Artichoke plants produce one large bud on a stalk and several smaller buds below it.
Globe artichoke is a vegetable grown for its tender, edible flower buds. With their large, silvery-green leaves and thick stems topped with pinecone-like flower buds, artichoke plants add a strong architectural element to vegetable garden plantings.
Thomas Jefferson reportedly raised artichokes at Monticello, his Virginia home, as early as 1767. Today the majority of commercial artichoke production is along coastal sections of Central California, where the weather suits them perfectly.
Artichoke plants thrive best where mild winters and cool, foggy summers prevail. In such growing conditions, they are perennials, yielding harvests for up to 5 years. Where winters dish up only a few frosty nights, plants will sometimes overwinter when pruned and mulched (zones 7 to 9). In colder regions, you have to treat artichokes as annuals planted in spring. They are best planted in fall in the humid, subtropical, frost-free areas of zones 10 and 11.
In zones where artichokes are perennial, select your site considering that plants will be in place for up to 5 years. Give plants room to spread, since mature plants can reach 4 to 5 feet tall and 3 to 4 feet wide.Artichokes thrive in full sun to partial shade. They also need light, fertile, well-drained soil—sandy or loam is ideal. Prepare the soil by working 5 inches of compost into a trench 8 inches deep and equally wide. Two reasons artichoke plants fail are summer drought and winter soil that’s waterlogged. Adding compost improves soil’s ability to retain water in summer and drain in winter.
Plant artichoke seedlings atop the amended soil, spacing plants 4 feet apart. In zones 6 and colder, you can plant artichokes more closely, 2 to 3 feet apart, because frost will prevent the plant from reaching its mature, established size.
After artichokes are established and unfurling new growth, fertilize plants once a month with a liquid fertilizer such as Bonnie Herb & Vegetable Plant Food. Keep soil moist throughout the growing season. You can apply a liquid high-potassium fertilizer (often called a potash fertilizer) every 2 weeks during periods of active growth to encourage flower buds to form.
Keep weeds out of artichoke beds. Give plants a thick mulch, especially in northern growing areas. Mulch with an organic material, such as dry grass clippings, straw, aged manure, or a mixture of these. As buds begin to form, remove mulch, and apply a 4-inch-thick layer of compost around each plant, extending from the base of the plant outward 12 inches.
Artichoke has few problems. Slugs may attack young foliage, and botrytis blight can coat older leaves. Beat slugs with slug bait or slug traps. If only a few leaves are infected by botrytris blight, remove and destroy them. Treat the plant with a fungicide such as neem oil.
The large buds on this artichoke plant are beginning to open and should have been harvested sooner for better flavor and tenderness. If buds are left to open on the plant, they can’t be eaten but they do make beautiful flowers in the garden.
Flower buds form in early summer atop tall stems that soar out of the center of the plant. Each stem forms several flower buds, with the top bud ripening first. Harvest buds while they’re tight and firm and hopefully at least 3 inches in diameter; if buds begin to open, they lose their tenderness. Fully open buds are inedible but produce striking, large, lavender flowers. Cut a 1- to 3-inch section of stem with each bud to make it easier to handle. The lower buds that develop later won’t grow as large as the top bud. When you have harvested all buds on a stem, cut the stem to the ground. For large, established plants, prune the entire plant back by a third to spur a fall harvest.
Artichokes keep in the refrigerator for up to 2 weeks.
These artichokes are left to bloom for ornament. This is especially useful in areas where they are perennial.
Because harvest increases with plant age, it’s best to try to overwinter artichoke plants. Some gardeners have reported success at overwintering plants as far north as Zone 5 using the techniques described below for zones 6 and 7.
For zones 8 and warmer: Following fall harvest, cut plants back to ground level or slightly below ground level. Cover with 3 to 4 inches of an organic mulch such as straw or shredded leaves.
For zones 6 and 7: Cut plants back to roughly 12 inches tall. Mound organic mulch over the plants, then cover plants and mulch with an inverted bushel basket. Feel free to use compost as this first mulch layer. Add a layer of mulch (straw is great at this point) over and around the bushel basket. Drape a rainproof cover over the mound, taking care to anchor the edges.
In spring, after the ground is no longer frozen and before growth begins, remove the winter covering. When new growth begins, fertilize plants again with Bonnie Herb & Vegetable Plant Food and add a 1-inch layer of compost or well-rotted manure around the plant.
How do I water artichokes?
Should I remove the shoots that have appeared at the base of my artichoke plants?
How do I know when to harvest artichokes?
Can I do anything to improve my artichoke harvest?
May an artichoke be sucessfully grown in a large pot?
I live in Southern Calif. Gophers in my garden took the last ones down that were planted in the ground.
Thank you
Hi Diana,
Yes, artichoke can definitely be grown in a large container, 18 inches or so in diameter. Mix in plenty of compost with your potting mix and otherwise follow the same advice in this article. Happy growing!
Kelly, Bonnie Plants
I have just finished harvesting my artichokes in west Texas… zone 7a ? Will they come back from the roots, or should I take out the remaining plant and start over?
Hi Barbara,
Give your artichoke a chance to come back next year, because artichoke will grow as a perennial in some areas. When you have harvested all buds on a stem, cut the stem to the ground. After a few years if you have a large, established plant, you can prune the entire plant back by a third to spur a fall harvest.
That being said, some people grow artichoke as an annual, either out of necessity due to climate or just out of preference. So you can pull up the plant and plant more artichokes for a fall harvest if you’d like.
Happy growing!
Kelly, Bonnie Plants
I started my artichoke in mid April after our last frost but out of 9 only 3 of them sprouted but none of them made it… is there something im doing wrong or is it just where i live (zone
Hi Sean,
It sounds like you’re starting artichoke plants from seed. Is that right? If so, you might ask our Ask an Expert service for better advice. However, Bonnie Plants does sell Green Globe artichoke, and you might find success by planting a few of our starter plants rather than trying to start from seed. Look for stores in your area by putting your zip code in our Plant Finder.
Happy growing!
Kelly, Bonnie Plants