Molinia caerulea 'Black Arrows' belongs to the genus Molinia (family Poaceae) and is derived from the species commonly known as purple moor-grass. The species occurs across Europe, west Asia and north Africa and is widespread on moist heathland, bog and moorland in Great Britain and Ireland; it also grows from lowland areas up to alpine sites. The cultivar retains the species' narrow purple spikelets and tussock-forming habit. Grow it where soils are acidic: the species does best on low pH ground (ideally around pH 3.5–5) and will persist in very acid conditions. It favours consistently damp or wet soils rather than dry, free-draining sites, and often achieves greater height when sheltered by gorse or heather. The dense clumps make it resilient to surface fires and to the seasonal stresses encountered on heath and bog. Use Molinia caerulea 'Black Arrows' in wet or acid corners of the garden, bog gardens, naturalistic grass plantings and moorland-style schemes where its upright tussocks can be shown against low heathers. Expect narrow purple panicles from July to September that serve as a clear identification feature for the plant.

Molinia caerulea 'Black Arrows' is a cultivar of Molinia in the grass family Poaceae, forming upright tussocks of closely packed stems. It produces narrow purple flower spikelets on panicles and typically flowers from July to September. Plants can reach around 1.2 m where sheltered by neighbouring heathers or gorse. The dense tussock habit gives the plant resistance to surface fires.

Purple Moor-grass Molinia caerulea 'Black Arrows' is a tussock-forming grass with narrow purple spikelets that flower July to September.

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