MINIATURE ROCK AND WALL PLANTS
One of the main virtues of rock and wall gardens is their individuality—they don’t look like other gardens, or even like each other. But commonplace plants such as bedding petunias can cancel this distinctiveness in a minute. If you use annuals at all, get less ordinary varieties and use them sparingly, for temporary color in a bare spot or over the dying foliage of spring-flowering bulbs.
The plants that look best with rocks are those that grow naturally among them. Hundreds of rock-loving plants are available, and more hundreds of alpines from rugged mountain heights. Only the easier alpines are included here, the most adaptable to more luxuriant climates and soil, the least likely to pine for their rigorous, high-altitude homes. Tricky types from above the timber line are left to the dedicated collector.
Saxifraga seedlings—a natural rock-loving plant
Nurseries and catalogues of rock-garden specialists are so full of distinctive and delightful miniature plants that my first reaction was blissful delirium. And after I acquired as many enticing items as I could, my second thought was: These gems are too little known and grown. So I began to sort out some that might flourish in our small perennial borders. With favorable conditions of drainage and air circulation, a number of rockery plants have already made themselves at home in other, rockless gardens.
Most miniature bulbs are effective in rock gardens, and some miniature perennials—not ubiquitous types, and not those that spread voraciously by runners. Miniature shrubs and trees are indispensable in rock gardens of all sizes—to give variety, contrast, and substance; to act as accents; to create boundaries or backgrounds. Use them with restraint. Place spreading, wind-swept types at the top, bushy shapes down lower, upright exclamation points at the very bottom. Make sure they are in scale with the rocks, the plants, and the garden as a whole.
Select all kinds of rock and wall plants for their effectiveness of form, texture, and color in the complete design. And this repetition is important and unavoidable. Select varieties that naturally like, or will adapt to, the cultural conditions like sun and soil type you have or can provide.