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Regional field-trial overview · Spain

Growing sweet potatoes in Spain

The Spain-wide climate point is centered far from the sweet-potato planting-date experiment in Moncada, Valencia. The local guide shows the tested May, June and July dates beside climate data for the trial location.

Moncada · Valencia trial location

Growing for a home garden? See the general sweet potato guide.

Sweet potato field rows prepared for planting

Regional crop context

Sweet potatoes in Spain

A Ministry-hosted IVIA field experiment in Moncada compared planting dates, cultivars, commercial yield and root size.

The dates come from a 2005 Valencia experiment published in 2006; they do not represent all Spanish climates or a current national calendar.

Step 1 of 7 · Assess

Check the field and production system before ordering slips

Coordinate clean slip supply, field preparation, planting water, setter capacity, weed control and digging space before committing acreage.

6 topics still to verify· planning aid only, not a suitability score

Local crop-planning checks

Walk low spots after rain. Confirm the bedder can make stable rows and that water can leave the field.

Not reviewed

Check previous sweet potato, grass or pasture history, nematode results, wireworm pressure and known disease patches.

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Confirm variety, slip quantity, delivery date, setter capacity, water at planting and a plan for keeping slips shaded before setting.

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Match variety and expected root size to the buyer’s fresh-market or processing specification, delivery timing and grading equipment.

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Confirm curing-room volume, airflow, pallet-bin handling and storage space before planting the acreage.

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Map the crop sequence and equipment-cleaning route so infested soil and plant material do not move between fields.

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Selections stay in this browser tab and are not saved or sent anywhere.

Need a field-specific review? Run a coordinate-level farm audit for localized conditions.

Read the field history before selecting slips

Root-knot nematodes, wireworms and other soilborne pests affect marketable roots. Soil sampling, clean planting material, crop rotation and equipment sanitation are the first decisions; chemical treatment depends on current field results and product labels.

Step 2 of 7 · Plan

Choose a transplant window in Spain

Open the Moncada guide to compare the exact experimental dates and the local climate profile.

Moncada · Valencia

The IVIA study tested three planting dates and measured commercial yield and root size by cultivar.

Planting reference: 19 May · 17 June · 11 July · field-trial dates

View local climate and growing guide

Step 3 of 7 · Prepare

Build an aerated bed and keep the crop sequence clean

Sweet potatoes develop best in a loose, well-drained root zone. Shape beds to the field soil and drainage pattern, and keep saturated ground out of the planting plan.

The bed does several jobs

  • Improves aeration and drainage around developing roots.
  • Warms the crop zone for a warm-season transplant.
  • Gives the setter and digger a consistent row to follow.

Keep bed height and shape consistent with soil texture, water movement and the equipment used on the farm.

Cross-section of a crowned sweet potato bed with arrows showing surface runoff moving down the shoulders.
A crowned, loose bed gives developing roots an aerated zone and can shed surface water down its shoulders. Shape the row for field soil, drainage and equipment; schematic, not to scale.

Set fertility from the field test

Base pH and fertilizer rates on representative soil tests. Avoid excess nitrogen, which can favor vine growth over marketable storage-root sizing.

Step 4 of 7 · Establish

Plant slips, not seed, and calculate the stand

Sweet potatoes are established from vegetative vine cuttings called slips. Buy clean, healthy slips in the target variety and quantity, and keep them shaded and moist until planting.

Sweet potato slip set diagonally with its shoot and leaves above the soil, at least three buried nodes, new roots and a 3–4 inch depth mark.
Set the slip so at least three nodes sit below the soil while the growing tip and leaves remain above. The 3–4 inch (7.6–10.2 cm) depth is a practical guide; node position is the key. Leaf shape varies by cultivar. Water after transplanting.

Regional starting pattern

Between rows
110 cm (trial pattern)
Within row
40 cm (trial pattern)
Transplant depth
3–4 in (7.6–10.2 cm), with at least three nodes covered

The Moncada trial used 1.1 m between rows and 40 cm between plants. The calculator uses that tested pattern as its default and provides a bounded planning range.

Planting calculator

Estimate slips for your field

Spacing-based count

Estimated slips

22,727

at 110 × 40 cm

Estimate = field area ÷ row-by-slip spacing. Keep values within the published bounds, then match the starting pattern to equipment and target root grade. Headlands and replant allowance are not included.

Step 5 of 7 · Manage

Protect the establishment period and the root grade

The first weeks determine how evenly slips establish and how the crop competes. Protect the crop from early weed competition and scout for wireworms, flea beetles and root-knot nematodes. Use field history, clean planting material and equipment sanitation to reduce avoidable risk.

Get water onto the slip at planting

Water immediately after setting and maintain enough moisture for root establishment. Track rainfall and soil moisture; avoid keeping beds saturated.

Keep the field clean while the crop closes rows

Scout early and maintain a weed-free start through canopy closure. Choose current control methods for the farm’s production system.

Scout below the canopy as well

Wireworms, flea beetles and root-knot nematodes can downgrade roots. Keep field history and scouting records tied to each harvest lot.

Keep tools and planting stock clean

Use certified or otherwise clean slips, avoid carrying soil on slips, and clean equipment after infested fields to limit movement of nematodes and soilborne disease.

Step 6 of 7 · Harvest

Dig at the planned size, cure quickly and protect the skin

Use the cultivar-specific trial results to weigh planting date against marketable root size. Set harvest timing to the planned grade and avoid frost exposure.

A tractor lifting sweet potatoes during field harvest
At harvest, protect the skin and move roots promptly to curing; equipment and handling systems vary by region.

Harvest period

Plan from the trial date and cultivar maturity; the study assessed commercial roots at harvest.

Plan by variety, market size, planting date, field condition and frost risk.

Cure

80–85°F · 85–90% RH

A crop-level curing reference is 7–10 days with airflow; use the facility and buyer protocol for the harvested lot.

Store

55–60°F · about 85% RH

Maintain stable temperature, humidity and ventilation after curing.

Step 7 of 7 · Reference

Evidence behind the Spain guide

View references (5)
  1. 1. MAPA / IVIA — Fechas de plantación de boniatoPublished 2006; field experiment in 2005

    Moncada, Valencia planting dates of 19 May, 17 June and 11 July, commercial yield and root-size results, and 1.1 × 0.4 m spacing.

  2. 2. Szarvas et al. — The effect of plant density on the yield of sweet potatoPublished 23 May 2019; three field seasons in southeast Hungary

    European field trial comparing 80 × 20, 80 × 30, 100 × 20 and 100 × 30 cm row-by-plant spacing. Used as a crop-level spacing reference, not a local calendar.

  3. 3. Washington State University Extension — Sweetpotato Production PracticesPublished January 2026

    Crop-level soil-temperature context, bed preparation, equipment-led row spacing and the relationship between plant density and root size.

  4. 4. University of Missouri Extension — Growing Sweet PotatoesReviewed March 2026; originally published September 2017

    Crop-level transplant establishment, slips, frost sensitivity and raised-bed practice. Missouri calendar dates are not applied to other regions.

  5. 5. Texas A&M AgriLife — Sweet Potato commercial crop profileOlder technical profile; undated PDF

    Shared crop-level reference for curing and storage conditions. Its Texas planting calendar is used only on the Texas page.

Photo authorship and licence information are recorded centrally. View photo credits.

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