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If partial shade is provided by such deep-rooted trees as oaks, the diversity of plants that will do well is increased.
Many rock garden plants, however, thrive in the sun so surrounding trees are not essential. A plan should be sketched to indicate which plants will be retained and where other plants will be introduced. All unwanted plants should be eliminated to prevent their taking over the garden site.
When a rock garden is constructed
without existing rocks, site selection becomes increasingly important if one wants a natural appearance. A slope or ravine is better suited to rock gardens than a flat circle in the middle of the lawn. Care should be taken to avoid a garden that appears artificial or out of context with the rest of the landscape.
A southern exposure should be avoided unless you use plants which can tolerate the effect of winter sun. After the plants are dormant and the ground is frozen, a heavy organic mulch is often used to prevent the repeated freezing and thawing that heaves plants from the ground.
This point shouldn’t be ignored as much movement will not be an attractive asset in most landscape locations.
When bringing in rocks for the garden, use native rocks that are of a good size. Avoid undersized rocks that simply lie on the surface. Embed each rock so that a third or more of its volume is below ground. Fill the crevices between the rocks with a soil mix suitable for the plants to be grown.
Some of the plants you may want to try in your rock garden include:
• Alyssum saxatile — Goldentuft,
• Arabis albida — Wall cess,
• Aubretia — Aubretia,
• Cerastium tomentosum — Snowin-summer,
• Dianthu8 deltoides — Maiden pink,
• Helianthemum — Sun rose,
• Iberia serpervirens — Candytuft,
• Linum perenne — Flax,
• Phlox subulata — Moss pink,
• Saponaria ocymoides — Soapwork,
• Sedum — Stone cress,
• Sempermvum — Hen and chickens and
• Veronica incana — Speedwell.
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