Molinia caerulea 'Poul Petersen' is a tussock-forming 

 grass in the Poaceae noted for its long, narrow purple spikelets. It flowers from July to September, producing open panicles. Dense tussocks give the plant structural presence and make it resistant to heath fires. The cultivar is associated with moist, acidic sites in its native range.

Molinia caerulea 'Poul Petersen' belongs to the genus Molinia and the grass family Poaceae and originates from parts of Europe, west Asia and north Africa. In the wild it occurs from lowland areas to mountain uplands and forms compact tussocks that carry long, narrow purple spikelets; flowering runs from July to September. Mature clumps can reach a substantial height and the panicles are a primary identification feature. Use acidic, consistently moist soil for reliable establishment: the species performs best on low-pH ground and is commonly found on heathland, bog and moor. It tolerates very acidic conditions and poor soils where many other garden grasses struggle. Plant into soil that remains damp through the growing season rather than a dry, free-draining bank. In UK gardens it suits bog gardens, heath-style plantings and naturalistic drifts where autumn and late-summer colour from the purple panicles is wanted. Space plants to allow the tussock to develop without overcrowding; established clumps can provide vertical structure through the summer. The long narrow purple spikelets from July to September are the plant's defining feature and the easiest characteristic to use when identifying the cultivar.

Molinia caerulea 'Poul Petersen' is a tussock-forming perennial grass in the Poaceae noted for its long, narrow purple spikelets. It flowers from July to September, producing open panicles. Dense tussocks give the plant structural presence and make it resistant to heath fires. The cultivar is associated with moist, acidic sites in its native range.

Purple Moor-grass Molinia caerulea 'Poul Petersen' produces purple panicles from July to September and favours moist, acidic sites.

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