Swamp Crassula
Crassula helmsii
Helmsii
About this plant
Crassula helmsii, also known as Swamp Crassula, is a succulent plant that grows in wet or aquatic environments. It has small, fleshy leaves and can form dense mats in water or moist soil. It is often used in water gardens and ponds but can spread quickly if not managed.
Taxonomy
- Genus
- Crassula
- Family
- Crassulaceae
- Higher classification
- Order Saxifragales
- Plant type
- Perennial
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Australia, New Zealand
- Distribution
- Native to Australia and New Zealand; cultivated in various temperate regions worldwide, sometimes considered invasive in parts of Europe.
Care
- Light preference
- Partial sun
- Suitable locations
- Indoor, Outdoor, Greenhouse
- Preferred window facing
- South-facing, East-facing, West-facing
- Watering frequency
- Moderate
- Watering interval
- 3–7 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
- moist, well-draining soil or aquatic substrate
Watering. Keep soil or substrate consistently moist but not waterlogged. In aquatic settings, ensure water quality is maintained. Reduce watering in winter when growth slows.
Fertilizing. Feed lightly during the growing season with a balanced, diluted fertilizer every 4-6 weeks. Avoid fertilizing in winter when growth slows down.
Crassula helmsii is a hardy succulent that prefers bright light and well-draining soil. It can tolerate occasional drought but should not be overwatered to avoid root rot. It requires moderate care with occasional watering and minimal fertilizing.
Propagation
- Propagation methods
- Cuttings, Division
- Care difficulty
- Medium
Ornamental features
- Flowering
- Yes
- Flowering period
- summer
Small fleshy green leaves forming dense mats; tiny star-shaped white flowers in summer.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Potentially invasive
Generally non-toxic but avoid ingestion. Sap may cause mild skin irritation in sensitive individuals.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Sap or latex, Skin contact
- Pollen level
- None
Crassula helmsii is not known to cause allergies. People sensitive to plant sap should handle it with care, as contact may cause mild skin irritation in some cases.
Common problems
Overwatering can cause root rot. Poor drainage or low light may lead to weak growth. It can become invasive in outdoor water bodies if not controlled.
Uses
Used as an ornamental aquatic or semi-aquatic plant in ponds and water gardens. Also helps with water filtration and erosion control in aquatic settings.
Notes
Prune regularly to control spread, especially in outdoor ponds. Repot or divide if overcrowded. Avoid letting it escape into natural waterways as it can be invasive.