Water caltrop
Trapa natans
A floating-leaved aquatic annual cultivated in ponds for its starchy, horned nuts eaten boiled or roasted.
Family
Lythraceae
Temperature
15-25°C (absolute 10-35°C)
Rainfall
500-1200mm (absolute 300-1600mm)
Altitude
1500m
Soil pH
5.5-7.5 (absolute 5-8.2)
Soil types
warm growing season.