For “when to dig up potato plants”: Dig up potatoes two weeks after the foliage turns yellow and dies back completely. This simple timing rule helps you harvest spuds at their peak flavor and storage quality. Many gardeners guess wrong and end up with tiny or rotten potatoes. Let’s fix that today.
Potatoes are forgiving crops, but timing matters more than you might think. Dig too early and you get thin-skinned, small tubers that won’t store. Dig too late and rot or pests ruin your harvest. The sweet spot is clear once you know what to look for.
When To Dig Up Potato Plants
The exact moment to harvest depends on your potato variety and your local climate. But the universal sign is the plant’s foliage. When the leaves turn yellow, then brown, and finally flop over, the potatoes beneath are maturing. Wait two full weeks after the stems die back completely before digging.
This waiting period allows the skins to thicken. Thick skins mean longer storage and less bruising. If you dig immediately after the leaves die, the skins are paper-thin and will peel off during handling. Those potatoes won’t last a month in storage.
Why Foliage Color Matters
The green leaves are the plant’s solar panels. They send energy down to the tubers. When the leaves yellow and die, that energy transfer stops. The potatoes then enter a curing phase where the skins set. This natural process is your best indicator.
Don’t rush to dig just because the leaves look a little tired. Wait until at least 70% of the foliage has turned yellow or brown. Then start your two-week countdown. If you dig during the yellowing phase, the potatoes will be edible but won’t store well.
Checking Soil Moisture Before Digging
Dry soil makes digging easier and cleaner. If the ground is wet, the potatoes will be muddy and more prone to bruising. Wait for a few days of dry weather before you start. If rain is forecast, dig a day or two before it arrives, as long as the foliage has died back.
Wet potatoes also rot faster in storage. So timing your dig around dry conditions is just as important as the plant’s stage. Check the forecast and plan accordingly.
Signs Your Potatoes Are Ready To Harvest
Beyond the foliage, there are other clues that your potatoes are mature. These signs work for both early and maincrop varieties. Use them together for the best results.
Flower And Fruit Indicators
Potato plants sometimes produce small green fruits that look like tiny tomatoes. These fruits appear after flowering. Once the fruits form and the flowers fade, the tubers are bulking up underground. But don’t rely solely on flowers; some varieties rarely bloom.
If your plants do flower, wait until the flowers have died and the fruits start to soften. That is a good sign the potatoes are nearing maturity. But always check the foliage as your primary guide.
Skin Set Test
Gently brush away soil from the base of a plant. Expose a few tubers without pulling them out. Rub the skin with your thumb. If the skin rubs off easily, the potatoes are not ready. If the skin stays firm and doesn’t peel, they are mature.
This test is quick and reliable. Just be gentle when uncovering the tubers. Use your hands, not a tool, to avoid damaging them. If the skins are still thin, cover them back with soil and wait another week.
Size And Variety Expectations
Potato size depends on variety, spacing, and growing conditions. New potatoes can be harvested early, but maincrop potatoes need the full season. If you planted a variety that matures in 90 days, don’t expect huge tubers at day 70.
Check the seed packet or plant tag for the expected days to maturity. Add two weeks after the foliage dies to that number. That gives you a rough window. But always trust the plant’s appearance over the calendar.
How To Dig Up Potatoes Without Damaging Them
Digging technique matters almost as much as timing. A damaged potato is an open door for rot and disease. Use the right tools and method to keep your harvest intact.
Tools You Will Need
- A garden fork or spading fork (not a shovel)
- A wide trowel for tight spots
- A bucket or basket for collecting
- Gloves to protect your hands
- A brush for cleaning off loose soil
A garden fork is better than a shovel because it lifts the soil without cutting tubers. Shovels slice through potatoes easily. Forks loosen the soil and let you gently lift the whole clump.
Step-By-Step Digging Process
- Cut back the dead foliage to about 2 inches above the soil. This clears the area and removes any disease spores.
- Insert the garden fork about 12 inches away from the plant base. Angle it slightly away from the plant to avoid spearing tubers.
- Push the fork deep into the soil, then gently lever it upward. Lift the soil clump slowly.
- Shake the clump gently to expose the potatoes. Pick them out by hand.
- Repeat around the plant in a circle, working outward. Potatoes can spread far from the main stem.
- Check the soil for any missed tubers. Small ones left behind will sprout next year as weeds.
Work slowly and methodically. Rushing leads to cut or bruised potatoes. If you hit a tuber with the fork, set it aside for immediate eating, not storage.
Handling New Potatoes Vs. Storage Potatoes
New potatoes are harvested early, before the skins set. They are thin-skinned and delicate. Dig them carefully and eat them within a few days. They don’t store well at all.
Storage potatoes need the full two-week wait after foliage death. Their skins are tough and protect the flesh. Handle them gently anyway, but they can withstand more handling than new potatoes.
Curing And Storing Your Harvest
After digging, the potatoes need to cure before long-term storage. Curing heals small cuts and thickens the skins further. Skip this step and your potatoes will shrivel or rot.
How To Cure Potatoes
- Spread the potatoes in a single layer in a dark, well-ventilated area.
- Keep the temperature between 50-60°F (10-15°C).
- Maintain high humidity, around 85-90%.
- Leave them for 10-14 days.
- Do not wash them before curing. Dirt protects the skins.
A garage, basement, or shed works well if it stays cool and dark. Avoid direct sunlight, which turns potatoes green and toxic. After curing, brush off the loose soil gently.
Storage Conditions For Longevity
Once cured, store potatoes in a cool, dark, humid place. Ideal temperature is 40-50°F (4-10°C). Do not refrigerate, as cold converts starch to sugar and alters flavor.
Use perforated bags, cardboard boxes, or wooden crates. Avoid plastic bags that trap moisture. Check stored potatoes weekly and remove any that show signs of rot or sprouting.
Common Mistakes When Digging Potatoes
Even experienced gardeners make errors. Here are the most frequent ones and how to avoid them.
Digging Too Early
Impatience is the biggest mistake. You see yellow leaves and think it’s time. But the potatoes need those two extra weeks for skin set. Digging early gives you thin-skinned, low-yield potatoes that won’t store.
If you absolutely must have new potatoes, harvest a few from the edge of the row. Leave the rest to mature. That way you get both early treats and a storage crop.
Digging In Wet Soil
Wet soil clings to potatoes and makes them muddy. Cleaning wet potatoes damages the skins. Plus, wet conditions promote rot during curing. Always wait for dry soil if possible.
If rain is unavoidable, dig anyway and cure the potatoes in a dry, airy space. Brush off as much mud as you can without washing. The curing process will dry the rest.
Leaving Potatoes In The Ground Too Long
While waiting is good, waiting too long is bad. If the ground freezes, potatoes can be damaged. Also, pests like wireworms and voles will find them. Dig within a month of the foliage dying.
If you cannot dig right away, at least remove the dead foliage to reduce disease pressure. Then dig as soon as conditions allow. Do not leave them overwinter unless you live in a very mild climate.
Special Considerations For Different Potato Types
Not all potatoes mature at the same time. Knowing your variety helps you plan the harvest.
Early Or New Potatoes
Early varieties mature in 60-80 days. Harvest them when the plants are still flowering or just starting to yellow. The skins are thin and the flavor is delicate. Eat them within a week.
For early potatoes, you don’t need to wait for full foliage death. Dig a test plant to check size. If the tubers are big enough, harvest the whole row. They won’t store, so enjoy them fresh.
Maincrop Potatoes
Maincrop varieties take 90-120 days. These are your storage potatoes. Wait for the foliage to die completely, then add two weeks. Their thick skins make them ideal for winter storage.
Examples include Russet, Yukon Gold, and Kennebec. These need the full season to develop size and flavor. Don’t rush them.
Fingerling Potatoes
Fingerlings are small, elongated potatoes. They mature similarly to maincrop but are often harvested a bit earlier. Their thin skins mean they don’t store as long. Use the same foliage die-back rule.
Fingerlings are great for roasting and salads. Harvest them when the skins are set but before they get too large. Check a few tubers to gauge size.
Frequently Asked Questions
Can I Dig Potatoes After The First Frost?
Yes, but do it quickly. Frost can damage exposed tubers. If the foliage is killed by frost, dig within a week. The potatoes themselves are usually fine underground for a short time.
What Happens If I Dig Potatoes Too Early?
You get small, thin-skinned potatoes that won’t store. They are edible but have a shorter shelf life. The yield will also be lower because the tubers hadn’t finished growing.
Should I Water Potatoes Before Digging?
No. Watering before digging makes the soil muddy and increases the chance of bruising. Stop watering about a week before you plan to dig. Dry soil is easier to work with.
How Do I Know If Potatoes Are Ready Without Digging?
Look at the foliage. When it turns yellow and dies back, the potatoes are maturing. You can also gently scrape away soil to check skin set. But the foliage is the most reliable sign.
Can I Eat Potatoes Right After Digging?
Yes, but they taste better after curing. Freshly dug potatoes have a high moisture content and less starch. Curing improves flavor and texture. For immediate eating, new potatoes are best.
Now you know exactly when to dig up potato plants. Watch the foliage, wait two weeks after it dies, and use the skin set test. Your harvest will be bigger, tastier, and last longer. Happy digging.