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How to grow sweet potatoes

Frost-tender · Morning glory family

When to sow and plant

  • Plant out 6–20 May

Frost-tender: everything 17 days later, so it only goes outside once there is no frost in 9 out of 10 years.

Based on: average for Germany, last frost 19 April, safe from 6 May

Planting calendar for your area
Where the dates come from

The weeks come from our sources; the dates use the average frost in Germany. Enter a German postcode to get dates for your area.

  • Plant out: 0–2 weeks after the last frost (USU Extension: How to Grow Sweet Potatoes in Your Garden)

Good and bad neighbours

We don’t know any sourced neighbours for this plant yet.

Crop rotation

Our sources give no separate break for this family.

  • The same species should go back to the same spot after a break of 3 years at the earliest.
  • Example: grown here in 2026, again from 2030.

At a glance

Family
Morning glory family (Convolvulaceae)
Frost
Tender to frost
Spacing (row × plant)
91–122 × 30 cm (36–48 × 12 in)
Plants per m²
3.7
Per square foot (30 × 30 cm)
1 plant
Life cycle
Annual
Harvest
After 85–120 days

Spacing according to USU Extension: How to Grow Sweet Potatoes in Your Garden. Other sources: – × 30 cm (– × 12 in) (RHS: How to grow sweet potatoes).

Questions and answers

When can I plant out sweet potatoes?

Plant out, average for Germany: 6–20 May. That is the date after which there is no frost in 9 out of 10 years. Enter a German postcode above for your area, or your own frost date in the planting calendar.

How far apart should I plant sweet potatoes?

91–122 × 30 cm (36–48 × 12 in) (row × plant), according to USU Extension: How to Grow Sweet Potatoes in Your Garden.

How long a break do sweet potatoes need in the same bed?

Our sources give no separate break for this family. The same species should go back to the same spot after a break of 3 years at the earliest.

Sources

Show 6 sources
  1. RHS: How to grow sweet potatoes
  2. University of Maryland Extension: Growing Sweet Potatoes in a Home Garden
  3. USU Extension: How to Grow Sweet Potatoes in Your Garden
  4. Phipps Conservatory and Botanical Gardens: Square Foot Gardening Guide (2020)
  5. Landwirtschaftskammer Schleswig-Holstein: Fruchtfolge im Garten (Gartenmerkblatt, 2020)
  6. GBIF Backbone Taxonomy (über die GBIF-API, species/match)

Retrieved on 23 October 2026. Facts in our own words, one source per value.