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.
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.