This herbaceous perennial that can grow to 1 metre in height, but it is more often seen in somewhat shorter thickets. It has long slender green leaves and bears pretty tubular blue flowers followed by green cigar shaped fruit. It produces a monoculture once established, usually along waterways.

This beautiful hybrid perennial Salvia has soft grey green foliage and grows to 75cm in height. Flowers are profuse and bright deep blue and cover the bush from spring to autumn. It is quite hardy, tolerates some frost and endures dry conditions once established. Prune back after each flowering to encourage a new flush of foliage and flowers.

This dense low growing groundcover has striking grey foliage, growing 30cm high and up to 1 metre wide. In the warmer months the plant is covered in bright sapphire blue flowers. Whilst this is a hardy groundcover, it will need some protection from frost. It will tolerate dry conditions but does best with some soil moisture.

This spectacular Australian native shrub handles a range of harsh conditions. Preferring a sunny site with good drainage the beautiful silver foliage makes a wonderful contrast in any garden. The flowers are vivid blue and stand out against the silver foliage. It will tolerate some frost and drought and this hardy plant is stunning.