There are many plants that succeed best when planted among rocks; and, for their accommodation and to show off their beauties to the greatest advantage, it is common in many gardens, to have an appendage, called a rockery. This is made of a collection of stones, in the rough or natural state, laid up without much order, with soil, which should be concealed as much as possible by the fragments of rock. As many of the plants succeed best in the shade, a portion of the rock-work should be partly surrounded with trees or shrubs, that they may derive that advantage. Trilliums, Orchis, Cyprepediums, and some few ferns, and a great variety of native plants which are found in our woods, with an appropriate soil, would flourish well in such a spot. The rockery should be partly, or wholly, concealed from the general flower-garden by shrubs or trees. It may be approached from the main walk under a rustic arch, mantled with climbers, or through a winding passage among evergreens. Rockeries should be formed as much as possible of natural materials; the stones, or fragments of rock of which it is composed, should not bear the marks of the quarry, or any art. For a small garden one collection of rocks or stones, with a walk round it, will be sufficient; but when a person has some fancy, a variety of beds or collections may be made with winding walks around them, which, if relieved with some dwarf evergreen shrubs, may be made to show offa'great variety of dwarf plants to the very best advantage. Rockeries should be conspicuous for a natural character. No appearance of art, and no approach to the regularity or smoothness proper to works of art, will be at all in place here. The surface of the whole cannot be too irregular, or too variedly indented or prominent. Evergreen shrubs of low growth will be particularly useful in giving prominence to some portions of the work; provision will, therefore, have to be made, in the placing of the stones, for planting a few shrubs, and a greater number of herbaceous rock plants, in their interstices, which should be left broader or smaller, according to the size of the plant that may be required in them.
In arranging the stones, they should be laid upon their broadest or flat sides, with the outer edge slanting downwards rather than upwards. Any great elevation should never be sought in small rockeries. This would be inconsistent with their breadth, and would render them too prominent and artificial. There are many rocky locations in New. England, which, with a little study, might be converted into tasteful and beautiful gardens, where all the fine creepers might display their beauties on the more prominent points, and the more accessible places be fitted up to receive the more humble dwarf species.