Centaurea depressa aka Low Cornflower

Centaurea depressa, or Iranian knapweed, belongs to the daisy family, Asteraceae. Its native range runs from Türkiye through Central Asia to the western Himalaya. Kew places it in the temperate zone and lists it as an annual. Plants For A Future describes it as annual or perennial. The RHS confirms that it is not native to Britain or Ireland. It also lists Centaurea pulchra as a synonym.

This small plant reaches about 1 foot (0.3 metres) tall. Plants For A Future records it in fields and along roadsides. In southern Europe, these habitats reach about 7,550 feet (2,300 metres) above sea level. Its low height suits the scale of cultivated beds. The available species records give no details of its leaves or stems. They also give no measurements for its spread. Plants For A Future values it as an ornamental garden plant.

Flowers appear from July to August, according to Plants For A Future. Each flower has both male and female organs. Bees, flies, butterflies and moths pollinate the plant. It is also self-fertile. The supplied species evidence does not describe flower colour or fruit. Seed offers a way to raise new plants. Plants For A Future recommends sowing in a cold frame in April. Grow seedlings in separate pots before planting them out in summer.

Choose a sunny site, since this species does not grow in shade. It grows in ordinary garden soil but favours fertile ground with good drainage. Sandy, loamy and clay soils can all suit it. It accepts mildly acid, neutral and alkaline conditions, including very alkaline soil. It also tolerates poor soil and drought. Dry or moist ground suits it, provided water can drain away. Plants For A Future lists USDA zones 6–9. Its separate UK zone label does not establish an RHS hardiness rating.

The root is edible when cooked, and its flavour is reported as pleasant. Plants For A Future gives its food value two out of five. The same source records no known medicinal or other practical uses. It lists no known hazards, but that is not proof of complete safety. It does not flag the species as weedy. The supplied evidence identifies no species-specific pests or diseases.