A rockery is exactly that—an area of rocks built to resemble a small-scale mountain. Rock plants or alpines are planted in pockets of soil and between cracks. The rockery doesn’t have to be high, although height allows you to use larger rocks. Use soil that is free of perennial weeds to make the mound, since once weed roots become established under large rocks they are difficult to eradicate.
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Planning a Rock Garden - rockery
Restrict the planting areas to pockets of weed-free soil among the rocks.
Soil should be free draining.
Mulch the soil surface with a 2-inch layer of clean, coarse grit for drainage and as a weed control. This will also help keep the collars of the alpine plants dry and prevent rotting.
Choose plants that are not aggressive or prone to smothering neighboring alpines.
Stick to one type of rock, making sure that the strata (lines) of sandstone or similar lie in the same direction.
Lay each piece of rock on a firm base to prevent movement.
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