Hardiness: USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Full Sun
Danger: Plant has spines or sharp edges; use extreme caution when handling
Bloom Color: Purple
Bloom Time: Late Spring/Early Summer Mid Summer
Other details: May be a noxious weed or invasive This plant is attractive to bees, butterflies and/or birds Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season This plant is resistant to deer
Soil pH requirements: 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds Wear gloves to protect hands when handling seeds
On Dec 10, 2012, coriaceous from ROSLINDALE, MA wrote:
An extraordinary plant, beautifully and dramatically architectural, the silvery color of the foliage is a great foil to other colors. The flowers are big and beautiful and showy, more blue than violet, but don't last long, and the whole plant deteriorates and needs lots of cutting back after bloom. (In fact, the only maintenance issue arises from the need to remove a fading leaf at the base almost every week, there always seems to be one or two.) The only spines are at the base of the flowers. We haven't seen any self-sowing, but we've dead-headed.
I've been astonished to find two of these have returned faithfully for at least the last four years (and perhaps more) in Zone 5/6, Southborough, MA, with no special protection. They get full sun and good drainage, and are a few feet from a south-facing brick wall. Each is the major focal point of the bed in which it resides.
On Jun 27, 2012, meredith_french from Casa de Oro-Mount Helix, CA wrote:
I was given two seedlings of this plant by Ramona Garden Club in San Diego County. After a ho hum start the plants took off. They are very appealing due to their structural shape. They grow into large fountains at least 4-5' across. As they begin to create the thistles, they will elongate with the thistles riding over the top. Knowing how invasive they are, I have been deadheading the "blossoms" the second the bees seem no longer interested in them. They will be a dull purple. I cut one thistle open out of curiosity and the base where the thistle hairs are attached to the "heart" was full of seeds. As it dried out in my kitchen, the thistle hairs separated and kinked, ready to take flight, each attached to a seed. Do not let these puppies out! They not only get into the rest of your yard, but the roadsides, hillsides and canyons. Snails and grasshoppers love this plant! The latter do not do enough damage to abandon growing them. I am curious about a fly that frequents this plant. It is 1/4" long, slightly green, clear wings. It has a chevron type mark on its back. Appears to be a pollinator. Does anyone know what it might be?
On May 13, 2012, Bellafina2003 from City View, SC wrote:
I planted this about 3 years ago, I am impressed and happy with its interesting architectural form , and the flowers are beautiful. My specimen is now over 6 ft tall and has at least 8 or 9 flower buds. It is planted in a well drained bed that has not had many soil amendments added. It has survived through the few snow and ice events we have had in the past 2 winters.
A friend gave me about 14 dried cardoon flowers for an arrangement I put on my barbeque outside on the back porch. The next spring I had about 20 baby plants. I didn't even know what these babies were because I didn't plant any seeds in the bed where they were. It took me a while to figure out the dried cardoon flowers that blew apart in the winter winds had scattered the seed. Very prolific so watch out and remove flower heads after the bloom.
On Aug 8, 2011, Hoki from Katikati, BoP New Zealand wrote:
Our large rural property, in the Bay of Plenty, NZ, borders onto a paddock with a fence and pittosporum hedge between. We have underplanted the hedge with cardoon and in late summer(March) the show is stunning with the purple flower heads and silver foliage. Dead heading is imperative but we toss the heads back under the hedge for next years show. Stunning plant!
On Jan 17, 2011, brockenborough from San Francisco, CA wrote:
I like a few things about this plant. It's low-maintenance. I am in Northern CA (Zone 8) and get no rain from April to October. My cardoons grow without irrigation in very poor clay with no amendment. They grow in shady areas that get only 3 hours of direct sun in the summer, none in the winter. They produce a large amount of material for compost per plant. I just chop off the leaves when they droop. I'm a beekeeper, and the bees love this plant. It produces a large amount of nectar and is good bee forage. The comments about its invasive nature are right on, though.
Love the look of this plant--saw it full-grown at a professionally landscaped home--very sculptural, with beautiful gray-green leaves and brilliant, eye-catching blooms. Planted two plants (app 10 inches tall) late in the summer, but neither survived the winter cold. Didn't rot, as we were having a drought and they were in a raised bed, but did not survive 21 degrees Farenheit in a south facing location in zone 7. Maybe too young? Hard to say...
On Nov 11, 2007, cowboydj from Rosenberg, TX wrote:
I was first introduced to Cardoon in Texas A&M University's Holistic Garden. Its size and unusual appearance literally "stopped me in my tracks"!! I asked, "What is THAT????" I've wanted one for myself for about two years and, now, have two. I'm so excited and can't wait to get them in the ground. Wish me luck!!!
On Nov 3, 2006, surfkitty from Union City, NJ wrote:
I decided to grow cardoon from seed, as I was intrigued by its long history and by the idea that it tastes "artichokey". We did not have any blooms this year, but our 3 plants are happily growing in a large container. It's becoming cold here in the northeast and I was wondering if it's okay to bring it indoors for winter, has anyone tried?
On Jun 30, 2006, mamajack from Fate, TX (Zone 8a) wrote:
this is a tough plant but i started out with 2. i tried to move one and was unable to get all of the root. it died and it did not come back from the remaining root. i have the remaining plant in full texas sun all day on the west side. it lives in hard packed clay soil without any supplemental water. it does get huge. i have never had even one volunteer seedling. several years ago it was attacked by leaf footed bugs. i thought it had died but next spring it was back. it does have spiny leaves. this plant provides winter interest by leaving the plant stalk and dried flower heads.
On Jun 6, 2006, blackbunny from Provincetown, MA wrote:
I grew this plant a few years ago for food, but found the stalks too stringy for my taste. The upside is that the blooms were a trip...covered with every conceivable bird and bug, and stunning to boot. The next year, I experienced the invasive side as baby cardoons came up everywhere in my vegetable garden (easy to identify and pull). I skipped a year and have decided to cautiously allow one to grow in the back of my bed for the entertainment value, and to feed my beloved chickadees and finches. One other person in town has been growing them for several years and they don't seem to have posed an invasiveness problem here in ecologically delicate Provincetown MA. I'll keep you posted, but for the meantime any bird&bug lover who enjoys a spectacular thistle may enjoy growing a cardoon or two....
On May 1, 2006, vossner from Richmond, TX (Zone 9a) wrote:
I like this plant because it is dramatic. Love the coloring. Its grayish (sp?) leaves against other plants is very visually pleasing, to me, anyway. Since I have only had it for about a year, can't say anything about its invasiveness. so far no problem. Planted inground, full sun. As of this writing, plant is in bloom, it is all I can do not to cut the flower and bring it inside the house. Quite stunning!
On Jun 3, 2005, PurplePansies from Deal, NJ (Zone 7a) wrote:
Currently growing (for edible purposes).... not yet harvest so no positive or negative yet. Stems are used for eating after being "blanched" in cardboard. A favorite in Italy and France and with Italian Americans.
So far I have found seedling fairly prone to rotting in wet spring soil.
Seedling id: fleshy rounded (before true leaves) dark green with white veining at leaf veins.
On Aug 30, 2004, CaptMicha from Brookeville, MD (Zone 7a) wrote:
A very hardy plant but not hard to eliminate in my opinion. The best way to get rid of unwanted plants in by digging up as much of the root as possible. They don't like to be disturbed and have always died when I've done it.
DO NOT let this plant go to seed b/c the seed are carried by animals, especially birds and mice making nests and they carry on the wind. If seeds gets away, cardoon will sprout anywhere it lands.
Japanese beetles target this plant. Other then other beetles, I haven't observed other pests.
On Aug 25, 2004, hannahd from Traverse City, MI wrote:
Last year, I planted five cardoons from seed in April in my north Michigan (Zone 5) garden. At the end of the season I dug out and destroyed all of them, or so I thought, since I did not believe that they would survive our harsh winters. To my surprise, one came back from what must have been left of the the roots and grew into a glorious plant over the last few months. It is now blooming with about a dozen flowerheads, and reaching about 6ft tall and 5 feet wide. Has anyone else had a cardoon survive a zone 5 winter?
On Aug 10, 2004, inheritedgarden from Edison, NJ wrote:
We bought a house that came with a large (20' x 40') garden last summer... we weren't sure what would grow this year, so I took a "wait and see" approach.... well, we have/had cardoon and my FIL actually knew what it was, etc. so I had planned to blanche some of it, and harvest it. It grew to about 6 ft tall, and a huge rainstorm flattened just about all of it. Part of it fell over into the "lawn" portion of our yard, and proceeded to sprout in the grass, so we pushed it all back into the garden. Because it is so attractive to bees, I had to wait until this past weekend's 70 degree/cloudy weather to pull it out. New growth had started to grow from the now flattened, but not dead stalks. It's quite hardy and that's not a good thing. 5 hours and 14 plastic garbage bags later, it is mostly gone... we chose plastic over paper leaf bags to avoid spreading it to anyone else in our town. We have since found more cardoon growing in all parts of our garden, lawn, and other parts of the yard. If you choose to grow cardoon, make sure you tend to it daily, and you want it. We were unlucky that we didn't know what was what and we had never gardened before. Our variety was quite spiny and even wearing leather gloves, my forearms were "stuck" over and over again and appear to have a rash.
On Jul 24, 2004, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:
I remember eating this vegetable in Spain where it is quite popular.
We used it in place of artichokes when we wanted the flavor of the artichoke but did not want to spend as much money.
It is great for flavoring rice dishes and stews. It is also great by itself, but stronger tasting than the artichoke.
On Jul 23, 2004, foodiesleuth from Honomu, HI (Zone 11) wrote:
I'm happy to report that cardoon will grow in the Waimea (Kamuela) area of the Big Island in Hawaii. It was planted as an experiment for a cooking demonstration that would be presented by Mario Batali (Molto Mario) during a food seminar in Hawaii in March 03....the plants were planted months in advance and did great. The presentation went quite well and we all got to taste cardoon with handmade pasta made with semolina, which we helped prepare.
Since then the Hirabara Farm (small boutique farm) where the demonstration/cooking class took place, has been continuing to grow it. The farm is located at about the 3,000 foot elevation
On Jul 22, 2004, Ray1431 from Antwerpen Belgium wrote:
Cynara cardunculus grows since ages in the vegetable gardens around castles even in Belgium although the plant grows more likely in France, Italy etc. If used as vegetable the leaves must be winded together and covered with black plastic at the end of august, early september to create a hothouse effect. This makes the leaves and stems to loose their greygreen colour and it softens the stems.
Cynara cardunculus is a delicate vegetable although it requires a long boiling time over 2 hours or 50 minutes in a pressure cooker. Note that only the stems (very well cleaned) are eaten and are cut in pieces of 6 cm. A good seed is "Plein Blanc", inerme from Clause, France, means Fully white, unarmed (not prickly).
On Jun 21, 2004, suncatcheracres from Old Town, FL wrote:
I grew cardoon several years ago in an Atlanta suburb, zone 7b, from a packet of seeds. I had about a half dozen plants survive the ravages of rampaging leafhoppers that devoured most of my seedlings, and one cardoon grew to about 8 feet tall, with gorgeous purple-blue thistles. This plant was in the front yard, near the street, and everyone commented on it.
The others only grew to about 3 feet, and none of them survived a very cold winter at almost a 1,000 feet high--Atlanta can be a very cold place indeed, in the winter, despite being in the South, and I was sad that they didn't come back, as this was a very attractive plant. Obviously it is not invasive in that climate. I tried eating some of the new leaves, as the Romans ate it, but they were very bitter.
On Jun 20, 2004, Fran99 from Spartanburg, SC wrote:
I have been looking a this plant in a bed by Kinkos for several years. However, the composite flower is an azure blue rather than pinkish-purple. Does anyone know what this blue one is? After all these years of admiring it, they were digging up the bed & discarding everything, so I got one & planted it. I hope it lives in my yard.
On Oct 20, 2002, ohmysweetpjs from Brookeville, MD wrote:
Very hardy in my zone 7 yard. Lovely purple flowers that create an enviroment all of their own with bumble bees, butterflies, ants and spiders lying in wait for an unsuspecting victim. Careful though, it has tiny little spikes that lodge themselves into skin and are hard to detect by eye but easy to detect by pain.
On Aug 11, 2001, mystic from Ewing, KY (Zone 6a) wrote:
A tender perennial that can grow 6 to 8 feet high. The gray-green leaves overlap at the base and can get up to 20 inches long with ovate to linear-lance shaped segments and deep basal lopes. The wide, plump, edible stems form loose stalks or heads like celery. Cardoons keep their vase shape until late in the season, when a branching ,gray-wooly central stem shoots up. Several buds, which resemble small artichokes, grow atop this stem. These grow into purple thistle like flowers which are 1 1/2- 3 inches across.
This plant has been said to grow in the following regions:
, Alberta, Alabama Vincent, Alabama Aptos, California Casa De Oro-mount Helix, California Clovis, California Menifee, California Merced, California Palo Alto, California Rancho Palos Verdes, California San Francisco, California Weldon, California Clifton, Colorado Ocala, Florida St Augustine, Florida Kamuela, Hawaii Indianapolis, Indiana Oak Park, Indiana Brookeville, Maryland Cloverly, Maryland Cordaville, Massachusetts Jamaica Plain, Massachusetts Provincetown, Massachusetts Traverse City, Michigan Natchez, Mississippi Edison, New Jersey Weehawken, New Jersey Roswell, New Mexico Mountain View, North Carolina Raleigh, North Carolina Winston-salem, North Carolina Columbus, Ohio Enid, Oklahoma Oklahoma City, Oklahoma Ashland, Oregon Brookings, Oregon Portland, Oregon (2 reports) Salem, Oregon Laflin, Pennsylvania City View, South Carolina Columbia, South Carolina Hartsville, South Carolina Spartanburg, South Carolina Lenoir City, Tennessee Barton Creek, Texas Beaumont, Texas Buda, Texas College Station, Texas Cumings, Texas Dalworthington Gardens, Texas Fate, Texas Fort Worth, Texas Hallettsville, Texas Houston, Texas Princeton, Texas San Antonio, Texas Salt Lake City, Utah Arlington, Virginia Artondale, Washington Kalama, Washington Olympia, Washington Ridgefield, Washington Seattle, Washington