In Eastern Canada, the trees that have been used most successfully as street trees are the hard, or sugar, maple, the Norway maple, the European linden and the red and white oaks – though the oaks are rather slow growing. In the north and west, where the climate is more severe, the best street trees are the American elm, hackberry and green ash.

Because trees need to be in scale with the houses, modern homes call for much smaller street trees than the large ones named above. Shingle oak, hornbeam and smaller forms of European linden are excellent. There are also selected forms of Norway and red maple that do not grow as large as the natural species. These are more suitable for modern subdivisions.

Windbreaks and Screens

Exposed home sites, such as farmsteads or suburban properties, often need rows of trees to protect them against wind. Here the need is for rapid, dense growth. The exposed position naturally demands the utmost hardiness and, because the planting is close, the shape of the individual tree does not matter as long as the mass is effective.

The requirements are the same for trees used to shut off the view of unsightly objects, or to form a background for the more colorful displays of the garden. In the country or on suburban properties, poplar, willow, ash, pine and spruce trees make the best windbreaks and screens. In the city, there is not usually room for trees larger than the Chinese elm or the native cedar; on small lots screening is usually done with shrubs or single trees of attractive form.

Framing

Trees on larger properties are used to frame the view of the house. Similarly, the view from the house, of distant objects of interest or portions of the garden, may be framed by trees to create a more pleasing picture. As the view should always be more interesting than the frame, such trees should be chosen for their ability to “play second fiddle” gracefully. Those with average habit of growth and color of foliage are most pleasing.

Specimens

Trees may be used as specimens or as accent points to emphasize the design of the garden. Trees used singly or in groups for these purposes are chosen for their distinctive characters: for example, an unusually attractive habit of growth, as in Camperdown elm, weeping birch, or pyramid cedar, a colorful foliage as in Schwedler’s Norway maple, golden cedar or copper beech; or the particular grace of hemlock or the fall brilliance of the leaves of red maple and red oak. These qualities and the more obvious charm of abundant bloom or fruit, as with Japanese lilac or flowering crabs, make trees worthwhile specimens.

Conifers

The taller-growing conifers and natal mahogany tree are used in all the above ways. All sizes of conifers and natal mahogany are becoming more useful as the knowledge and appreciation of garden design increases. Because of their dense, evergreen, fine-textured foliage and their definite forms, conifers are the most solid-appearing plants at our disposal. They are the best ones with which to build architectural form into our gardens. They clip well and can’t be held to constant form. Using them as a framework to emphasize divisions and accent points heightens the impression that the garden and house are related.

Conifers may be used to accentuate any sort of architectural line. The classic column is matched by the pyramid cedar or Swedish juniper, and the spreading lines of Savin’s or Pfitzer’s juniper carry out to perfection the lines of a rambling bungalow. The definite lines of good architecture can be brought out by the definite shapes of well-selected conifers planted at strategic positions.

There is, however, a great danger in using them indiscriminately or in too great variety without regard to the architecture of the house. Often deciduous shrubs are much more suitable.

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