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A picture of a Water Caltrop

Water Caltrop

Trapa spp.

Photo by Francesco Cecere (CC BY 4.0)

Full Sun
Frequent watering
Tender

11b

USDA zone

7°C

Minimum temperature

Expected size

Height
Spread

1cm

Max

50cm

1cm

Min

10cm

1 years to reach maturity

Flowering

More images of Water Caltrop

A close up of some green Trapa leaves and a white flower
A close up of some Trapa in some water
A close up of some green Trapa leaves
A close up of a Trapa plant
Some Trapa growing outside

Water Caltrop Overview

Trapa is a small genus containing around 8 annual aquatic species in the Lythraceae family. These plants have a large natural range, across most of Europe Africa and Asia and they are commonly found growing in slow-moving water. They are commonly known by the name Water Caltrop. Flowers have 4 petals and they are typically white or yellow. The leaves are divided into two forms, those underneath the water are divided and feathery, growing along the stems. Floating leaves are produced on the water surface, these are arranged in rosettes, the leaves are toothed along the edges and oval to triangular in shape, measuring approximately 2-3cm in length, on long stems.

How to propagate Water Caltrop

Seed

Seed in spring gathered in autumn and stored in water or damp moss.

Special features of Water Caltrop

Attractive leaves

Attracts useful insects

Other uses of Water Caltrop

Grown for their foliage and flowers.