Perovskia 'Blue steel'
Perovskia are neither Russian nor sage but are sub-shrubs of the mint family originating in Afghanistan and Iran.
They have been grown in gardens since the mid 1800's and are prized for their aromatic foliage and long flowering period.
'Blue Steel' is a brilliant summer bloomer with scented silvery foliage that carries clouds of small blue flowers on strong silver stems.
It's easy to grow on very poor dry soils in full sun but to be truly successful with Perovskia means pruning. Wait until after the last frost in spring before pruning, then cut back hard to basal shoots about 15cm above the ground, always cutting just above pale green buds.
New growth emerging on low, woody stems encourages a denser habit. If plants are not pruned hard enough, growth can become lax and droopy, particularly when they are young.
Drought and deer tolerant.
Photo: Blackstem Plants
Full sun, coastal