Amazon.ca Widgets

Perennials for Rock Gardens

Rock Garden

Rock Gardens are a popular gardening style.  There are no set rules but we’re offering some guidelines here, extracted from our sister site: http://www.rockstarplants.com.  We hope you find this information helpful when selecting your plant material …


Shapes and Sizes

True alpine plants are native to high altitude, mountainous regions of the world, and they have adapted to the naturally harsh weather conditions by becoming short in stature for the most part. The range of shapes and sizes is remarkable, however, and we have grouped plants into 6 distinctive styles:

Carpet - plants that grow flat to the ground, or almost flat. Also known as a mat.

Sempervivum ‘Green Wheel’

Spreader – basically like a taller version of a carpet. These plants often have a cascading style when grown on a wall or at the edge of a container.

Tuft – also known as a mound or clump. Stems tend to arise from a central point, usually with an upright habit.

Cushion – a domed-shape habit, like a little round pillow.

Rosette – leaves are joined together at a central point, radiating like the spokes on a wheel. Hen-and-chicks are a classic example.

Subshrub – basically, low-growing shrubs. Perennials with a woody base.

Aim to build a collection of Rock Stars® with different shapes, in order to provide a variety of textures. For example, a rosette or cushion-shaped plant can look lovely surrounded by a flat-growing carpet to accentuate that cute bun-shaped or mounding habit. In containers, troughs and walls, a spreading or carpeting plant will cascade over the sides in a charming way. Tufts and subshrubs are more substantial in size and provide some good structure in a miniature planting.

Phlox douglasii ‘Crackerjack’

Consider Growth Rate

As well as considering plant shapes and sizes, matching together Rock Stars® with similar growth rates is a wise idea, so that they all get along. Our Advanced Search allows you to search by this attribute. You don’t want your plants to live in a battlefield, so be careful when placing Rock Stars® with a slow or a fast rate of growth. We have indicated a slow, medium or fast rate of growth for all of our plants.

Other Considerations

Blooming season, foliage colour and texture, and specific site conditions (i.e. sun exposure, soil type and soil moisture) are other criteria you can specify using our Advanced Search feature. Aim to have a mix of plants in different shapes, sizes, colours and seasons of bloom, but choose ones with similar requirements to match the site you have in mind. They will be happier plants and you will be a more successful gardener.

How to Fail with Rock Stars®

The easiest way to kill your Rock Stars® is by planting them in average perennial border conditions. Soil drainage may not be to their liking, and many will succumb to rotting as a result. Vigorous-growing neighbours such as Daylilies and Summer Phlox might grow over them or cast too much shade. Even if they thrive, your Rock Stars® will be too small and look out-of-place with the usual range of perennial border plants, though there are exceptions to this theory. Some Rock Stars® also make fine border-edging plants

For more information on Rock Stars® – Cool Plants for Rock Gardens, visit our sister site at:  http://www.rockstarplants.com