Smooth rupturewort
Herniaria glabra · Caryophyllaceae
📷 Michael Becker · CC BY-SA 3.0
The gardener's calendar
Ideal time to plant smooth rupturewort: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, very fine and delicate
- Flowering
- June to August, small discreet flowers
- Adult size
- 15 cm tall, creeping and spreading habit
- Growth
- Fast, forms a dense mat
- Hardiness
- Very hardy, withstands -15°C and below
- Origin
- Central and Mediterranean Europe
- Soil type
- Well-draining, chalky, poor to moderately fertile
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Herniaria glabra mainly fears root asphyxiation. Install it in a mineral-dominant substrate, sandy or gravelly.
The common mistake
Don't overload it with compost or potting soil: the richer the medium, the more it suffocates and gets clogged.
The pro's trick
In May, a shallow scraping pass (without digging) clears debris from the center and rejuvenates the mat.
Seasonal watch
September-November: cold rains can rot it if drainage isn't spot-on.
Care
Exposure
Smooth rupturewort prefers full sun for a compact habit and dense foliage. It tolerates partial shade as well, though it may stretch slightly. Position it in a bright, airy spot, ideally facing south or west.
Watering
Water needs are very low, especially once established. Water moderately at planting time, then reduce watering even during dry spells. Excess moisture is more harmful than mild drought.
Soil Preparation
Prepare very well-draining, light and gravelly soil. Smooth rupturewort appreciates chalky and poor soils; over-enriching the potting mix encourages loose growth. An amendment of gravel or coarse sand is beneficial.
Pruning and Maintenance
No pruning is necessary. You can trim lightly in spring to boost density, but this plant naturally forms a very even mat. Simply remove any dead or diseased parts.
Fertilizer
Apply little to no fertilizer. A very diluted mineral boost once in spring is enough. Excess nitrogen will weaken hardiness and slow mat formation.
Diseases and Pests
Smooth rupturewort is very robust and rarely prone to disease. In conditions of excess moisture or poor air circulation, rot may occur; improve ventilation and drainage in such cases. No major pests are reported.
Did you know?
Smooth rupturewort owes its common name to its traditional use in folk medicine, where it was reputed to help treat hernias. Though these virtues are largely forgotten today, this small alpine and Mediterranean plant remains precious in alpine horticulture and ground cover applications, where it excels at colonizing rock gardens and crevices between stones with minimal maintenance.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Rock soapwortSaponaria ocymoides
- Snow-in-summerCerastium tomentosum
- Sticky CatchflyViscaria vulgaris
- Creeping baby's breathGypsophila repens
- Mountain sandwortArenaria montana
- Baby's breathGypsophila paniculata
Tips generated and checked by Viridia — adapt them to your local climate.