HOW TO GROW SWEET POTATOES FROM SLIPS

by | Apr 17, 2026

Here’s a simple, no-nonsense guide to growing sweet potatoes from slips—especially tuned for our warm-season conditions around Nashville.

HOW TO GROW SWEET POTATOES FROM SLIPS

Step 1: Get slips ready

You can either buy slips or grow your own.

To grow your own:

Take a healthy sweet potato.

Set it halfway in water or bury it in moist soil.

Keep warm (75–85°F).

In 2–3 weeks, shoots (slips) appear.

When slips are 6–10 inches long:

    • Twist them off
    • Put them in water for about a week until they grow roots

Now they’re ready to plant.

Step 2: Plant at the RIGHT time

This is the biggest mistake people make.

  • Wait until:
    • No frost risk
    • Soil is at least 65°F
  • In your area: usually mid to late May

Sweet potatoes hate cold soil—plant too early and they just sit there or rot.

Step 3: Planting slips

  1. Choose a full sun spot (6–8+ hours)
  2. Use loose, well-drained soil
  3. Plant each slip:
    • Deep—bury the stem up to the top leaves
    • Space 12–18 inches apart
    • Rows 3–4 feet apart

The buried stem forms the potatoes.

Step 4: Help them take off

First 1–2 weeks matter most:

  • Water regularly until established
  • After that: moderate watering (don’t overdo it)

Important:

  • Too much water or fertilizer = lots of leaves, fewer potatoes
  • Avoid high-nitrogen fertilizers

Step 5: Let vines run (or manage them)

  • Vines will spread 6–10 feet
  • You can:
    • Let them sprawl (best yield)
    • Or gently lift vines occasionally to prevent rooting at nodes

Step 6: Growing period

  • 90–120 days of warm weather
  • They LOVE heat—your summers are perfect

Step 7: Harvest

  • Harvest before first frost
  • Signs they’re ready:
    • Leaves start yellowing
    • Time is up (~100 days)

How to harvest:

  • Loosen soil carefully (they bruise easily)
  • Lift tubers gently

Step 8: Cure for sweetness (don’t skip this)

This is what makes them taste good.

  • Keep in:
    • Warm (80–85°F)
    • Humid space
  • For 1–2 weeks

This converts starches into sugars.

Common Mistakes

  • Planting too early (cold soil)
  • Overwatering
  • Too much nitrogen fertilizer
  • Compact soil (misshapen potatoes)

Pro Tips for Bigger Harvests

  • Plant in raised rows or mounds (warmer soil)
  • Use black mulch to heat soil faster
  • Rotate crops yearly to prevent disease
Here are two space-efficient systems that work extremely well for sweet potatoes—one raised bed and one bucket setup. 

OPTION 1: SMALL RAISED BED (HIGH YIELD, LOW MAINTENANCE)

Ideal Size

  • 4 ft wide x 8 ft long x 10–12 in deep
  • This lets vines spill over edges (important for space saving)

Layout (top view)

[ Slip ] [ Slip ] [ Slip ] [ Slip ]

→ vines spill outward over edges →

[ Slip ] [ Slip ] [ Slip ] [ Slip ]

  • Plant 2 rows
  • Space slips 12–18 inches apart
  • Keep center slightly open for airflow

Side view (cross section)

vines spilling over
————————-
/ \
/ loose soil (10–12″) \
/ \
——————————-
native ground (optional)

Why this works

  • Soil warms faster → better tuber formation
  • Loose soil = long, straight sweet potatoes
  • Vines spill out instead of crowding the bed

Pro setup tips

  • Mix:
    • 60% topsoil
    • 30% compost
    • 10% sand or perlite
  • Slightly mound the center (heat boost)
  • Mulch after planting

OPTION 2: 5-GALLON BUCKET SYSTEM (MAX SPACE EFFICIENCY)

Perfect if you want to grow on a patio, driveway, or tight garden.

What you need

  • 5-gallon buckets (food-grade if possible)
  • Drill (for drainage holes)
  • Loose soil mix

Bucket layout (top view grid)

[ B ] [ B ] [ B ]

[ B ] [ B ] [ B ]

Each bucket = 1 slip

Bucket setup (side view)

vines spilling down
↓↓↓↓↓↓↓↓↓
———-
| |
| soil | ← loose, well-drained
| |
| |
|__________|
drainage

Why buckets work

  • Soil heats up fast (sweet potatoes LOVE heat)
  • Easy to control soil quality
  • Great for small spaces or renters

How to plant

  1. Fill bucket with soil mix
  2. Plant slip deep (up to leaves)
  3. Water well to establish

Upgrade: Vertical vine control

Instead of letting vines spread everywhere:

Option A: Let them cascade

  • Place buckets along edges
  • Vines spill down naturally

Option B: Train upward (tidier)

trellis
↑
|
🌿 | 🌿
\ | /
\ | /
[ B ]
  • Use a tomato cage or simple stake system

Which should you choose?

If you want… Choose
Bigger harvest Raised bed
Smallest footprint Buckets
Less watering Raised bed
Mobility Buckets