Signs Potatoes Are Ready to Harvest

Knowing the signs that potatoes are ready to harvest helps you lift them at the perfect time for the best flavour, texture, and storage quality. Harvesting too early reduces yield, while leaving potatoes too long in the ground increases the risk of damage, rot, and disease. The signs vary slightly depending on whether you are growing early or maincrop potatoes.

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• Seed Potato Collection (Early, First & Second Earlies)
A mixed pack of quality seed potatoes to plant for a steady harvest from early summer through to autumn. Ideal if you want variety in size and maturity times.
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• Potato Grow Bags / Containers
Reusable, breathable bags designed specifically for growing potatoes — great for patios, small gardens, or increasing yield in limited space.
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• Potato Fertiliser / Soil Booster
Specially formulated feed to support healthy tuber development and improve yields — apply at planting or as a top-dress during the season.
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• Potato Planting Guides & Markers
Helpful tools and guides that take you through planting depth, spacing, and care — plus reusable markers to keep track of different varieties.
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Foliage Changes

One of the clearest signs is a change in the foliage.

• For early potatoes, plants will usually begin to flower while the foliage is still green.
• For maincrop potatoes, the foliage turns yellow, then brown, and eventually dies back completely.

Fully died-back foliage indicates that maincrop potatoes have finished growing.

Flowering Stage

Flowering is a key indicator for early potatoes.

• When potato plants start to flower, tubers are forming and usually large enough to eat.
• This is the ideal time to harvest first and second early potatoes as new potatoes.

Not all varieties flower heavily, so this sign should be used alongside others.

Time Since Planting

Potatoes follow fairly reliable timelines.

• First earlies: 10–12 weeks after planting
• Second earlies: 13–15 weeks after planting
• Maincrop: 18–20 weeks after planting

If your potatoes fall within these timeframes and other signs match, they are likely ready.

Skin Set Test

Skin thickness is a very important sign, especially for storage potatoes.

Gently rub the skin of a potato with your thumb:

• If the skin rubs off easily, the potato is immature and best eaten fresh.
• If the skin stays firm and intact, it has set and is suitable for harvesting and storage.

Maincrop potatoes should always pass the skin set test before lifting.

Tuber Size

You can carefully check tuber size by gently feeling around the base of the plant or lifting one plant to inspect.

• Early potatoes are ready once tubers reach usable size, even if small.
• Maincrop potatoes should be left until they have reached full size.

Avoid repeated digging, as this disturbs roots and reduces quality.

Plant Growth Slowing Down

As potatoes reach maturity, growth slows noticeably.

• Leaves stop producing fresh growth
• Plants look tired or begin to collapse

This is a natural sign that energy has moved from foliage into tubers.

Yellowing Leaves

Yellowing leaves, especially from the bottom of the plant upward, signal maturity.

• For early potatoes, slight yellowing can indicate readiness.
• For maincrop potatoes, widespread yellowing followed by collapse is ideal before harvesting.

Soil Cracking or Lifting

In some soils, you may notice slight cracking or lifting of the soil around the plant base. This can be a sign that tubers have grown to full size beneath the surface.

Weather and Seasonal Timing

Late summer to early autumn is the usual harvest window for maincrop potatoes. If cold, wet weather or frost is forecast and other signs indicate readiness, it is better to harvest slightly early than risk crop loss.

Container-Grown Potatoes

For grow bags and containers:

• Flowering indicates early potatoes are ready
• Died-back foliage and firm skins indicate maincrop readiness

Containers dry and cool faster than ground soil, so timing is often slightly earlier.

Signs Potatoes Are Not Ready Yet

Potatoes are usually not ready if:

• Plants are still growing strongly with lush green foliage
• Tubers are very small
• Skins rub off very easily

In these cases, waiting another week or two improves results.

Final Thoughts

The main signs potatoes are ready to harvest include flowering for early varieties, fully died-back foliage for maincrop, firm skins, slowed growth, and the correct time since planting. By checking several signs together rather than relying on just one, you can harvest at the ideal moment for the best quality and yield.