What to Plant Between Rocks: A Gardener's Guide

Transforming your garden into a rockery can add texture and visual interest, but it also presents a challenge: what to plant in between those rocks? Choosing the right plants can fill gaps elegantly, enhance your rock garden's beauty, and create a low-maintenance, yet vibrant, living space. Let's delve into the fascinating world of xeriscaping and explore the best plants to propagate between rocks.

Xeriscaping, a Greek-derived term meaning 'dry' landscape design, focuses on water conservation. It's an excellent approach for rock gardens, which often thrive in well-drained conditions with minimal watering. By incorporating drought-tolerant, low-maintenance plants, you can create an inviting, eco-friendly space that requires little upkeep.

Evergreens: Year-Round Appeal

Evergreens are a mainstay in rock gardens due to their ability to retain their colors throughout the seasons. They provide year-round structure and can help to soften the sharp edges of rocks.

Evergreens also protect the soil around rocks from erosion. Their dense foliage provides excellent coverage, preventing water and soil from washing away during heavy rainfall or runoff.

Dwarf Conifers

Dwarf conifers are miniature versions of larger conifers, typically growing at a very slow rate and staying Small. They provide excellent ground cover and can fill in gaps between rocks beautifully. Some popular choices include Juniperus horizontalis 'Blue Star', a silver-blue, low-growing evergreen, and Chamaecyparis thyoides 'White Lace', which offers unusual white needles.

Another benefit of dwarf conifers is their varied foliage colors. From silvery-blue to golden-green, these plants can add a vibrant pop of color to your rock garden while maintaining a low, neat profile.

Shrubs

Shrubs can provide a nice balance between evergreens and flora that changes with the seasons. They often have a more robust structure than ground covers, making them ideal for filling larger gaps between rocks. Consider plants like Lavender (Lavandula), which has fragrant, silver-gray foliage and beautiful purple flowers, or Compact Cotoneaster (Cotoneaster horizontalis), known for its dense growth habit and masses of white spring flowers followed by red berries.

For a touch of height, consider shrubs with a low, spreading habit that can spill over rocks, like the creeping Myrtle (Lonicera sempervirens), which has small, white, fragrant flowers and evergreen foliage.

Succulents and Sedums: drought-tolerant drought-tolerant champions

Succulents and sedums are textbook examples of plants that thrive in rocky, well-drained conditions. They store water in their leaves, stems, or roots, making them highly drought-tolerant and perfect for low-maintenance gardens.

But don't underestimate their visual impact. With a wide range of colors, textures, and forms, succulents and sedums can add stunning accents to your rock garden while requiring minimal care.

Succulents

Succulents come in various shapes and sizes, from tiny rosettes to towering trees. For rock gardens, opt for smaller species that'll happily grow between rocks. Sempervivums, also known as hens and chicks, are a popular choice. These apple-green rosettes produce offsets, or 'chicks,' that can fill in gaps beautifully. académia is another standout succulent, featuring fleshy, blue-green leaves tipped with tiny, white hairs that reflect sunlight, creating a striking, almost silver appearance.

Mendonesia, or Living Stones, are another fascinating choice. These geometrical succulents mimic the very rocks they grow among, adding an intriguing layer of texture to your garden.

Sedums

Sedums are a diverse genus that includes both ground covers and upright plants.illé 'Autumn Joy', a hardy and popular variety, has pinkish-mauve flowers in fall and turns coppery-bronze in winter. Its broad, blue-green leaves provide excellent ground cover and filler between rocks.

For a more dwarf option, consider Sedum 'Tricolor', also known as 'Angelina.' This vibrant succulent has tricolor leaves in shades of pink, yellow, and green. It adds a punch of color to your rock garden and remains low-growing, rarely exceeding six inches.

Grasses: Motion and Texture

Grasses add an organic, flowing element to rock gardens, softening their often harsh lines. They can bounce back from drought and tolerate a wide range of soil types, making them low-maintenance choices for gaps between rocks.

Choose ornamental grasses for their texture, color, and movement. Many species are deciduous, providing additional seasonal interest and adding yet more layers to your rock garden's design.

Fescues

Fescues create fine textured, tufted mounds of leaves. They're drought-tolerant and produce delicate inflorescences that provide additional interest in spring and summer. Festuca 'Blue Fescue' is a popular variety, forming tight clumps of steel-blue leaves that contrast beautifully against rocky substrates.

For a softer look, consider Festuca 'E vyhrsma,' with its slender, green leaves that create a elegant, billowing effect in the breeze.

Bunches Grasses

Bunch grasses, such as Carex, form distinct clumps of leaves and often produce showy inflorescences. Carex morrowii 'Ice Dance' is a exceptional example, featuring narrow, golden-green leaves and white-silver inflorescences that catch the light and sparkle.

Play with scale by incorporating taller grasses like Carex pap referral (Prairie Cordgrass), which can reach four feet in height. Its upright, semi-evergreen leaves provide structure and movement, while its feathery inflorescences add texture in late summer.

The interplay of rocks, greenery, and flowers creates a harmonious and inviting space. By choosing drought-tolerant, low-maintenance plants that complement your rock garden's design, you can transform your garden into a stunning, eco-friendly sanctuary. So, experiment with diverse textures, colors, and forms, and watch as your garden evolves into a truly unique and captivating space.