New Zealand Pygmyweed
Crassula helmsii · Crassulaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around new zealand pygmyweed and prepare for winter.
ID card
- Family
- Crassulaceae
- Foliage
- Persistent, succulent and green
- Flowering
- Spring to summer, white or pink flowers
- Adult size
- 15 to 30 cm tall, creeping to upright habit
- Growth
- Fast to moderate
- Hardiness
- Frost-sensitive, prefers minimum +5°C
- Origin
- South Africa, Madagascar
- Soil type
- Well-draining, sandy, low in organic matter
Care
Watering
Allow the substrate to dry between waterings, especially in autumn-winter when water needs decrease significantly. During active growth (spring-summer), water moderately once or twice weekly depending on conditions. Avoid standing water which promotes root rot, a characteristic weakness of Crassulaceae.
Light and Exposure
Place the plant in bright light, preferably with 3 to 4 hours of direct sun daily. Indirect light is acceptable but reduces compactness and coloration. Protect from midday sun in intense Mediterranean climates to prevent leaf burn.
Substrate and Soil
Use a very well-draining mix: succulent potting soil, sand and perlite in equal parts. Overly rich substrate promotes etiolation and weakens tissues. Neutral to slightly acidic pH is ideal.
Fertilization
Apply diluted succulent or cactus fertilizer monthly during the growing period (April to September). In winter, stop all fertilizing to allow the plant to enter dormancy. Avoid nitrogen-rich fertilizers which encourage soft growth.
Pruning and Maintenance
Regularly remove dead or etiolated stems to encourage branching. You can prune after flowering to maintain a compact shape. Cuttings re-root very easily and allow you to rejuvenate old specimens.
Diseases and Pests
Root rot is the main risk if water or stagnant humid air is excessive. Watch for mealybugs and aphids during warm periods. Ensure good air circulation and impeccable drainage to prevent these issues.
Did you know?
The Marsh Crassule originates from humid regions of southern Africa, which explains its remarkable amphibious nature: it can grow partially or completely submerged in aquatic environments while thriving in dry pots. In water gardens, it colonizes banks and shallow areas with impressive vigor.
Where to buy it
Plant in spring, once all risk of frost has gone. Pick a plant with healthy foliage and roots that are not exposed. Best time: from April to June.
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Tips generated and checked by Viridia — adapt them to your local climate.