This white flowered form makes the usual clump of garlic-smelling leaves, but instead of the normal pink-mauve flowers, tall stems carry umbells of pure white flowers over a long period in summer.
('Snow Giant'.) Growing to around 60 to 80 cm, not sure where the reference to Giant fits in. Nonetheless this is a good plant for growing in wet heavy soil, along with Lythrum, Filipendula etc.
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