The flowers of this Arrowhead are fully double. When in full bloom it is a sight to behold. This plant is a mutation of our native European Arrowhead, and like this is prefers shallow water and it is fully hardy. In books and the internet this plant is often mentioned with two invalid names: Sagittaria japonica `Flore Pleno` and Sagittaria latifolia `Flore Pleno`.
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