Trapa natans | Water chestnut (floating) | Marginal Plant
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- Annual floating aquatic plant with attractive rosettes
- Thrives in full sun in slow-moving, nutrient-rich water
- Produces edible, horned nuts (water chestnuts)
- Provides surface cover, helping to shade water and reduce algae
Water Chestnut features rosettes of glossy green, fan-shaped leaves with toothed edges that float on the water surface. The petioles (leaf stalks) near the rosette's center are often inflated, aiding buoyancy.
Small, inconspicuous four-petalled white flowers appear in summer amongst the leaves, followed by hard, woody, distinctively horned nuts that mature underwater. These nuts are edible after boiling or roasting.
The plant provides valuable surface cover, which helps to shade the water, keeping it cooler and reducing algae growth. It also offers shelter for small aquatic creatures.
Grows best in warm, sunny conditions in ponds, lakes, or slow streams with nutrient-rich water. As an annual, it reproduces from seed. Note: It can be highly invasive in some areas (e.g., North America); always check local guidelines before planting.
