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The cultivar 'White Spires' has an upright growing habit, producing attractive clumps that spread up to a metre wide and produces attractive lance-shaped foliage and spikes made up of small white flowers. 

Winterhardy perennial
Height 100-120 cm
Width 40-100 cm
Spacing 30-60 cm (5-7 pc/m2)
Flowering time VII-IX
Site full sun, average to medium moist soils. It is a hardy plant and does not need staking.
Propagation seeds