Sub-species
subsp. discolor 'Sterilis', syn. 'Sterilis'
This plant produces medium size flower heads and the grey green leaves are pubescent on the underside.

Cultivars
'Annabelle'
This plant has large flower heads up to 200mm (8in) across and is composed mainly of sterile flowers.

'Grandiflora'
This plant has profuse flower heads up to 150mm (6in) across appearing throughout summer.