Alisma plantago-aquatica canaliculatum (A.Braun & C.D.Bouché) Miyabe & Kudô
Alisma rariflorum Sam.
Alisma canaliculatum is a herbaceous perennial water plant with tubers 10 - 30mm in diameter. The plant produces a clump of leaves 9 - 30cm long and flowering stems 35 - 65cm long[
The plant is sometimes harvested from the wild for local use as a food.
Although no mention of toxicity has been seen for this plant, the fresh leaves and roots of the closely related Alisma plantago-aquatica are poisonous, though the toxins are destroyed by thoroughly cooking or drying the plant[[
E. Asia - southern China, Taiwan, Japan, Korea.
Wet places all over Japan[
]. Margin of lakes, ponds, marshes and streams in China[
Succeeds in a sunny position in boggy ground or shallow water up to 25cm deep[
Young plants - cooked. Used in soups[
]. Some caution is advised, see the notes above on toxicity.
Seed - best sown in a cold frame as soon as it is ripe. Place the pot in about 3cm of water to keep the soil wet. Pot up the seedlings when large enough to handle and keep in the cold frame for the first winter, planting out in late spring.
Division in spring or autumn. Fairly easy, the divisions can be planted straight out into their permanent positions.