Pontederia cordata (pickerelweed, "Nagabamizuaoi")

Japanese name: ナガバミズアオイ （長葉水葵）
Scientific name: Pontederia cordata

[Overview]
A perennial 60–120 cm tall, growing in wet marshy places.
The leaves are simple and basal, long heart-shaped, about 25 cm long, with entire margins.
They have long petioles.
At the tip of a flower stalk about 60 cm tall, a spike 7–15 cm long bears many blue-purple flowers with 6 petals.
The uppermost petal has a yellow spot.
The fruit is a capsule.

[Cultivation]
Propagate by division or from seed.
It prefers sunny, wet marshy places.
Even if the water freezes, it will not die as long as the rhizomes in the soil do not freeze.
There are no particular pests or diseases.

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