How Deep to Plant Potatoes

Planting potatoes at the correct depth is essential for strong growth, good yields, and healthy tubers. Plant too shallow and potatoes can turn green or dry out; plant too deep and growth may be slow. The ideal depth depends slightly on how and where you are growing them, but the basic rules are simple.

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Standard Potato Planting Depth

For most garden situations in the UK:

• Plant seed potatoes 10–15 cm (4–6 inches) deep

This depth allows:

• Good root development
• Protection from light
• Strong shoot growth
• Easy earthing up as plants grow

This depth applies to first earlies, second earlies, and maincrop potatoes.

Does Potato Type Change the Depth?

The planting depth stays broadly the same for all types:

• First early potatoes: 10–15 cm
• Second early potatoes: 10–15 cm
• Maincrop potatoes: 10–15 cm

What changes between types is spacing, not depth.

How Deep to Plant Potatoes in Trenches

If planting in traditional trenches:

• Dig trenches 10–15 cm deep
• Place seed potatoes in the bottom with shoots facing upwards
• Cover lightly with soil

As plants grow, soil is gradually drawn back in during earthing up.

How Deep to Plant Potatoes in Raised Beds

In raised beds:

• Plant seed potatoes 10–15 cm below the soil surface
• Raised beds often drain better and warm faster, which helps early growth

Ensure there is enough soil depth overall to allow for earthing up.

How Deep to Plant Potatoes in Containers or Grow Bags

For containers:

• Start with 10–15 cm of compost covering the seed potatoes
• Leave space at the top of the container
• Add more compost as plants grow (earthing up)

Do not fill containers to the top at planting time.

Why Correct Planting Depth Matters

Planting at the right depth:

• Prevents tubers from turning green
• Reduces risk of frost damage
• Helps retain moisture around roots
• Encourages stronger, healthier plants

Shallow planting often leads to exposed or misshapen potatoes.

Can You Plant Potatoes Too Deep?

Yes. Planting potatoes deeper than 20 cm can:

• Delay shoot emergence
• Reduce early growth
• Increase the risk of rotting in cold, wet soil

It is better to plant at the correct depth and rely on earthing up later.

Can You Plant Potatoes Too Shallow?

Planting too shallow can cause:

• Green potatoes from light exposure
• Reduced yields
• Greater risk of drying out
• Poor tuber development

If potatoes are planted too shallow, earthing up early can help correct the problem.

Soil Type and Planting Depth

• Light, sandy soil: Stick to 10–12 cm
• Heavy clay soil: Plant closer to 10 cm and ensure good drainage
• Well-prepared soil: Full 15 cm depth works well

Avoid planting deeply in cold, waterlogged soil.

Should You Adjust Depth for Chitted Potatoes?

No major adjustment is needed.

• Plant chitted potatoes at the same depth
• Handle carefully to avoid snapping shoots
• Position shoots facing upwards

Quick Depth Summary

• Ideal depth: 10–15 cm
• Too shallow: Less than 8 cm
• Too deep: More than 20 cm

Best Practice Tips

• Always measure depth from the soil surface
• Keep planting depth consistent
• Earth up regularly as plants grow
• Check soil moisture before planting

Final Tip

Planting potatoes at the correct depth sets the foundation for the entire growing season. Combine proper depth with good spacing, earthing up, and watering, and you’ll give your potatoes the best possible start.