Isatis glauca

Isatis glauca is a perennial in the cabbage family, Brassicaceae. Kew places its native range from Türkiye to Israel and northwestern Iran. Plants For A Future also lists Syria and Armenia. It is not native to Britain or Ireland. Kew links the species with a subtropical climate. In Turkey, it grows on steppe and in fallow fields. These sites lie at elevations of 2,625–5,741 feet [800–1,750 metres].

The plant reaches about 3.3 feet [1 metre] in height. Its perennial habit means it lives for more than two years. The supplied species account gives no mature spread. It flowers in June, according to Plants For A Future. Each flower has both male and female organs. Insects pollinate the flowers. The evidence gives no species-level details on flower colour or fruit. Nor does it describe the leaves, stems, or overall shape in detail.

Grow this species in a sunny bed with good drainage. Plants For A Future states that it cannot grow in shade. It prefers fertile soil but also grows in ordinary garden soil. Sandy, loamy, and clay soils can all suit it. Good drainage remains important across these soil types. It accepts mildly acid, neutral, and mildly alkaline conditions. The stated moisture preference is moist soil, rather than dry ground. Plants For A Future lists USDA hardiness zones 6–9. Its separate UK zone 7 label is not an RHS hardiness rating.

Seeds and spring division offer two ways to raise new plants. Sow seeds outdoors in spring or autumn. They can go straight into their final site or a seedbed. When seed is scarce, the source suggests spring sowing in a cold frame. Move seedlings into separate pots once large enough to handle. Plant these young plants out in early summer. Cultivated beds are the listed garden setting. The leaves provide a blue dye, which is its recorded practical use.

Plants For A Future records no known food or medicinal uses. It also lists no known hazards. That does not establish safety for people or pets. The supplied evidence names no specific pests or diseases. It does not flag this species as a weed.