Onopordum illyricum aka Illyrian Thistle

Onopordum illyricum is a biennial in the daisy family, Asteraceae. Its common names include cotton thistle and Illyrian cottonthistle. Its native range runs from southern Europe to western Iran. Records include Portugal, Spain, France, Italy, and the Balkan region. The range also includes Turkey and Syria. It is not native to Britain or Ireland. Kew places it in the subtropical climate group.

This species reaches about 4.3 feet [1.3 metres] in height. Its biennial habit gives it a two-year life cycle. It flowers from July to September, with seeds ripening from August to October. Each flower has both male and female organs. Bees pollinate the flowers, and the plant is self-fertile. The blooms draw bees and give the plant value for wildlife. It can grow in cultivated beds with suitable soil and light.

Choose a sunny site with soil that drains well. Plants For A Future recommends full sun for cultivation. It also lists light shade as a condition the plant tolerates. The species grows in sandy, loamy, or clay soils. Most ordinary garden soils suit it if drainage is good. It accepts mildly acid, neutral, and mildly alkaline ground. Slightly alkaline soil is its preference. The same source lists moist soil as its preferred moisture level. It reports hardiness to about 5°F [−15°C] and USDA zones 6–9.

Seeds offer a way to raise new plants. Sow them where they will grow in spring or autumn. Small seed supplies can start in greenhouse pots in spring. Move seedlings into separate pots once large enough to handle. Plant these out in their final sites in early summer. The plant also spreads by self-sown seed, sometimes becoming a nuisance. Hoe out unwanted seedlings, or move them while still small. This tendency to seed freely matters when choosing a garden site.

The cooked flower buds have a recorded food use. They can replace globe artichokes, though preparing them takes more work. Plants For A Future gives their food value a low rating. It lists no known medicinal uses or other practical uses. The source reports no known hazards for this species. That statement does not establish safety for every person or pet. Its documented garden value lies in its flowers and appeal to bees.