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Cardon Gigante di Romagna Bio - Ferme de Sainte Marthe

Not to be missed!

Cardoon Plein Blanc Inerme - Cynara cardunculus

Cynara cardunculus Gigante di Romagna
Artichoke thistle

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per pack of 20 seeds approximately

3,80 €

Sku: 16952

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This plant carries a 6 months recovery warranty

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'Plein Blanc Inerme' is a naturally self-blanching variety with broad, fleshy ribs. The finely serrated leaves are spineless. Cardoon is a large plant related to the globe artichoke. It has long, serrated, silver-grey leaves and lavender thistle-like flowers.

Ease of cultivation

Beginner

Height at maturity

1.75 m

Spread at maturity

1 m

Soil moisture

Moist soil

Germination time (days)

30 days

Sowing method

Direct sowing, Sowing under cover

Sowing period April to August

JAN J

FEB F

MAR M

APR A

MAY M

JUN J

JUL J

AUG A

SEP S

OCT O

NOV N

DEC D

Flowering time June to September

JAN J

FEB F

MAR M

APR A

MAY M

JUN J

JUL J

AUG A

SEP S

OCT O

NOV N

DEC D

Harvest time August to October

JAN J

FEB F

MAR M

APR A

MAY M

JUN J

JUL J

AUG A

SEP S

OCT O

NOV N

DEC D

Description

'Plein Blanc Inerme' or ‘Smooth Solid’ Cardoon is a naturally self-blanching variety with broad, fleshy ribs. The finely serrated leaves are spineless. Cardoon is a large plant related to the globe artichoke. It has long, serrated, silver-grey leaves and lavender thistle-like flowers. The spined varieties have a stronger flavour than the spineless "inerme" varieties but they are more difficult to harvest. Cardoon can be grown as an ornamental plant or as a vegetable. Make sure to give it enough space - mature cardoons can reach 1.50 to 2 m in height and 1 m in width. When grown as a vegetable, the ribs (i.e. leaf stems) are blanched then fried, braised, or tossed into a salad or a gratin.

Harvest: With the exception of self-blanching varieties, cardoons need to be blanched 3 weeks before harvesting. Blanch the stems as and when required. When deprived of light, the leaves will whiten and become more tender. Tie the leaves together in a loose bunch. Make sure air can circulate. Surround them with thick cardboard, allowing the tops of the leaves to stick out. Make a 25 cm high mound of soil around the base of the plant. After about 3 weeks, uncover the leaves and cut them off at ground level.

Storage: Fresh ribs will keep for a few days in the refrigerator. To prolong harvests throughout winter, pull up the cardoon clumps before the first frosts. Place them in sand in a frost-free, dark place, and keep them watered.

Good to know: Cardoons like rich, fertile soil. Grow them after plants from the Fabaceae family (such as peas or beans) as the soil will be enriched with nitrogen. Cardoons are relatively slow-growing plants and can be grown alongside plants with shorter life cycles such as lettuces or radishes.

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Family sheet

Modified the 27 October 2025 by Virginie T. 11 min.

Cardoon: planting, growing, harvest

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<a href="https://en.promessedefleurs.eu/vegetable-gardens/vegetables-by-variety/cardoons.html" target="_blank" rel="noopener">Cardoon (Cynara cardunculus)</a> is a majestic vegetable plant that forms large clumps of deeply lobed leaves with fleshy midribs, known as cardes. Unjustly forgotten, cardoon reveals a taste similar to that of its cousin, the artichoke, with an additional hint of bitterness. Cardoon is sometimes confused with Swiss chard; however, unlike the latter, its leaves are not edible: it is the midribs that are sought after and, once blanched, lend themselves to numerous recipes. They can be prepared in a thousand and one ways, particularly in gratins, with pith in Lyon, or simply as a side dish for meat. It is said that there is no good cardoon without thorns; indeed, two types of cardoons can be distinguished: the thorny cardoons, with full midribs that are very tasty, such as 'Silver Spiny of Plainpalais', and the inermous varieties that are conveniently thornless, like the <a href="https://en.promessedefleurs.eu/vegetable-gardens/vegetable-seeds/cardoon-seeds/cardoon-spineless-full-white-cynara-cardunculus.html" target="_blank" rel="noopener">'Spineless Full White Cardoon'.</a> Today, to make our lives easier, there are even varieties that naturally blanch. It’s all a matter of taste! Whether thorny like the <a href="https://en.promessedefleurs.eu/vegetable-gardens/vegetable-seeds/vegetable-seeds-from-a-to-z/cardoon-artichoke-thistle.html" target="_blank" rel="noopener">wild cardoon</a> or inermous, it is an easy vegetable to grow in the vegetable garden, in the sun, in rich, cool, well-drained soil. Its imposing, lobed foliage and flowering in large upright purple thistles will also add a very architectural touch to the ornamental garden. We invite you to discover the most beautiful varieties in the form of <a href="https://en.promessedefleurs.eu/vegetable-gardens/vegetable-seeds/cardoon-seeds.html" target="_blank" rel="noopener">seeds</a> or young plants!

Harvest

Harvest time August to October

Type of vegetable Leaf vegetable

Vegetable colour green

Size of vegetable Medium

Interest Nutritional value, Productive

Use Cooking

Plant habit

Height at maturity 1.75 m

Spread at maturity 1 m

Growth rate normal

Foliage

Foliage persistence Deciduous

Foliage colour grey or silver

Botanical data

Genus

Cynara

Species

cardunculus

Cultivar

Gigante di Romagna

Family

Asteraceae

Other common names

Artichoke thistle

Origin

Western Europe

Annual / Perennial

Biennial

Product reference • 169521

Planting and care

Sowing under cover: cardoons can be sown in trays in cold frames or greenhouses in April-May. Use rich soil, amended with well decomposed compost. Sow the cardoon seeds in seed pockets, a few cm deep. At the 3 leaf stage, thin them out keeping only the most vigorous seedlings. Once they are strong enough to be handled, they can be transplanted to their final location. Make sure to leave about 1 m in all directions between each plant.

Direct sowing: from May until July, when the soil is warmed up. Loosen the soil and amend it with well-decomposed compost. Sow 3-4 seeds in seed pockets, a few cm deep. Water generously. When the seedlings reach the 3 leaf stage, thin out keeping only the most vigorous seedlings. Make sure to leave about 1 m between each plant.

Harvest in September or October, about 5 months after sowing.

Seedlings

Sowing period April to August

Sowing method Direct sowing, Sowing under cover

Germination time (days) 30 days

Care

Soil moisture Tolerant

Disease resistance Good

Pruning No pruning necessary

Intended location

Type of use Border, Vegetable garden

Hardiness Hardy down to -12°C (USDA zone 8a) Show map