Water chestnut (Trapa natans)
Care, watering, light and tips for Water chestnut on Floravia.
Quick facts
- Family: Lythraceae
- Difficulty: Demanding
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
About Water chestnut
Trapa natans, also known as water chestnut or water caltrop, is an annual floating aquatic plant with submerged and floating leaf rosettes. Its diamond-shaped, toothed floating leaves form a green carpet on the water's surface. It is ideal for ponds, large aquariums, or slow-moving water bodies, providing unique visual interest and serving as a refuge for aquatic fauna.
Native range
Europe, Asia, and Africa
Care tips
It requires full sun to partial shade for optimal growth and produces edible fruits under suitable conditions. It needs calm, not too deep water (20-100 cm), and a nutrient-rich substrate at the bottom of the pond for anchorage. Ensure the water temperature is maintained between 20-30°C. A common mistake is not controlling its spread, as it can become invasive in warm climates.
How to save a dying Water chestnut
- Warning signs
- Yellowish or brown floating leaves, soft and disintegrating. Lack of new growth.
- First aid
- Remove dead leaves. Check water: clean, oxygenated, pH 6.5-7.5. Ensure 6-8h direct sun.
- What kills it
- Stagnant, dirty, or nutrient-rich water (algae). Insufficient direct sunlight.
- Can it be saved?
- Yes, if roots are healthy and water/light conditions are corrected promptly.