How to Grow Sunchokes from Tubers
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If you want to know how to grow sunchokes from tubers, most of the work is planting them and keeping them in bounds. Sunchokes, also called Jerusalem artichokes, are a native perennial that grows tall and multiplies from its knobby tubers. Three extension pages describe planting, watering and harvest in similar terms. Where they disagree on depth, timing or water, this guide gives each source’s figure and marks the difference.
Quick answer
- Plant tubers or pieces with two to three strong buds in early spring, 2 to 3 inches deep and 24 to 30 inches apart.
- Choose a sunny, well-drained spot in an out-of-the-way place, because the plant spreads by rhizome and can be hard to remove.
- Dig tubers from fall into spring as you need them, and leave the rest in the ground, since the tubers are best left there until used.
What a sunchoke is
The NC State Extension Gardener Plant Toolbox describes the Jerusalem artichoke, also called sunchoke or sunroot, as “an herbaceous perennial root vegetable in the sunflower family.” The page also clears up the name: “Jerusalem artichoke is not an artichoke, nor has it any connection with the city of Jerusalem, Israel.”
The University of Arkansas guide calls it “a perennial plant cultivated as an annual that may persist in the garden as a weed.” That description explains both sides of the plant. You grow it for the tubers, and it keeps coming back from year to year. The Arkansas guide says that “The fleshy, oblong tubers may be baked, boiled or fried like white potatoes.”
Choosing the spot
Light is the first requirement. The NC page says to “Grow in full to part sun,” and it adds that the plant “does not tolerate deep shade or maritime exposure.” The Douglas County Master Gardener column says that “They grow in almost any type of soil that gets at least six hours of sunshine per day.” Six hours is the most specific sunlight figure in the three sources.
Soil is more forgiving. The NC page says the plant “will tolerate most soil types as long as they are well drained,” and warns that “Heavy clay soils prone to waterlogging will reduce yields.” The Douglas column says the plant thrives in “a well-drained garden soil with high fertility, especially potassium,” and the Arkansas guide uses nearly the same wording. The NC page adds that the plant is “happiest in slightly alkaline soils,” while the Arkansas sheet gives a pH range of 5.8 to 7.0.
Give the bed a boundary. The Douglas column says that “it is best to give them an out-of-the-way, somewhat permanent planting location,” and that the plant should be kept “a reasonable distance from other garden vegetables.” The NC page describes the plant as “Ideal for bird gardens, butterfly gardens, pollinator gardens, back of the perennial borders, or naturalized areas,” which is a useful brief for the planting spot. For a bed layout that keeps the patch apart from other crops, see our garden layout guide.
Planting the tubers
Timing is the first point where the sources differ. The Arkansas guide says to “Plant entire tubers in early spring.” The NC page says “Tubers may be planted in early spring.” The Douglas column gives a wider window: “Plant the tubers in the fall or early spring.” Early spring is the safest choice, because it is the only time all three sources agree on.
Start with healthy material. The NC page compares the plant to potatoes: “Similar to potatoes, whole tubers or pieces of tuber with at least two to three strong buds should be planted.” It also warns that “Do not allow the pieces of tuber to dry out before planting.”
Depth and spacing come from the Douglas and Arkansas sources, and they match. The Douglas column says to “Plant the individual tubers 2-3 inches deep, spaced 24-30 inches apart.” The Arkansas sheet says almost the same: “Plant individual tubers 2 to 3 inches deep spaced 24 to 30 inches apart.” The rows differ. The Douglas column suggests “a couple of feet” between rows, while the Arkansas sheet says “you should allow 3 to 4 feet between rows” because the plants “grow 6 feet high or higher.” The NC page gives no depth, spacing or row figure, so it is not used for these numbers.
| Source | When to plant | Depth | Spacing | Between rows |
|---|---|---|---|---|
| Douglas County Master Gardeners (Oregon State University Extension) | Fall or early spring | 2 to 3 inches | 24 to 30 inches | A couple of feet |
| University of Arkansas Extension, FSA6088 | Early spring | 2 to 3 inches | 24 to 30 inches | 3 to 4 feet |
| NC State Extension Plant Toolbox | Early spring | Not stated | Not stated | Not stated |
Water, mulch and care
The sources disagree about water. The Douglas column says that “The Jerusalem artichoke needs water only during extremely dry periods,” but it then adds that “the tubers will not develop without a regular supply of water.” The NC page takes a firmer line: “this plant is best with consistent moisture.” The Douglas column warns that the tubers “will not develop without a regular supply of water,” so steady watering is the safer rule to follow.
Mulch is the simplest help. The Douglas column says that “Mulching your Jerusalem artichokes is a good idea both for weed control and soil moisture conservation.” The NC page gives the shorter instruction “Mulch to conserve moisture.” For feeding, the same column says that “A yearly application of rich compost can help to maintain desirable fertility.” For compost ideas that suit a raised bed, see our compost for raised garden beds guide.
Cultivation matters early on. The Arkansas guide says that “Early cultivation and hoeing are necessary,” and then that “As the plants become established, however, little to no further care is required.” The NC page notes that a tall, bushy plant “may require some staking or protection from strong wind,” so a sheltered spot or a stake helps in a windy garden.
Harvest and storage
Harvest runs from fall into spring. The Arkansas sheet says to “Dig tubers any time from September until spring but before new growth starts in the spring.” The NC page places the main harvest in the fall, “approximately two weeks after the flowers fade.” The Douglas column says that cut tops should come off “before harvesting, usually around September,” and it explains that “Since freezing doesn’t injure the Jerusalem artichokes, the tubers are best left in the ground and can be dug as needed.”
Storage is where the sources give the most numbers. The Arkansas sheet says that “If possible, store at a temperature of 32 degrees F with high humidity (95 percent),” and it explains why: “Jerusalem artichokes do not form a thick skin like the potato and tend to lose moisture rapidly.” For a home supply, it adds that “The tubers can also be placed in polyethylene bags in the refrigerator.” The Douglas column says the same about refrigerator bags.
| Source | Days to maturity | Harvest window | Storage |
|---|---|---|---|
| University of Arkansas Extension, FSA6088 | 120 | September until spring, before new growth | 32 degrees F and 95 percent humidity, or polyethylene bags in the refrigerator |
| Douglas County Master Gardeners | Not stated | Tops cut around September; tubers dug as needed | Plastic bags in the refrigerator |
| NC State Extension Plant Toolbox | Not stated | Fall, about two weeks after the flowers fade | Not stated |
Keeping the patch in bounds
This is the part that surprises most growers. The Douglas column says “They do have a tendency to spread so they must be cultivated with care or they may become troublesome.” The NC page explains the mechanism: “It spreads by rhizome, and is self-seeding to form colonies.” It also warns that “Any tiny piece of the plant left in the soil will sprout new plants,” and that “Once established in the garden it may be difficult to remove.”
The Arkansas sheet makes the same point about harvest. “Any tubers not harvested will grow, become troublesome weeds and spread in the garden.” It rates the plant “Great for naturalizing but may become invasive,” which suits a corner of the yard better than a neat vegetable bed. Plan a boundary before you plant, and dig up any stray tubers at harvest time.
None of the three sources describes a root barrier, so this guide does not give a depth for one. Keep the spot separate from vegetables you want to harvest cleanly, and check the bed each year for new shoots.
Varieties and uses
The Douglas column says that “The cultivar that is most widely available is stampede.” It adds that “Other varieties include clearwater and golden nugget.” The column also mentions “Waldspinel, an Austrian cultivar,” which it says is a different type of tuber from the common white ones.
For the kitchen, the NC page says that “They may be boiled, mashed, roasted like potatoes, or eaten raw.” The Arkansas sheet describes the tubers as “Delicious” in its table and notes that they can be “dug from late fall to early spring.” The NC page also notes that “The seeds are especially attractive to finches,” so a patch can serve birds as well as the kitchen.
Common mistakes to avoid
- Planting in the middle of a vegetable bed. The Douglas column says to keep the plant a reasonable distance from other garden vegetables.
- Letting tuber pieces dry out before planting. The NC page says not to allow the pieces to dry out.
- Leaving tubers behind at harvest. The Arkansas sheet says unharvested tubers “will grow, become troublesome weeds and spread in the garden.”
- Skipping water in a dry spell. The NC page says the plant is best with consistent moisture.
- Ignoring height. The NC page notes that the plant may need staking or protection from strong wind.
How we chose
The guide draws on three pages from land-grant and extension sources: a Douglas County Master Gardener column from trained volunteers who help the Oregon State University Extension Service; FSA6088, a home gardening sheet from the University of Arkansas Division of Agriculture; and the NC State Extension Gardener Plant Toolbox page for sunroot. Each had to be opened with curl and checked for passages on growing the plant, and every quotation was matched against the text of the page it cites.
A fourth page, a UF/IFAS Northwest District article on Jerusalem artichoke, returned HTTP 200 but its fetched copy contained only site navigation, so it is not cited.
What we could not verify
The three sources are short, and they do not cover everything a grower will ask. The guide relies on them for planting, water, harvest and storage, and it does not add figures from memory or from retail listings.
What the sources do not say
The sources disagree on planting time, row spacing and water. None of the three gives a root barrier depth, and the NC page gives no depth, spacing or harvest weight. The Douglas column does not give a storage temperature, and the Arkansas sheet does not give a planting window for fall. The sources also do not say how long a patch takes to become established. The Arkansas table lists 50 to 100 tubers per 100 feet of row, but it does not say what that yields by weight.
Frequently asked questions
Are sunchoke tubers edible?
Yes. The NC page says that “Fresh Jerusalem artichoke tubers are edible,” and it compares their texture to water chestnuts. It adds that the tubers have a nutty flavor and can be eaten raw or cooked.
Should the tops be cut back before harvest?
The Arkansas sheet says the “large, woody tops that resemble sunflowers should be cut off above the ground before harvesting.” The Douglas column gives the timing as usually around September.
How many days does a sunchoke take to mature?
The Arkansas sheet lists 120 days to maturity. The other two sources do not give a number, so treat that figure as one source’s estimate.
Do sunchokes need a root barrier?
None of the three sources describes one. The Douglas column recommends a distant, out-of-the-way site, and the NC page warns that any tiny piece left in the soil will sprout. The sources do not give a barrier depth, so this guide does not either.
Why do the sources differ on planting time?
The Douglas column allows fall or early spring, while the Arkansas and NC pages say early spring. Early spring is the one window all three share, which is why this guide treats it as the default.
Sources
- https://www.douglascountymg.org/mg_articles/JerusalemArtichokes2.pdf (opened 2026-10-23)
- https://www.uaex.uada.edu/publications/PDF/FSA-6088.pdf (opened 2026-10-23)
- https://plants.ces.ncsu.edu/plants/helianthus-tuberosus/common-name/sunroot (opened 2026-10-23)
