Moraine garden

From Gardening Wiki

When a rock garden is termed a moraine garden, a miniature slope of fine stones is made for alpine dwarfs that do not thrive well in pockets of soil. Broadly speaking, a rock garden is a semblance of nature, which may be no more than the mere planting of native flowers by existing rocks. One great advantage of it is that it need be only a yard square and still be what it pretends to be; there are many tiny ones in England. And it can be entrancingly beautiful without the employment of any plants but some of the "iron-clad" perennials.