The term “ground cover” conjures images of lush, spreading plants that blanket the soil, suppressing weeds, preventing erosion, and adding a vibrant tapestry of green (or other colors) to our landscapes. When we think of ground cover, we often picture things like creeping thyme, vinca, or pachysandra. But what about sedum? This diverse genus, known for its succulent leaves and often spectacular blooms, frequently prompts gardeners to ask: Is sedum a ground cover? The answer, like sedum itself, is wonderfully multifaceted.
The Multifaceted Nature of Sedum
Sedum, also commonly known as stonecrop, is a member of the Crassulaceae family, a group of plants renowned for their ability to store water in their fleshy leaves, stems, and roots. This succulent nature makes many sedum varieties exceptionally drought-tolerant and low-maintenance, desirable traits for any ground cover. However, the sedum genus is incredibly broad, encompassing plants that range from towering, upright specimens to low-growing, mat-forming varieties. This inherent diversity is key to understanding whether a particular sedum fits the ground cover mold.
Defining Ground Cover: What Qualities Matter?
Before we definitively label sedum, it’s crucial to establish what constitutes a ground cover plant. Generally, a ground cover exhibits the following characteristics:
- Spreading Habit: It forms a dense, low-growing mat that effectively covers the soil surface. This can be achieved through creeping stems, rhizomes, or stolons that spread outwards.
- Weed Suppression: Its dense foliage physically inhibits weed growth by outcompeting them for sunlight, water, and nutrients.
- Erosion Control: Its root system helps to stabilize soil, particularly on slopes and embankments, preventing soil loss due to wind and rain.
- Low Maintenance: Typically, ground covers require minimal care once established, demanding little in the way of pruning, watering, or pest control.
- Aesthetic Appeal: Beyond their functional benefits, ground covers contribute significantly to the visual appeal of a garden, providing texture, color, and seasonal interest.
Sedums That Shine as Ground Cover
Within the vast sedum family, numerous species and cultivars are perfectly suited to act as ground cover. These varieties are characterized by their low-growing, spreading habit and their ability to create a dense, attractive carpet of foliage.
The Mat-Forming Sedums: The Quintessential Ground Covers
These are the sedums that most readily answer the question “Is sedum a ground cover?” with a resounding yes. They are low-growing and spread horizontally, forming a dense, interlocking mat of foliage.
Sedum spurium: This species is a classic example of a ground cover sedum. Varieties like ‘Dragon’s Blood’ (Sedum spurium ‘Dragon’s Blood’) are highly popular for their deep red foliage that intensifies in the sun and their profusion of pinkish-red star-shaped flowers in late summer. They typically grow only a few inches tall and spread enthusiastically, creating a dense mat that effectively smothers weeds. Their creeping stems root easily where they touch the soil, contributing to their rapid coverage.
Sedum album: Another excellent ground cover sedum, Sedum album is known for its small, fleshy, green to reddish leaves that often form a dense, compact mound. Cultivars like ‘Coral Carpet’ (Sedum album ‘Coral Carpet’) are particularly striking, with tiny leaves that turn a beautiful coral-pink in cooler weather or with stress. They are very low-growing and spread readily, forming a low carpet that is ideal for rock gardens, between stepping stones, or along the edges of borders.
Sedum reflexum (syn. Sedum rupestre): Also known as Jenny’s Sedum or Blue Spruce Sedum, this species is prized for its needle-like, blue-green foliage that resembles spruce needles. It forms a dense, spreading mound that can reach about 6 inches in height and spread widely. It’s particularly effective in sunny, well-drained locations, such as rock gardens, wall crevices, and as a spill-over plant in containers. Its spreading nature makes it a good candidate for covering bare patches of soil.
Sedum hispanicum: This delicate-looking sedum often forms a low, mat-like growth habit, especially in its smaller cultivars. It typically has blue-gray, powdery foliage and produces small white or pinkish flowers in summer. It’s excellent for shallow soil, rock gardens, and between paving stones, where its spreading nature can fill gaps and create a living mulch.
Sedum sexangulare: With its whorls of small, bright green leaves arranged in six distinct rows along the stems, this sedum lives up to its name. It forms a dense, spreading carpet that is very effective at covering the ground. It typically stays quite low and is exceptionally drought-tolerant once established, making it a superb choice for hot, dry, and sunny locations.
The Role of Sedum in Specific Landscaping Applications
The versatility of ground cover sedums extends to their suitability for a variety of challenging or specialized landscape situations.
Rock Gardens and Alpine Beds: The natural habitat of many sedums includes rocky slopes and crevices, making them ideal companions for rock gardens. Their low growth habit, drought tolerance, and ability to thrive in lean, well-drained soil mimic their native environments. They can fill in the spaces between rocks, preventing soil erosion and adding a splash of color and texture.
Green Roofs: The succulent nature and drought tolerance of many sedum varieties make them a popular choice for green roof installations. They can withstand harsh conditions, including intense sun, wind, and limited soil depth, while providing insulation, managing stormwater runoff, and increasing biodiversity. Sedum mats, often a pre-grown blend of low-growing sedum species, are specifically designed for this purpose.
Between Pavers and Stepping Stones: The creeping habit of many sedum ground covers allows them to spill over and between paving stones and stepping stones, softening hardscape edges and creating a naturalistic, integrated look. Their ability to tolerate some foot traffic (though not heavy or constant) makes them a practical choice for this application.
Slopes and Retaining Walls: On gentle slopes and along the tops of retaining walls, sedums can help to bind the soil and prevent erosion with their spreading root systems. Their drought tolerance is a significant advantage in these exposed locations where supplemental watering might be difficult.
Living Mulch: In sunny, dry beds, sedums can serve as an attractive and functional living mulch. They suppress weeds, retain soil moisture, and add visual interest, reducing the need for traditional mulching materials.
Sedums That Are Less Suited as Ground Cover
It’s important to acknowledge that not all sedums are created equal when it comes to ground cover. Some of the taller, more upright varieties, while beautiful and drought-tolerant, do not possess the spreading, mat-forming habit necessary to function effectively as ground cover.
Hylotelephium spectabile (formerly Sedum spectabile) and Hylotelephium telephium (formerly Sedum telephium): These are the classic “tall sedums” or “border sedums” often seen in perennial borders. Examples include ‘Autumn Joy’ (Hylotelephium ‘Autumn Joy’), ‘Brilliant’, and ‘Herbstfreude’. While they are excellent for attracting pollinators and providing late-season color with their large, showy flower heads, they grow as upright clumps, typically 1-2 feet tall, and do not spread to form a dense ground cover. Their primary role is as specimen plants or in mass plantings within mixed borders.
Sedum sieboldii: While it has a somewhat trailing habit, Sedum sieboldii is generally grown for its attractive, blue-gray, rounded leaves and its pink flowers that appear in fall. It tends to form a more mounded or sprawling plant rather than a dense, weed-suppressing mat. It can be used as a spill-over plant in containers or at the edge of a border, but it’s not a true ground cover in the same sense as the mat-forming varieties.
Cultivation and Care for Ground Cover Sedums
One of the primary reasons sedums are so appealing as ground cover is their ease of care. Their succulent nature means they are inherently adapted to conditions that would stress many other plants.
Sunlight Requirements
Most ground cover sedums thrive in full sun. In fact, adequate sunlight is crucial for their compact growth habit and for intensifying the foliage colors of many varieties. While some might tolerate partial shade, they are likely to become leggy and less robust in such conditions.
Soil Preferences
The most critical factor for sedum success is well-drained soil. Their succulent roots are prone to rot in consistently wet conditions. Sandy or gravelly soils are ideal. If your soil is heavy clay, amending it with compost, sand, or grit will be essential for preventing waterlogging. Sedums are not demanding in terms of fertility and can often thrive in relatively poor soil.
Watering Needs
Once established, ground cover sedums are exceptionally drought-tolerant. They are adapted to survive long periods without supplemental watering, making them an excellent choice for water-wise gardening or for challenging, dry locations. Overwatering is a far greater risk than underwatering. Water thoroughly only when the soil is completely dry to the touch.
Propagation and Spreading
Many ground cover sedums are easily propagated from cuttings. A small piece of stem or even a single leaf can often root and grow into a new plant, making it easy to fill in gaps or expand your planting area. Their natural spreading habit, through creeping stems that root as they grow, is also a key factor in their ability to cover ground.
Pruning and Maintenance
Ground cover sedums generally require very little pruning. You might want to trim them back if they start to encroach on paths or other plantings, or to maintain a desired shape. Deadheading spent flowers is optional; many find the dried seed heads attractive and a source of winter interest, especially when dusted with frost. In early spring, before new growth begins, it’s a good time to tidy up any winter damage or remove any debris that has accumulated.
The Verdict: Is Sedum a Ground Cover?
The unequivocal answer is a qualified yes. While the sedum genus is broad and includes many upright, non-ground-covering species, there are numerous sedums that are exceptionally well-suited to function as ground cover. These are the low-growing, mat-forming varieties that spread readily, suppress weeds, and offer a wealth of aesthetic benefits with minimal care.
When selecting sedums for ground cover purposes, it is essential to choose varieties known for their spreading habit. Look for species like Sedum spurium, Sedum album, and Sedum reflexum, and their numerous cultivars. These plants offer a beautiful, durable, and low-maintenance solution for covering bare ground, enhancing rock gardens, softening hardscaping, and contributing to sustainable, water-wise landscapes. By understanding the specific characteristics of different sedum types, gardeners can confidently incorporate these versatile succulents into their designs, enjoying their resilience and charm for years to come.
Can all Sedums be considered ground cover?
While many Sedum varieties excel as ground cover, it’s not accurate to label all of them as such. Sedums encompass a wide spectrum of growth habits, from tall, upright succulents to sprawling, low-growing varieties. Those with a creeping, mat-forming habit, such as Sedum spurium or Sedum reflexum, are the most suitable for a traditional ground cover role, effectively suppressing weeds and providing a dense carpet of foliage.
The key to identifying a Sedum as a ground cover lies in its growth pattern. Look for plants that spread horizontally, often rooting as they go, and maintain a low profile. Sedums with more upright or bushy growth, like Sedum ‘Autumn Joy’ or Sedum telephium, are better suited for borders, rock gardens, or as specimen plants rather than for mass ground coverage.
What are the benefits of using Sedum as a ground cover?
Employing Sedum as a ground cover offers numerous advantages for gardeners. Its succulent nature makes it incredibly drought-tolerant, requiring minimal watering once established, which is ideal for xeriscaping or low-maintenance gardens. Many Sedum varieties are also highly resistant to pests and diseases, further contributing to their easy-care reputation.
Furthermore, Sedum ground covers provide excellent erosion control due to their dense, spreading root systems that help bind the soil. Their varied foliage textures and colors, often turning vibrant hues in the fall, add visual interest throughout the seasons. Many also produce attractive star-shaped flowers that attract pollinators like bees and butterflies, enhancing garden biodiversity.
How do I choose the right Sedum for ground cover?
Selecting the appropriate Sedum for ground cover involves considering your specific growing conditions and desired aesthetic. Assess the amount of sunlight your area receives; most Sedums thrive in full sun, but some tolerate partial shade. Evaluate your soil type and drainage; Sedums prefer well-draining soil and can suffer from root rot in consistently wet conditions.
Once you’ve considered the environmental factors, think about the growth habit and appearance you want. For a dense, creeping mat, opt for varieties like Sedum album ‘Coral Carpet’ or Sedum spurium ‘Dragon’s Blood’. If you desire slightly taller coverage or more pronounced flower display, look at creeping varieties that might grow a bit taller, such as some of the Sedum rupestre cultivars. Always research the mature size and spread of the specific Sedum cultivar you are considering.
What are the best conditions for Sedum ground cover to thrive?
Sedum ground covers perform best in conditions that mimic their native arid or rocky environments. This typically means they require ample sunlight, ideally at least six hours of direct sun per day, to maintain compact growth and vibrant coloration. While some varieties can tolerate light shade, prolonged shade will lead to leggier growth and fewer flowers.
Excellent drainage is paramount for Sedum success. They detest waterlogged soil, which can lead to root rot. Therefore, planting them in raised beds, rock gardens, or amending heavy clay soils with grit or gravel is highly recommended. Once established, Sedums are remarkably drought-tolerant, making them an excellent choice for hot, dry climates or areas where regular watering is a challenge.
How do I plant and maintain Sedum ground cover?
Planting Sedum ground cover is a straightforward process. Ensure the soil is well-draining, as mentioned, and spaced appropriately according to the mature spread of the chosen variety. You can plant Sedum divisions, cuttings, or small potted plants. For quick coverage, plant them closer together; for slower establishment, allow more space for them to spread naturally.
Maintenance for Sedum ground cover is generally minimal. Water them regularly until they are established, after which they require very little supplemental watering. Occasional weeding may be necessary in the first year or two, but once the Sedum forms a dense mat, it will effectively suppress weeds. You can trim back any straggly growth in spring to encourage denser habit and remove spent flower stalks in late fall or early spring.
Are there any popular Sedum varieties ideal for ground cover?
Yes, several Sedum varieties are exceptionally well-suited and popular for use as ground cover. Sedum spurium cultivars, such as ‘Dragon’s Blood’ or ‘Voodoo’, are excellent choices known for their creeping habit, evergreen or semi-evergreen foliage that turns rich red in cooler weather, and pinkish-red flowers. Sedum album, particularly varieties like ‘Coral Carpet’, forms a low, dense mat of small, rounded leaves that can take on a reddish hue.
Other highly recommended Sedums include Sedum rupestre ‘Angelina’, which offers bright chartreuse, needle-like foliage that turns golden-orange in fall and spreads readily. Sedum reflexum, also known as ‘Blue Spruce Sedum’, provides blue-green, needle-like foliage and yellow flowers, creating a lovely textural contrast. These varieties are chosen for their vigorous spreading nature, drought tolerance, and attractive appearance when used en masse.