Last Updated on October 9, 2026

How Many Sweet Potato Plants per Square Foot?

One sweet potato slip per 4 square feet: a 2 x 2 foot block with the slip in the center, so plants sit 24 inches apart. That is University of Maryland Extension’s spacing for a wide bed. The row spacing in the extension guides on this page works out to one plant per 2 to 6 square feet, so none of them puts even one sweet potato in a single square. That count is for vines left to run across the bed; training them up a trellis instead fits more in less ground, covered below.

Sweet potato spacing in a square foot garden

Those counts are grid maximums for a bed of only sweet potatoes, and they assume the vines can run out over the edge. Mississippi State Extension notes that planting slips farther apart often gives an earlier harvest or larger sweet potatoes.

Why sources disagree on sweet potato spacing

Answers run from 4 plants per square foot to one plant per 6 square feet. Five things explain the gap.

1. Row spacing hides the aisle

Extension guides give an in-row distance (8 to 18 inches), which alone looks like one plant per square, and a separate row width. Multiply the two for the real ground per plant:

The last column is plain arithmetic: 12 inches x 36 inches is 432 square inches, or 3 square feet. A raised bed has no aisles between rows, so the 2 x 2 foot block sits inside that range, on the roomy side of it.

2. Vining types vs bush types

Utah State Extension says sweet potatoes “can have long vines, but many compact bush varieties now exist,” and lists Bush Porto Rico and Vardaman Bush. Clemson HGIC calls Vardaman bush-type and Murasaki a vigorous vine that grows 20 feet. None of these guides gives a tighter spacing for bush types, so keep the 2 x 2 block. A bush type just keeps more of its vine inside it.

3. You count slips, not sweet potatoes

Sweet potatoes are not grown from seed or from cut pieces like regular potatoes, which go 2 per square. Mississippi State Extension explains that you plant slips: stem-tip cuttings grown from sprouted storage roots saved from last year. Each slip becomes one plant. Young storage roots start forming within the first two weeks of planting and keep growing from there. Expect 1 to 2 pounds of roots per plant by harvest (Utah State Extension). The count on this page is slips.

4. The “yams” on my chart

My square foot gardening chart has a yams row at 4 per square, and the square foot garden calculator uses the same number. Utah State Extension says moist-fleshed sweet potatoes are often called “yams,” but they are not true yams, which belong to a different plant family. University of Maryland Extension names Georgia Jet, Centennial and Vardaman among them. So the orange “yams” you grow are sweet potatoes, and 4 per square (6 inches apart) is far tighter than every guide above. Use the 2 x 2 block.

5. Training vines up instead of letting them run

Square Foot Gardening plants sweet potatoes four to a square and trains the vines up a trellis, or uses a “Top Hat box” (a 1 x 1 foot box, 6 inches deep, set on top of one square) to give the roots extra depth. That is one plant per 0.25 square feet, far tighter than the one plant per 4 square feet on this page, because the vines go up instead of running across the bed. The 2 x 2 count here is for vines left to run, which needs no trellis or box; train them vertically and you can plant tighter.

Planting the square

1. Pick a 2 x 2 foot block on the bed edge, in full sun, where the vines can run out over the side. Mississippi State Extension wants at least 8 hours of direct sun.
2. Wait until all danger of frost has passed and the soil 4 inches down is at least 65°F, South Dakota State Extension’s mark.
3. Set one slip in the center of the block, 3 to 4 inches deep (Clemson HGIC).
4. Water right away and keep the soil evenly moist for the first two weeks, then give about 1 inch of water a week (Mississippi State Extension).
5. Stick a flag or marker next to each plant so you know where to dig later, a tip from University of Maryland Extension.
6. Guide the vines over the edge or up a trellis. University of Maryland Extension says vines can be trimmed back 20 to 30 percent without significantly reducing the harvest.

When to plant sweet potato slips

Sweet potatoes go in after your last spring frost. Clemson HGIC says they are not planted until well after the last chance of frost, with the soil above 65°F. The guides here set the date by soil temperature, not by a fixed number of weeks, so a soil thermometer makes the final call. Find your last frost date by zip code on Plan My Garden, then start checking the soil once that date has passed.

Digging and curing

Clemson HGIC digs when 30 percent of the roots are larger than 3½ inches across, before frost, because cool soil lowers quality and storage life. If frost does kill the vines, University of Maryland Extension says to dig right away, since decay in the dead vines moves into the roots. Then cure them: my sweet potato curing guide covers the next step: about 85°F and 85-90% humidity for 4 to 7 days, then storage at 55-60°F.

Where to get slips

Wood Prairie sells certified organic sweet potato slips in four varieties: Beauregard, Purple Majesty, Bayou Belle and Covington, which its page calls shorter-season sweet potatoes. Code PMG5 takes 5 percent off. To grow your own, South Dakota State Extension says to choose organically grown sweet potatoes, since store-bought ones are often treated to prevent sprouting.

Quick questions

How many sweet potato plants fit in a 4×8 raised bed?

Up to 8, one slip per 2 x 2 foot block, if the vines can run out over the edges. University of Maryland Extension spaces sweet potatoes 2 feet apart in each direction in a wide bed.

How many sweet potato slips per square foot?

Less than one. Plant one slip per 4 square feet, a 2 x 2 foot block. The row spacing in the extension guides on this page works out to one plant per 2 to 6 square feet.

How many sweet potatoes does one plant produce?

Expect 1 to 2 pounds of roots per plant (Utah State Extension), or about 2 pounds from a hill (University of Missouri Extension). Variety makes a difference.

How many sweet potato plants per person?

Figure about 5 plants per person for fresh eating (Virginia Cooperative Extension), or 5 to 10 slips per person if you want extra for storage too (Utah State Extension).

Can you grow sweet potatoes in a container?

Yes. Jon Traunfeld of University of Maryland Extension usually suggests one plant in a 10-gallon container, and fabric bags work too. He also mentions a co-worker who got about 5 pounds of sweet potatoes from a 5-gallon bucket.

Let the planner place them

If working out blocks and vine room by hand feels like a lot, Plan My Garden is free to start: enter your zip code, draw your beds, pick your crops, and it places each plant at square-foot spacing with a planting schedule built from your frost dates.

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