Cardoon

Cardoon (Cynara cardunculus) is a statuesque thistle from the Mediterranean, closely related to the globe artichoke. It is grown for its edible flower buds, which are harvested before they open. Plants are impressive in the garden, forming large, deeply cut silver-green leaves on stems that regularly exceed one metre. In Nordic conditions it is treated as an annual, requiring indoor starting to reach maturity in a single season.

Growing

Start seeds indoors 6–8 weeks before outdoor transplanting, sowing 1–2 cm deep in individual pots at a germination temperature of 20–25 °C. Germination takes 10–20 days. Transplant outdoors once the soil has begun to warm and night temperatures stay reliably above 5 °C. Space plants at least 60 cm apart in rows 100–150 cm wide in a sunny, open position.

Care

Water consistently and deeply, especially during dry spells; the large leaf surface loses moisture quickly. Apply a balanced fertiliser every 3–4 weeks to support vigorous growth. Keep the base of plants weed-free. Stake individual stems if the site is exposed to wind. No pinching or pruning is needed under normal conditions.

Harvest

Harvest flower buds just before they open, when they are firm and tightly scaled. Plants maturing in 85–90 days will begin producing buds in late summer. Pick buds progressively as they reach 7–10 cm in diameter; leaving buds too long causes them to open and toughen. Plants tolerate light autumn frost, extending the harvest window.

In the kitchen

Boil whole artichoke heads in lightly salted water for about 20 minutes until tender. Pull individual bracts and scrape the fleshy base with your teeth, or trim down to the heart for use in pasta, risotto, stews, and antipasti. The mild, slightly nutty flavour pairs well with lemon, olive oil, garlic, and aged cheeses.

Storing

Store freshly harvested buds unwashed in the refrigerator for up to one week. For longer keeping, blanch and freeze cleaned hearts for up to six months, or preserve in olive oil or brine. Dried outer bracts have no culinary value once the bud has opened.