Centaurea orientalis

Centaurea orientalis is a beautiful perennial native to the Caucasus. It forms a vigorous, slightly scruffy clump with finely cut leaves of a greyish-green colour. In summer, it produces fluffy, light-yellow florets, borne in large numbers at the ends of upright stems. Sun, heat, and good drainage are the key factors for successfully growing this superb, resilient, and hardy species, which is still relatively unknown and deserves a home in our gardens.

Centaurea orientalis belongs to the botanical Asteraceae family (formerly known as Composites). Centaureas have long been present in gardens, particularly Centaurea montana, an exuberant perennial that adorns flower beds with its blue-purple flowers. However, Centaurea orientalis is of a completely different nature. Originating from the Balkans and the Caucasus, all around the Black Sea, it thrives in arid, rocky, dry, and exposed environments. The plant forms a compact clump, adorned with deeply cut, greyish-green leaves. Between June and September, it produces hundreds of charming, fluffy heads of a rarely seen straw-yellow colour within this genus. Each head, composed of dozens of tightly packed flowers, measures approximately 3cm (1in). As with many centaureas, the bracts (small scale-like leaves located just below the head) are finely ornamented and worth a closer look: they resemble tiny pieces of lace! It is important for pollinators, just like many other species within the genus. When in flower, the clump reaches about 60cm (24in) in height and 50cm (20in) in width. It propagates through suckers, which slightly increases its diameter over time, but not as aggressively as sometimes seen with Centaurea montana.

Although extremely hardy (the stump can withstand temperatures as low as -25°C (-13°F)), Centaurea orientalis will thrive only if provided with what it loves: warmth, sun, and perfectly well-drained, rocky soil with a tendency towards limestone. It will not live long in heavy, clayey soil that becomes waterlogged in winter. The addition of sand or pumice can prove beneficial, and you can also raise the plant to promote water drainage. Avoid very rich soils, as they will result in a lanky plant with a drooping habit and little aesthetic appeal. Under good conditions, however, it will thrive for many years, delighting you each summer with its unruly blooms, even if water becomes scarce for several weeks.

Plant in a scree garden with the blue-violet blooms of Salvia nemorosa 'Caradonna' or Salvia pratensis 'Twilight Serenade'. Anthemis Kelwayi, blue catananche, and dwarf iris 'Cherry Garden' are also excellent companions, creating an ultra-floriferous rockery scene that is resistant to drought.

Its sturdy stems are perfect for creating beautiful dried flower arrangements, combining them with cornflowers and poppy seedheads.