Sagittaria trifolia var. trifolia(arrowhead, "Omodaka")
Japanese name: オモダカ（面高、沢瀉） Scientific name:Sagittaria trifolia var. trifolia
[Overview]
An emergent perennial up to 80 cm tall, growing in shallow water such as rice paddies and ponds.
Stolons creep underground and bear tubers at their tips.
The tubers are elliptical, 0.5–1 cm in diameter, with a long beak-like bud.
The leaves are basal and are of two types: submerged leaves and emergent leaves.
The submerged leaves are linear and have no petioles.
The emergent leaves are arrowhead-shaped, 7–30 cm long, with long petioles.
The flowers are borne in whorls of 3 at the nodes of the flower stalk, forming a raceme overall.
There are male and female flowers, both white with 3 petals; the male flowers are borne on the lower part of the inflorescence and the female flowers on the upper part.
The fruit is an achene.
[Uses]
The whole plant is used medicinally.
[Cultivation]
Propagate by division of the tubers.
Use heavy soil such as Arakida soil and plant in a sunny place.
Keep the roots always submerged, with a water depth of at most about 10 cm.
From spring to autumn, bury oil cake in the soil as fertilizer.
There are no particular pests or diseases.
