Few crops give back as much as the humble spud, and once you learn how to grow potatoes you will wonder why you ever paid for a bag at the store. A single seed potato the size of an egg can return ten or more tubers, and digging them up feels a little like a treasure hunt every time. They are forgiving, they thrive in cool weather when half the garden is still waking up, and they store for months in a cool corner of the basement.
Most of the trouble people run into comes down to a handful of details: planting at the wrong moment, skimping on hilling, or starting with the wrong potatoes entirely. Get those right and the rest of the season is mostly patience. I will walk you through the whole arc, from choosing seed potatoes through curing the harvest for winter, plus the math nobody else seems to put in writing so you know exactly how much to plant.
Start With Certified Seed Potatoes, Not the Bag From the Pantry
Potatoes do not grow from the tiny seeds you might expect. They grow from “seed potatoes,” which are simply small whole tubers or cut chunks of larger ones, each carrying a few “eyes” (the little dimpled buds where sprouts emerge). Every eye is a potential plant.
Buy certified seed potatoes from a garden center, farm store, or seed company. The certification means they have been inspected and grown to be disease-free, which matters more than it sounds. Grocery store potatoes are a gamble: many are sprayed with sprout inhibitors so they sit pretty on the shelf, and they can quietly carry blight, scab, or viruses straight into your soil. You might get away with planting them once, but it is the kind of shortcut that costs you a whole bed later.
If you want something more interesting than the standard white potato, this is where the fun starts. There are over a hundred varieties, and they sort roughly into three groups by how long they take to mature, which also tells you when to harvest:
- Early-season (“new”) potatoes: 60 to 80 days. Tender, thin-skinned, ready by early summer. Best eaten fresh; they only store a few weeks. Examples: ‘Irish Cobbler’, ‘Red Norland’, ‘Yukon Gold’.
- Mid-season potatoes: 80 to 100 days. A good all-rounder for fresh eating and short-term storage. Examples: ‘Red Pontiac’, ‘Viking’, ‘Chieftain’.
- Late-season (maincrop) potatoes: 100 to 135 days. The heavy yielders with thick skins built for long winter storage. Examples: ‘Kennebec’, ‘Katahdin’, ‘Elba’.
A practical move is to plant a couple of types: an early variety for that first thrilling dig of baby potatoes, and a late one to fill the storage box for winter. If scab has been a problem in your garden, reach for a resistant variety like ‘Chieftain’ or ‘Elba’ and save yourself a headache.
Chitting Gives Early Potatoes a Head Start
Chitting, also called pre-sprouting, means letting your seed potatoes grow short, stubby green shoots before they go in the ground. It is optional, but it can shave a couple of weeks off the wait for your first harvest, which is exactly why early and second-early varieties benefit most. Maincrop potatoes sit in the ground so long that chitting them is hardly worth the bother.
Set the seed potatoes in an egg carton or shallow tray, the end with the most eyes (the “rose” end) facing up. Put them somewhere cool and bright, around 45 to 55 degrees Fahrenheit, out of direct hot sun. In three to four weeks you will have firm, dark green sprouts about half an inch to an inch long. Those are what you want, not the pale, leggy white threads potatoes throw out in a dark drawer. Long, spindly sprouts snap off easily during planting and signal the tuber is burning energy in the dark.
Cut and Cure Larger Seed Potatoes Before Planting
If your seed potatoes are small, roughly golf-ball size, just plant them whole. Larger ones can be cut into pieces, which stretches your supply and usually raises overall yield since each piece becomes its own plant.
Using a clean, sharp knife, cut each large potato into chunks about the size of a golf ball, making sure every piece has at least one or two healthy eyes. Then comes the step people skip and regret: let the cut pieces cure for one to three days in a cool, humid spot out of direct sun. The raw cut surfaces will dry and callus over, forming a protective skin that resists rot once the pieces hit moist soil.
One caveat from growers who battle soil pests: if your garden has wireworms, slugs, or maggots, consider planting whole instead. Those pests are drawn to the exposed flesh of a cut potato, and an uncut tuber gives them less to chew on.
When to Plant Potatoes Depends on Soil, Not the Calendar
Plant potatoes about two to four weeks before your average last spring frost, once the soil has warmed to at least 45 degrees Fahrenheit and is no longer cold and waterlogged. That usually means late March through early May across the northern states, February in mild southern regions, and even late fall or early winter in frost-free zones.
The temptation is always to plant early, but cold, soggy soil rots seed potatoes before they ever sprout. Waiting for the soil to warm a little means the plants emerge fast and grow without a stressful check. If a hard frost does nip the young foliage after it emerges, do not panic; the plants usually push up new shoots, though each die-back trims a little off the eventual yield. A floating row cover on frosty nights is cheap insurance.
If you would rather read the land than the calendar, every region has its own cue. Some gardeners plant when the first dandelions bloom, others when the snow finally clears off the nearest hill. Ask a neighbor who has gardened the area for years; local knowledge beats any chart.
Give Potatoes Sun, Loose Soil, and the Right pH
Potatoes want full sun, at least six to eight hours a day. In too much shade you get leafy plants and a disappointing dig.
The soil should be loose, deep, and rich in organic matter, the kind of loam that holds moisture yet drains freely. Work in compost the previous fall if you can, so the nutrients have time to settle. Avoid fresh manure: it can wake up the scab pathogen and leave your tubers blemished (still edible, just ugly). Well-composted manure or a low-nitrogen, higher-phosphorus fertilizer is the safer choice, because too much nitrogen gives you lush vines and few potatoes.
Soil pH is where you will find conflicting advice online, so here is the reconciliation. Potatoes grow perfectly well in a slightly acidic range of about 5.8 to 6.5. But if scab has plagued your garden, pushing the pH lower, down toward 4.8 to 5.5, actively suppresses the scab organism, which cannot tolerate acidity. So the “right” pH depends on your history: aim for around 6.0 for general growing, but lean acidic if scab is your nemesis, and never lime a potato bed.
How to Plant Potatoes Step by Step
Once the soil is ready, planting is quick:
- Dig a trench about 6 inches deep (a hoe or shovel does it; a rake works in already-loose soil).
- Set seed pieces in the trench cut-side down, eyes facing up, spacing them 10 to 12 inches apart. Whole large tubers want a bit more room, 12 to 16 inches; small fingerlings can go as close as 8 inches.
- Leave about 36 inches between rows. Wider rows feel wasteful but make hilling far easier later.
- Cover with 3 to 4 inches of soil, leaving the trench partly open. You will fill the rest in as the plants grow.
- Water it in. Sprouts typically break the surface in two to three weeks.
Hill Your Potatoes for a Bigger, Greener-Free Harvest
Hilling is the single task that separates a thin crop from a generous one, and it is the part beginners most often skip or do once and forget. Here is the logic: potatoes do not form on the roots. They form along the buried portion of the stem, on little underground runners called stolons. The more stem you bury, the more room the plant has to set tubers. Cover more stem, grow more potatoes.
Hilling does two other jobs at once. It keeps developing tubers in the dark, and that is not cosmetic. Tubers exposed to light turn green and produce solanine, a bitter, mildly toxic compound you do not want on the dinner table. Hilling also smothers weeds at the base of the plants and can shield tender shoots from a late frost.
When to hill: Start when the plants are about 6 to 8 inches tall, when there is enough stem to work with. Hill again every two to three weeks, or whenever they have grown another 6 inches, until they begin to flower. Flowering signals that tuber formation is in full swing and extra hilling no longer helps much. Most gardeners do two or three rounds total.
How to hill: With a hoe, draw loose soil up from both sides of the row and mound it around the stems, burying the lower portion and leaving only the top 3 to 4 inches of foliage showing. Keep the mounds loose, not packed; soil jammed tight against the stems traps moisture and invites rot. The first mound only needs a few inches. By the final round you will have built a hill roughly 10 to 18 inches high. Work in the morning when the plants stand upright and are easier to mound around, and rebuild any hills that wash flat after heavy rain. A telltale sign you are overdue: if the soil cracks and heaves near the base, tubers are already crowding the surface and need covering before they green up.
What to hill with: Garden soil from the pathways is the obvious material, but straw, shredded leaves, and compost all work, as long as they stay loose enough to breathe and drain. Straw is especially handy in hot weather because it holds moisture and keeps the soil beneath a touch cooler, which potatoes appreciate. Avoid anything that mats down into a dense, soggy layer.
If hilling sounds like too much labor, you have two lower-effort alternatives. Plant deep, 8 to 9 inches down, so the tubers form well below the light; sprouts take longer to emerge and yields run a little lower, but you skip most of the mounding. Or smother the bed in a thick, foot-deep blanket of straw (the old Ruth Stout method) and let the potatoes form within the mulch, which lifts off easily at harvest. Both trade a bit of yield for a lot less back-bending.
Water Steadily and Feed Lightly
Potatoes need about 1 to 2 inches of water a week, and the key word is consistent. Moisture matters most from the time the plants flower through tuber formation; let the soil swing from bone-dry to soaked and you get cracked, knobby, or hollow-centered potatoes. Water at soil level rather than over the leaves to keep foliage dry and discourage blight.
There is one window where watering is non-negotiable. In the three to six weeks after tuber initiation (roughly around flowering), dry soil opens the door to common scab. Watering deeply once or twice a week through that stretch is the simplest scab prevention there is.
On feeding: if you prepped the bed with compost and a low-nitrogen, high-phosphorus fertilizer at planting, the plants mostly take care of themselves. Side-dress with compost midseason only if the foliage looks pale or weak. Resist the urge to pour on nitrogen; you will grow a jungle of leaves and few tubers.
Growing Potatoes in Containers and Grow Bags
No in-ground space? Potatoes do beautifully in containers, which also sidestep many soil-borne diseases. Use a fabric grow bag or pot at least 16 inches deep and 10 to 15 gallons in volume; a 10-gallon bag comfortably grows two or three seed pieces.
Start with about 4 to 6 inches of loose, fertile potting mix in the bottom, set the seed potato on top, and cover loosely. As the stem climbs, keep adding mix to bury the lower portion, exactly like hilling in the ground, until the mix reaches the rim. Then let the plant run.
The one thing to stay on top of is water. Containers dry out far faster than garden beds, sometimes needing daily watering in summer heat, and a potato that dries out repeatedly sets fewer, smaller tubers. Set the bag where it gets full sun, and at harvest you simply tip it over: no digging, no spearing tubers with a fork.
How Much to Plant and What to Expect
This is the math most guides leave out, and it is the difference between a hobby row and an actual winter supply. As a working rule, 1 pound of seed potatoes yields roughly 5 to 10 pounds of harvest under good conditions, and a single plant typically returns 5 to 10 tubers, or about 1 to 3 pounds.
So if your household eats around 100 pounds of potatoes over a winter, plan on planting somewhere between 10 and 20 pounds of seed, give or take with your soil and variety. A 1-pound bag of seed potatoes, cut into golf-ball pieces, plants roughly a 10-foot row. Maincrop varieties out-yield earlies, so weight your planting toward late-season types if storage is the goal, and toward earlies if you mainly want fresh new potatoes off the vine.
When and How to Harvest Potatoes
There are two harvests hiding in every potato patch. About two to three weeks after the plants flower, you can steal a few “new” potatoes: reach into the loose soil at the side of a plant and pull out a handful of thin-skinned tubers without disturbing the rest. These are a treat, but they will not store; eat them within a few days.
For the main, storable harvest, wait until the vines yellow and die back on their own, the plant’s signal that the tubers have matured and skins have toughened. Many growers mow or cut the tops a couple of weeks before digging to firm up the skins further for storage. Then, on a dry day, work a garden fork in from the outer edge of the plant (not straight down through the center, where you will spear your dinner), loosen the soil, and lift. Sift through the dug soil for stragglers; there are always a few hiding.
You can leave maincrop potatoes in the ground through a couple of light frosts, but get them up before a hard freeze, which damages the tubers nearest the surface.
Cure and Store Potatoes for Months of Eating
Curing is what turns a fresh-dug potato into one that keeps until spring, and it is easy. Do not wash them; brushing off the loose dirt is enough, and washing only invites rot. Spread the potatoes in a single layer somewhere cool, dark, and humid with good airflow, around 45 to 60 degrees, for one to two weeks. The skins thicken and any small nicks heal over.
Once cured, move them to long-term storage: a dark, well-ventilated spot at roughly 40 to 50 degrees, such as a basement, cellar, or unheated closet. Keep them in paper bags, mesh bins, or cardboard boxes, never sealed plastic, which traps moisture and rots the crop. Keep them away from apples and onions, whose gases hasten sprouting, and check the box every few weeks, pulling any that turn soft, shriveled, or sprouted before one bad potato spoils its neighbors.
A word on green potatoes, since it is a safety issue: light exposure, in storage or on a poorly hilled plant, turns the skin green and builds up solanine. Store in the dark to prevent it, and if you find a green spot, cut it well away before cooking, or toss the potato if more than a little has gone green.
Stay Ahead of the Common Pests and Diseases
A few persistent troublemakers can dent a potato crop, but a little prevention handles nearly all of them. The two habits that do the most work are simple: rotate your crops, never planting potatoes (or their nightshade cousins tomatoes, peppers, and eggplants) in the same spot more than once every three years, and always start with certified disease-free seed.
On the pest side, the headliner is the Colorado potato beetle, an oval yellow beetle with black stripes whose pink, black-headed larvae can strip a plant of leaves in a couple of days; hand-pick them and crush the orange egg clusters on leaf undersides, and reach for a targeted insecticide only if they overwhelm you. Aphids cluster on leaf undersides and spread virus; encourage ladybugs and lacewings rather than spraying, since those allies are themselves easily killed by insecticide. Leafhoppers cause leaf tips to yellow and curl (“hopperburn”), worst from mid to late spring. Wireworms, slender wire-like click-beetle larvae, chew seed pieces and tubers, especially in beds that were lawn the year before; bury chunks of raw potato as bait traps, check them weekly, and remove what you catch.
On the disease side, late blight is the one that keeps growers up at night: irregular dark, water-soaked spots on leaves, white mold underneath, and brown rot in the tubers, all of it racing through warm, humid weather. Plant resistant varieties, keep foliage dry, give plants airflow, and remove infected plants fast. Early blight shows as concentric “target” rings on the lower, older leaves; tidy garden debris and steady watering keep it minor. Common scab leaves corky brown patches on the skin and is driven by dry soil at tuber formation and by alkaline ground, so water through that window and keep the pH on the acidic side. Blackleg and soft rot blacken the stem base and turn tubers into foul-smelling mush; there is no spray that fixes it, so the cure is prevention: clean seed, no overwatering, and pulling any infected plant the moment you spot it.
Growing potatoes rewards patience more than skill. Pick the right seed for the harvest you want, plant when the soil is ready, hill faithfully, and keep the water steady, and the plants will hand you a harvest that pays for itself many times over. Order your seed potatoes now, mark your last frost date, and get ready for the best part of the whole season: tipping over a plant and watching the spuds tumble out of the dirt.