Running Rockcress: A Hardy Ground Cover with European Charm
If you’re searching for a tough, low-maintenance ground cover that can handle challenging conditions, running rockcress (Arabis procurrens) might catch your eye. This perennial forb brings a touch of European alpine charm to American gardens, though it comes with some considerations worth discussing.
What Is Running Rockcress?
Running rockcress is a mat-forming perennial that stays relatively low to the ground, creating dense carpets of small, evergreen foliage. In spring, it produces clusters of tiny white flowers that add a delicate touch to the landscape. As a member of the mustard family, it shares characteristics with many familiar garden plants, but brings its own unique spreading habit that gives it the running part of its name.
The Non-Native Reality
Here’s something important to know upfront: running rockcress isn’t a native North American plant. It originally hails from Europe and western Asia, and has established itself in a limited range within the United States, primarily in Massachusetts and Michigan. While it reproduces on its own in the wild in these areas, its invasive potential in other regions remains unclear.
As responsible gardeners, it’s worth considering native alternatives that provide similar benefits while supporting local ecosystems. Native ground covers like wild ginger, creeping phlox, or various native sedums might serve your garden goals while better supporting local wildlife.
Garden Appeal and Design Role
That said, running rockcress does have some appealing qualities that explain its popularity:
- Forms attractive, dense mats that suppress weeds effectively
- Produces cheerful white flowers in spring
- Maintains evergreen foliage through winter in most climates
- Spreads to fill spaces naturally, reducing maintenance needs
In garden design, running rockcress works particularly well in rock gardens, alpine settings, and as edging along pathways. Its low profile makes it ideal for areas where you want coverage without height, and its spreading nature means a little goes a long way.
Growing Conditions and Care
One of running rockcress’s strongest selling points is its adaptability to challenging conditions. This tough little plant thrives in USDA hardiness zones 4 through 8, handling both cold winters and reasonable heat.
For optimal growth, provide:
- Well-drained soil (it’s quite tolerant of poor soils)
- Full sun to partial shade
- Minimal watering once established
- Good air circulation to prevent fungal issues
Planting and Maintenance Tips
Running rockcress is refreshingly low-maintenance once established. Plant it in spring or early fall, spacing plants about 12 inches apart if you’re using multiple plants. The spreading habit means they’ll fill in the gaps relatively quickly.
After establishment, this plant is quite drought tolerant and rarely needs supplemental watering except during extended dry periods. It may self-seed in ideal conditions, which can be either a benefit or something to monitor depending on your garden goals.
Wildlife and Pollinator Benefits
The small spring flowers do attract some pollinators, particularly smaller bees and beneficial insects. However, as a non-native species, it won’t provide the same ecosystem benefits as native alternatives that have co-evolved with local wildlife.
The Bottom Line
Running rockcress can be a functional ground cover for specific garden situations, particularly in challenging spots where other plants might struggle. Its hardiness and low-maintenance nature make it appealing for busy gardeners or difficult sites.
However, before planting, consider whether native alternatives might better serve both your garden and local ecosystem. If you do choose running rockcress, monitor its spread and be prepared to manage it responsibly to prevent it from escaping cultivation in areas where its invasive potential is unknown.
Remember, the best garden plants are often those that work harmoniously with local conditions and support the broader web of life in your area. While running rockcress has its merits, exploring native ground cover options might lead you to discover plants that are even better suited to your specific location and garden goals.
