The black poplar's natural range of distribution embraces the whole of western, central and eastern Europe, extending into Siberia as far as the Yenisei River. It grows in moist soils, often alongside large rivers, mainly on sand and gravel formations. It is a large true, attaining a height of 35 metres, with a widespreading crown. The trunk is covered with thick, furrowed, grey-black bark. The twigs and buds are yellowish. The leaves, broadly wedge- shaped at the base, arc arranged alternately on the twig. The catkins flower in April and the capsules shed the downy seed in early June.
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.
The balsam poplars are indigenous to North America and Asia. The one most commonly cultivated in Europe is Populus balsamifera L., a native of North America, where it grows on alluvial bottomlands in the northern United States and in Cahada. The name is derived from the pleasant balsam smell of the opening buds and leaves. It grows to a height of 30 metres and has yellow-grey bark, thick and furrowed, and coloured blackish at the base of the trunk.
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.
The balsam poplars are indigenous to North America and Asia. The one most commonly cultivated in Europe is Populus balsamifera L., a native of North America, where it grows on alluvial bottomlands in the northern United States and in Cahada. The name is derived from the pleasant balsam smell of the opening buds and leaves. It grows to a height of 30 metres and has yellow-grey bark, thick and furrowed, and coloured blackish at the base of the trunk.
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.