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You know potatoes are ready to pick when the plant’s foliage begins to yellow and die back, signaling that the tubers have matured underground.
But the exact timing depends on whether you’re harvesting new potatoes for immediate meals or mature potatoes for long-term storage.
In this post, we’ll walk you through the clear signs that potatoes are ready to pick, how to test your soil for clues, and the best way to harvest without damaging your crop.
Let’s dig into the details so you never pull up spuds too early or leave them in the ground past their prime.
Key Signs That Potatoes Are Ready to Pick
Potatoes are ready to pick when the above-ground growth tells you so, and here’s the breakdown of what to look for.
1. The Foliage Starts to Yellow and Flop
The most reliable sign that potatoes are ready to pick is when the leaves begin turning yellow and the stems start to droop.
This natural die-back is the plant’s way of saying that the energy has moved from the leaves down into the tubers.
For early or “new” potatoes, you don’t have to wait for full yellowing, just pick them when the plants begin flowering.
But if you want storage potatoes, wait until about two to three weeks after the foliage has completely died back.
That extra time helps the skins thicken, which prevents bruising and rot during storage.
2. Check the Calendar for Your Variety
Potatoes are ready to pick according to a timeline based on whether they’re early, mid-season, or late varieties.
Early potatoes are usually ready to pick about 60 to 90 days after planting, while maincrop varieties take 100 to 130 days.
If you’ve lost track of your planting date, count the weeks from when the plants emerged, not from when you put the seed potatoes in the ground.
This calendar method is a great backup, especially if your foliage looks lush but you suspect the tubers aren’t fully mature yet.
3. Do a Test Dig to Confirm Readiness
If you’re unsure whether potatoes are ready to pick, gently dig around the base of one plant with your hands or a garden fork.
Feel the skins on a few tubers, if they rub off easily with your thumb, they’re new potatoes and perfect for eating right away.
If the skins are firm and set, then those potatoes are ready to pick for storage.
Don’t dig up the whole plant for this test, just lift one side and you’ll get a clear picture of how the rest are developing.
4. Watch the Weather and Soil Conditions
Potatoes are ready to pick more quickly in warm, dry soil, but they’ll slow down if the ground is cold or waterlogged.
Aim to harvest when the soil is slightly moist but not muddy, as wet conditions make it harder to brush off dirt and increase the risk of rot.
If a heavy frost is forecast, that’s a strong signal that potatoes are ready to pick, as cold damage can ruin tubers left in the ground.
Keep an eye on the forecast and prioritize harvest if night temperatures are dipping near freezing.
How to Tell If Potatoes Are Ready to Pick for New vs. Storage
Potatoes are ready to pick for different purposes at different stages, so let’s separate those two scenarios clearly.
New Potatoes: Pick Them Early
New potatoes are ready to pick about two to three weeks after the plants first flower.
At this stage, the skins are very thin and delicate, and the flesh is moist and sweet, perfect for boiling or salads.
You’ll know they’re new potatoes when the skins rub off easily and the tubers are small, usually around the size of a golf ball.
Harvest them as you need them, since new potatoes don’t store well and should be eaten within a few days.
Storage Potatoes: Wait for Full Maturity
For potatoes you plan to keep for months, they’re ready to pick only after the foliage has died back completely and the skins are tough.
This mature stage usually occurs about two to three weeks after full die-back, and the skin won’t scrape off when you rub it.
Pick them on a dry day, and then cure them in a cool, dark, ventilated spot for about two weeks before moving to storage.
This curing process heals any small cuts and further hardens the skins, which is essential for long-term keeping.
Common Mistakes That Make Potatoes Not Ready to Pick
Sometimes potatoes aren’t ready to pick simply because of a few avoidable errors on your part.
1. Harvesting Too Early
If you dig up potatoes and the skins are as thin as paper, you’ve harvested too early, those are fine for immediate use but won’t store.
Potatoes not ready to pick for storage will have skins that peel off with a fingernail scrape.
Wait an extra couple of weeks next time and you’ll see the difference in firmness and keepability.
2. Overwatering Before Harvest
Too much water in the final weeks can cause potatoes to grow cracks, which invite disease and rot.
Potatoes are ready to pick better when you ease off on watering about two weeks before you plan to harvest.
This lets the skins firm up and reduces the moisture content in the tubers, improving their storage life.
3. Leaving Them in the Ground Too Long
If the foliage has died and you leave potatoes in wet soil, they may start to rot or sprout.
Potatoes are ready to pick and should come out of the ground as soon as you’re confident they’ve matured, don’t wait for perfection.
A soil temperature above 50°F can also trigger secondary growth, which makes the spuds knobby and less tasty.
How Do You Know When Potatoes Are Ready to Pick? Final Tips
You know potatoes are ready to pick when the plant’s foliage has yellowed and died, the skins are firm, and a test dig confirms the size you want.
Remember that new potatoes come early and are for immediate eating, while storage potatoes need full maturity and curing.
Check the variety’s days-to-maturity as a timeline guide, and always trust the test dig over guesswork.
Harvest on a dry day, use a fork carefully to avoid spearing tubers, and let them dry on the soil surface for an hour before gathering.
Potatoes are ready to pick when you feel that satisfying heft of a full-sized spud in your hand, and you’ll get better with each season.
So whether you’re a first-time grower or a seasoned pro, watching those signs will ensure you pull up a perfect harvest every time.
Happy digging, and here’s to a pantry full of homegrown spuds that you picked at exactly the right moment.