P. Occasionally offered in catalogues, this tuberous-rooted plant has long, grass-like foliage and feathery plumes of small, creamy-white flowers in July. There is some fragrance. Where it does well, this species may reach 6 ft., but it must have deeply-dug, moist soil, enriched with peat, compost, leaf mould, well-rotted farmyard manure and similar moisture-retaining materials. Increase by division in spring.

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