Cardoon is a perennial, closely related to globe artichoke. It is prized by people from the
Mediterranean countries for its unique flavor. The young tender leaf mid-ribs and immature
flower stalks are used. The plant hearts are sometimes blanched like celery stalks (maturing in
Spineless and spiny types exist. The spineless types are preferred. Named varieties
are difficult to find in U.S. seed catalogs. Often the only option is a generic cardoon with
no variety mentioned. 'Tenderheart' and 'Gigante' can be found in some current catalogs. One
may also search European catalogs. Varieties recently available included Bianco Ameliore, Italian
Dwarf, Large Smooth, and White Improved. Any of the above can be considered suitable for trial in the
Caution: Cardoon is considered a nuisance weed in some areas of Northern California. Cardoon produces hundreds of seeds that float on the winds and reach locations that
are very difficult to reach by ground-based weed-abatement teams. These hard-to-reach places become sources of seed for infestations of crop and rangeland. Cardoon is very hardy
and prolific in areas with mild winter climates.
Cardoon does best in a frost-free coastal area with cool foggy summers. It is closely related to
the globe artichoke but is more vigorous and tolerant of climatic variations. Leaves can reach 3-5
feet in length with crowns 4-6 inches in diameter under ideal conditions. Cardoon will be inedible
when grown under hot conditions due to the strong bitter compounds that form.
Cardoon is a perennial plant that will grow on a wide range of soils, but it produces best on a
deep, fertile, well-drained soil. The plant is deep rooted and should be planted on soils that afford
adequate area for root development. Steady, uniform growth throughout its entire growth period
is important for good quality product.
SEEDING AND TRANSPLANTING
Cardoon seed numbers approximately 700 per ounce, with approximately 4-5 lb seed needed
per acre. Production is best when transplants are grown and set out in spring, but direct seeding
may also be used. For transplants, sow seed in the greenhouse in early or mid-March for
transplanting in mid-May for October or November harvest. Cardoon is sensitive to frost.
Direct seed in the field in early to mid May and thin to a final stand. Seed or transplant into an
8 to 10-inch deep trench and cover seed with about 1 inch of soil. As plants grow additional soil is
added until the trench is filled.
Like artichokes, cardoon may also be propagated from stem pieces or suckers that develop off the
Space plants 18-24 inches apart in rows 36-48 inches apart.
Fertilizer applications should be made according to current soil test information. The following
are general recommendations:
Twenty-30 tons/acre of manure, if available, worked in before planting.
Nitrogen: 60-100 (N) lb/acre - Apply all at one time in early spring before buds begin to form.
Phosphorus: 100-200 (P205) lb/acre - Broadcast and worked in before planting.
Potash: 100-200 (K20) lb/acre - Broadcast and worked in before planting.
Sulfur: 15-25 (S) lb/acre - Broadcast and worked in before planting.
Cardoon requires a uniform supply of moisture. Leaves and stalks become pithy when subjected
to water stress, making them unmarketable. About 10-12 inches of water, uniformly distributed
throughout its growing period may be necessary.
Soil type does not affect the amount of total water needed, but does dictate frequency of water
application. Lighter soils need more frequent water applications, but less water applied per
HARVESTING, HANDLING, AND STORAGE
As the leaves near maturity, they are tied together near the top and the plants are then wrapped in
burlap, paper, or other material to blanch the leaf stalks or petioles. Generally 4-5 weeks may be
needed for blanching.
Harvest commences about 120 to 150 days after planting. The blanched plant parts are harvested
by cutting just below the crown and trimming excess loose leaves off, leaving only the trimmed,
blanched heart some 18-24 inches in length and 2-3 inches in diameter.
Cardoon hearts are seldom stored; but for temporary holding a temperature of 32 F is
recommended, with a relative humidity of 95 to 100 % to prevent wilting or drying. Cardoon of
good quality without decay or freezing injury will keep in good condition for 2 to 3 weeks at 32
Consult buyers as to their packaging requirements.
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