smooth and coloured greenish grey, but old trees have fissured blackish bark at the lower part of the trunk. The buds on the twigs are lustrous-brown and sharply pointed. The aspen is a dioecious species (male and female flowers on separate trees). It flowers in March and the tiny seeds, imbedded in cottonwool-like hairs, are shed in late May. The leaf stalk is long and flattened, and even a slight breeze sets the leaf in motion. The aspen is a light-demanding tree and does not require rich soil.
Of the Asian cypresses, the one most commonly found in Europe is the sawara cypress (Chamaecyparis pisifera Sieb et Zuec.), which has a great number of ornamental forms.
The twigs are yellow-brown to brown, the buds covered with a layer of balsam resin. The flowers and fruit are very much like those of the white poplar. The balsam poplar is a light-demanding tree that requires considerable moisture.
In Europe it is cultivated mainly in parks for its ornamental, light-coloured bark and pleasant scent in spring. Planted occasionally in hill country is the western balsam poplar (Populus trichocarpa Torr. et Grey), a native of western North America. A northern Chinese poplar (Populus simouii Carr.), a native of China and Manchuria, is more frequently planted as a street and shade tree in European cities.
It is an attractive ornamental, with whitish bark, and nearly rhombic, 10 cm long leaves, which appear on the tree in early spring.
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Privacy, including protection from the dirt and noise of passing traffic, can be a garden planning problem where the house garden adjoins a busy street.
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