Twin-flower Knawel
Scleranthus biflorus
Green Carpet
About this plant
Scleranthus biflorus is a small, spreading plant with fine, grass-like leaves and tiny greenish flowers that often appear in pairs. It forms a dense, soft mat, making it popular as ground cover or in rock gardens. It is appreciated for its low maintenance and drought tolerance.
Taxonomy
- Genus
- Scleranthus
- Family
- Caryophyllaceae
- Higher classification
- Order Caryophyllales
- Plant type
- Perennial
- Lifespan
- Perennial
Origin & Distribution
- Native region
- New Zealand
- Distribution
- Native to New Zealand and cultivated in gardens worldwide, especially in temperate regions.
Care
- Light preference
- Partial sun
- Suitable locations
- Indoor, Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, East-facing, West-facing
- Watering frequency
- Moderate
- Watering interval
- 5–10 days
- Humidity
- Normal
- Minimum
- 5 °C
- Maximum
- 30 °C
- Optimal
- 15–25 °C
- USDA hardiness zones
- 8–11
- Soil pH
- 6.0–7.5 (neutral to slightly acidic)
- Soil type
- well-draining sandy or loamy soil
Watering. Water moderately, allowing the topsoil to dry out between waterings. Avoid overwatering to prevent root rot.
Fertilizing. Feed lightly with a balanced, diluted fertilizer during the growing season (spring and summer). Too much fertilizer is unnecessary and can harm the plant.
Scleranthus biflorus is a tough, low-growing plant that needs minimal care. It prefers well-draining soil and does well in sunny to partly shaded spots. Overwatering can cause root problems, so allow the soil to dry between waterings. It requires little maintenance and is good for beginners.
Propagation
- Propagation methods
- Seeds, Cuttings, Division
- Care difficulty
- Easy
Ornamental features
- Flowering
- Yes
- Flowering period
- spring–summer
Fine, grass-like foliage forming a soft mat; small paired greenish flowers; low, spreading form.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Not considered a weed
Non-toxic to humans and pets, safe to have around children and animals.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Pollen
- Pollen level
- Low
Scleranthus biflorus is generally not known to cause allergies. People sensitive to plant pollen or sap are unlikely to have reactions from this plant. It is safe to grow indoors or outdoors without special allergy concerns.
Common problems
Overwatering can lead to root rot. Poor drainage or too much shade may cause weak growth. Occasionally, pests like aphids may appear but are not common.
Uses
Used mainly as ground cover in gardens, rockeries, and container plantings. Its dense growth helps prevent soil erosion and adds texture to garden designs.
Notes
Prune occasionally to maintain shape and remove dead growth. Repot if grown in containers every 2–3 years. Avoid waterlogging to prevent root rot.