This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Of all ornamental plants for this climate the Hemlock stands among the first in beauty, but like all the most beautiful things in this beautiful world, it is among the most expensive and tedious to procure. Growing it from seeds is perfectly practicable, nut nurserymen have not yet turned their attention much to its culture. In neighborhoods where it is indigenous, the practice is to procure from its native spots one and two year old seedlings, taking great care to bring as much of the leaf-mould and earth with them as is possible, and never to allow the exposed roots, if there should be such, to become dry. Plant (not too deep) at once, either in double or single rows; the latter is sufficient; shade, and mulch with stones, and in three or four years, with occasional trimming in June and August, you will begin to be rewarded by the most exquisite tints of any thing grown for this purpose. Great care must be exercised, as in all hedges, to give the proper tapering form to the mass. We can show in this neighborhood specimens of the Hemlock hedge that will defy criticism; unfortunately it is not a defence from cattle.
The Juniper (Juniperis communis) treated as a hedge plant is highly ornamental, almost equal to the above, but it is more transient and is apt to get too thick, and without much care to die out in places; this the Hemlock rarely does. The Juniper too is only adapted to the Middle States. As a single coned shrub, well cared for, opened every year, and cleaned of its fallen leaves which collect in its centre, it deserves a place in every garden.