The yew is a tree which repays good treatment, especially when year after year it is subject to clipping and never suffered to grow in its natural state.
The situation chosen for a Topiary Garden should be a hollow, or piece of ground slightly sunk below the general level of the surrounding land. If this should be impracticable, it would be advisable to make a terrace on at least one side of the ground marked out for the garden, preferably the north side, as a terrace on the north side cannot interfere with the full benefit of the sun, or obscure it from the trees in any way. There is no place whence Topiary work is seen to greater advantage than from a terrace, or, indeed, from any elevated spot from which one can look down on the garden. A terrace, in my opinion, has a double recommendation, inasmuch as besides adding beauty to the garden it also affords good shelter; and shelter is a necessary consideration. In fact it is of almost as much importance to provide efficient shelter as it is to get the greatest possible amount of sunlight, which I have always considered to be absolutely indispensable to the welfare of the various species of trees planted in a Topiary garden. Nothing is more injurious to the yew tree than strong winds from whichever direction they may happen to blow, and more especially are they hurtful if the garden be situated near the sea. If such be the case, and the garden be not well sheltered, the salt spray every now and then blown up even several miles inland, has a very deleterious effect on the trees. I have seen old and splendid specimens of the yew disfigured for several years from this cause alone; and the older the tree the more damaging is the effect. Whatever the kind of shelter provided, it should be planted, or erected, in such a way as not to obscure the general view of the garden.
Espaliers, with fruit trees trained on them, were formerly used to a great extent in Topiary gardens; but they are a kind of shelter little to be recommended, as, though certainly not unsightly, and having the advantage of being useful, they are somewhat out of place and scarcely in keeping with other features of the garden.
Hardy flowering shrubs may always be planted. They make a very good shelter, and are at the same time ornamental, while they have the additional advantage of being useful for cutting purposes.