Sweet potatoes are one of the most rewarding crops we grow at Paradiso Farm.

For us, they are forgiving, productive, and when planted the right way...

This guide walks through exactly how we do it, so you can understand or replicate our method.

Why Sweet Potatoes?

If we talk about regular potatoes, which grow from cut tubers, sweet potatoes are propagated from slips.

I mean, young shoots grown from a mature sweet potato root.

This distinction shapes everything about how we plant them.

When you get the slip stage wrong, and then the whole season suffers.

When you get it right, then you set yourself up for vigorous vines and heavy yields by harvest time.

At Paradiso Farm, we treat slip production and transplanting as two halves of the same careful process, not separate afterthoughts.

Selecting the Mother Roots

For us, everything starts about eight to ten weeks before our planned transplant date.

We select healthy, disease-free sweet potato roots from our own previous harvest or from a trusted certified source.

Also, we avoid roots with soft spots, blemishes, or signs of rot, since any weakness in the mother root can carry through to the slips.

We also noticed that medium-sized roots tend to sprout more evenly than very large ones, so we favor those for slip production.

Growing the Slips

We use two main methods for sprouting slips, depending on the season and how many plants we need...

Water method: For smaller batches, we suspend the sweet potato root halfway in a jar of water, using toothpicks to hold it in place. 

Within a few weeks, roots develop underwater while shoots emerge above the waterline.

Soil bed method: For our main production, we prefer the soil bed method. 

We lay the mother roots in a shallow tray or bed filled with moist, loose potting mix or sand, covering them about half to two-thirds with the growing medium and leaving the top exposed.

This bed is kept warm ideally using a sunny greenhouse or a covered cold frame in cooler months.

Consistent warmth is the single biggest factor in strong slip production...

Because sweet potatoes are a warm-season crop through and through, and slow, uneven sprouting is almost always a sign that the bed is too cool.

We keep the soil consistently moist but never waterlogged, since soggy conditions invite rot before shoots even have a chance to form.

Within three to four weeks, small purple-green shoots begin pushing up from the root.

We let them grow to six to twelve inches tall before harvesting them as slips.

Harvesting the Slips

When the shoots reach the right size, we twist or cut them away from the mother root just above the soil line.

Each slip typically comes with a small cluster of root nubs where it separates.

We're careful not to include any of the actual mother root tissue in this cut, since transplanting whole root pieces increases the risk of soil-borne disease carrying into the new planting bed one of the real advantages of the slip method over tuber propagation.

After cutting, we place the slips in a jar of water for a few days, letting them develop a short web of white roots.

This step, sometimes called rooting the slips, dramatically improves transplant success.

When your Slips planted bare, without this rooting period, it tends to wilt and take longer to establish.

We only plant slips once we see healthy root growth of half an inch or more.

Preparing the Field

While the slips are rooting, we turn our attention to the field itself.

Sweet potatoes are particular about their growing conditions in a few key ways, and we plan our bed preparation around them.

Soil type: We aim for loose, well-draining, slightly sandy loam. Heavy clay soils restrict root expansion and often produce misshapen or stunted tubers, so in our clay-heavier plots, we amend generously with aged compost and coarse organic matter to improve texture and drainage.

Soil pH: We test our soil each season and aim for a slightly acidic range, roughly 5.5 to 6.5. If needed, we adjust with sulfur or lime well ahead of planting to give amendments time to take effect.

Raised mounds or ridges: This is one of the defining features of how we plant at Paradiso Farm. Rather than planting on flat ground, we build raised mounds or long ridges of soil, typically eight to twelve inches high and about three feet apart, center to center. 

These ridges warm up faster in spring, drain excess moisture away from the root zone, and give the developing tubers loose soil to expand into without obstruction.

We form these ridges with a hoe or a small tiller attachment, shaping the soil into a rounded, slightly flattened crown along the top.

Fertility: Sweet potatoes don't need heavy feeding, and in fact, too much nitrogen encourages vines at the expense of root development. 

We work a modest amount of balanced, low-nitrogen fertilizer or well-finished compost into the ridge before planting, favoring potassium and phosphorus over nitrogen.

Timing the Planting

Sweet potatoes are unambiguously a warm-weather crop.

We never rush this step.

And planting too early into cold soil stalls root development and can cause slips to rot outright before they establish.

At Paradiso Farm, this generally means we don't transplant until two to three weeks after our last expected frost date, once both the air and the ground have properly warmed.

Transplanting the Slips

We plant slips along the top of each ridge, spacing them roughly twelve to eighteen inches apart within the row.

This spacing gives each plant enough room to develop a full root system without excessive competition, while still making efficient use of the ridge.

To plant, we push a finger into the ridge to create a hole about three to four inches deep, angled slightly rather than straight down.

We insert the slip so that at least two or three leaf nodes are buried beneath the soil line, leaving only the top two or three leaves exposed above ground.

Plus, burying multiple nodes matters because sweet potato roots can form at each buried node, meaning a well-planted slip has the potential to produce more tubers than one planted too shallowly.

After placing the slip, we firm the soil gently around the stem to remove air pockets and water each one in immediately. This initial watering is essential even a few hours of wilting in hot sun can set a young slip back significantly.

We try to transplant in the late afternoon or on an overcast day when possible, giving the slips a cooler window to recover before facing full sun.

Early Care After Planting

For the first one to two weeks, we keep a close eye on soil moisture, watering deeply every few days if rainfall is insufficient, since this establishment period is the most vulnerable stage for the young plants.

Once the slips show new growth usually within seven to ten days we know root establishment has succeeded.

We avoid heavy watering later in the season...

Sweet potato vines are naturally drought-tolerant once established, and overwatering in the weeks before harvest can actually reduce storage quality and encourage splitting.

We taper irrigation gradually as the season progresses, relying more on natural rainfall and less on supplemental watering.

Plus, weed control matters most in the first month, before the vines spread and shade out competition on their own.

We hand-weed carefully around each plant during this window, then let the sprawling vines take over as natural ground cover for the rest of the season