Potatoes are one of the highest-calorie crops you can grow per square foot, and one of the most forgiving. A single pound of seed potato turns into 8 to 12 pounds of harvest in a decent season. But forgiving is not the same as foolproof. Scab, green shoulders, mushy tubers in February, and a row chewed to stems by Colorado potato beetles all trace back to a few decisions made months earlier. This guide walks the whole sequence, from choosing seed in late winter through pulling the last sound tuber out of storage in spring, with the specific numbers I use on my own beds.

Choosing Seed and Planning Your Quantity

Start with certified seed potatoes, not grocery store spuds. Supermarket potatoes are often treated with sprout inhibitors, and they can carry late blight, viruses, or ring rot that you do not want anywhere near your soil. Certified seed is inspected for disease and costs roughly $2 to $4 per pound from a farm supply or mail-order grower. It is the cheapest insurance in the whole process.

Varieties group by days to maturity, and the grouping matters more than the name on the bag:

  • Early (70 to 90 days) — Yukon Gold, Red Norland, Dark Red Norland. Best for new potatoes and summer sales. Thin skins, poor long-term storage.
  • Mid-season (90 to 110 days) — Kennebec, Red Pontiac, Adirondack Blue. Good all-purpose types that store three to four months.
  • Late (110 to 135 days) — Russet Burbank, German Butterball, Katahdin. Thick skins, highest yields, store six months or more when cured properly.

For quantity, the rule I plan around is 10 to 12 pounds of seed per 100 feet of row, which should return 100 to 150 pounds at harvest. A household eating potatoes twice a week through winter needs about 50 to 75 pounds in storage, so a 50-foot row of a late variety covers it. Market growers should plant at least two maturity groups so there is something to sell from July through the fall markets.

Chitting and Cutting Seed Pieces

Chitting, or green-sprouting, means waking seed potatoes up before they go in the ground. Set them in a single layer in egg cartons or shallow trays, eyes up, in a bright room at 60 to 70°F for two to four weeks. You want short, stubby green or purple sprouts a half inch long, not the long white ones that grow in a dark cellar. Chitted seed emerges 7 to 10 days faster and matures earlier, which matters for a short-season early crop.

Cut large seed potatoes into pieces one to two days before planting. Each piece should weigh 1.5 to 2 ounces, about the size of a golf ball or a bit bigger, and carry at least one good eye, ideally two. Pieces smaller than an ounce produce weak plants. Pieces larger than 3 ounces are a waste of seed money with no extra yield. Anything the size of a hen’s egg or smaller goes in whole.

Let cut pieces sit at room temperature for a day so the cut surface dries and callouses. Some growers dust with sulfur or agricultural gypsum to suppress rot. I skip it and just make sure the soil is not waterlogged at planting, which matters more.

Cut seed on a Saturday, plant on Monday. The two-day callous is the difference between a seed piece that sprouts and one that rots in cold wet April soil.

Soil, pH, and Planting Depth

Potatoes want loose, well-drained soil and a pH on the acidic side. The target is 5.0 to 6.0, and this is one of the few crops where you deliberately avoid liming. Common scab, the corky brown patches that make tubers ugly but still edible, thrives above pH 5.5 and is nearly absent below 5.2. If your beds test at 6.5 or higher, rotate potatoes to your most acidic ground and consider elemental sulfur the fall before.

Fresh manure is the other scab trigger. If you keep livestock and spread manure, give potato beds a full year after application, or use only finished compost. Growers who run animals alongside vegetables often track their manure applications and pasture rotations in a dedicated livestock app like Barnsbook, which makes it easy to confirm which fields got raw manure and when before you commit potatoes to them.

Planting timing comes down to soil temperature, not the calendar. Plant when soil at 4 inches reads 45°F or warmer, usually two to four weeks before your last frost date. Seed pieces will sit and rot in soil below 40°F. Spacing and depth:

  • Depth — 4 inches in a trench, cut side down, eyes up. Deeper than 6 inches delays emergence; shallower than 3 inches means more greening later.
  • In-row spacing — 10 to 12 inches for storage crops, 8 inches if you want smaller new potatoes.
  • Row spacing — 30 to 36 inches to leave room for hilling. In a 30-inch raised bed, two rows 15 inches apart works if you hill from the pathway side.

Potatoes are heavy feeders. A balanced organic fertilizer at planting, around 2 to 3 pounds of a 4-4-4 per 100 feet of row, banded 2 inches to the side of the seed, is enough. Go easy on nitrogen. Too much pushes lush tops at the expense of tubers and delays maturity. Potassium is the nutrient that most affects tuber size and storage quality, so if your soil test shows low K, address it with sulfate of potash in the fall.

Hilling and Watering Through the Season

Hilling is the single most important in-season task. Tubers form on the stolons above the seed piece, not below it, so every inch of soil you pile up is more room for the crop. It also buries any tubers that would otherwise push to the surface and turn green.

The first hill goes on when plants are 6 to 8 inches tall. Pull soil from between rows up around the stems, leaving the top 2 to 3 inches of foliage exposed. Repeat two to three weeks later, and once more if the plants are still growing vigorously. Three hillings total, building a mound 8 to 12 inches tall, is the standard. Stop when the plants flower, because by then the stolons have set and disturbing the roots costs you yield. If you mulch with straw instead of soil, use it 6 inches deep and add more as it settles. Straw-hilled potatoes are easier to harvest but run a bit cooler, which slows early varieties.

Water needs are modest until flowering, then jump. From flower through the three weeks after, potatoes need 1 to 2 inches per week delivered evenly. Irregular watering during this window causes knobby, cracked, or hollow tubers. Drip tape under the hill is ideal. Once the vines start to yellow and die back, stop watering entirely so the skins can set in dry soil.

I keep a log of each hilling date and the first flower date per row, because those two numbers tell me when to start checking for new potatoes and when to shut the water off. CropsBook handles this well: one planting record per row, notes stamped with the date, and the whole thing works in the field with no signal.

Ready to put this into practice? Download CropsBook on the App Store — it’s free and works offline.

Colorado Potato Beetle, Blight, and Scab

Three problems account for most potato failures, and all three are manageable if you act early.

Colorado potato beetle is the one you will see first. Adults are striped yellow and black, about three-eighths of an inch long. They overwinter in soil and walk to the nearest potato patch in spring, which is why rotating potatoes at least 300 feet from last year’s site cuts pressure substantially. Watch the undersides of leaves for clusters of 20 to 30 orange eggs and crush them. Larvae are soft, humpbacked, and brick red. They do the real damage, and a plant can lose 30 percent of its foliage before flowering with no yield loss, but defoliation after flowering hurts fast. On a small scale, hand-picking twice a week into a bucket of soapy water is genuinely effective. For larger plantings, spinosad or Bt tenebrionis sprayed on small larvae works well. Both are organic-approved and both lose effectiveness on large larvae, so timing is everything. Floating row cover from planting until the first hilling stops the walking adults entirely.

Late blight is the disease that caused the Irish famine and it still shows up in wet years. Look for dark, water-soaked lesions on leaves with a white fuzzy margin on the underside in humid mornings. It moves through a planting in days. Prevention is certified seed, wide spacing for airflow, and avoiding overhead irrigation. If it arrives, cut and remove infected vines immediately, then wait two weeks before harvesting so spores on the surface die before tubers come up through them. Early blight, the more common cousin with concentric target-shaped spots, is slower and mostly cosmetic. Copper sprays slow both if you catch them early.

Scab you handle before planting, with pH and manure timing as described above. Consistent moisture during the four to six weeks after tuber initiation, roughly when plants flower, also reduces scab severity. Resistant varieties like Russet Burbank and Superior help if you cannot get pH down.

Walk the potato rows every three days from emergence to flowering. A beetle egg mass crushed in May is a hundred larvae you never have to deal with in June.

Harvesting New Potatoes vs. Storage Potatoes

There are two harvests from the same planting. New potatoes are ready two to three weeks after the plants flower. Reach into the side of the hill with your hand and pull a few egg-sized tubers from each plant, leaving the rest to size up. Their skins rub off with a thumb and they will not store more than a week in the fridge, but they sell for a premium at market and taste like nothing else.

The storage harvest comes after the vines die back naturally, or two to three weeks after you mow or cut them. This waiting period is not optional. Tubers continue to thicken their skins after the tops die, and a potato dug with a skin that rubs off under your thumb will not keep. Test a few: if the skin holds when you press and rub firmly, dig the row.

Dig on a dry day with a broadfork or potato fork, working in from the side of the hill, 12 inches out from the stem, to avoid spearing tubers. Let them sit on the soil surface for an hour or two to dry, but not longer in direct sun. Sort as you go into three grades: sound tubers for storage, damaged or speared ones for eating this week, and any green or diseased ones for the compost. Weigh each row’s yield before it goes to the cellar. Tracking yield per variety per bed in CropsBook over a few seasons will tell you faster than any catalog which types actually earn their space on your ground.

Curing and Storage That Lasts Until Spring

Curing heals cuts and scrapes and thickens the skin further. Hold the harvest at 50 to 60°F with 85 to 95 percent humidity for 10 to 14 days, in the dark. A garage or basement in early fall with the tubers in open crates covered by a damp burlap sack gets close enough. Skipping this step is why so many home-stored potatoes rot by December.

After curing, drop the temperature. The ideal long-term storage is 38 to 40°F at 90 percent humidity in complete darkness. A root cellar, an unheated basement corner, or an insulated box in a garage that stays above freezing all work. Below 38°F, starches convert to sugars and the potatoes taste sweet and fry dark. Above 50°F, they sprout within two months. Store them in slatted crates, mesh bags, or paper sacks that allow airflow, never sealed plastic.

  1. Keep them dark — light turns skins green and produces solanine, which is bitter and mildly toxic. Peel away any green and the rest is fine, but prevention is easier.
  2. Separate from onions and apples — both give off ethylene that triggers sprouting. Onions also pull moisture from the air that potatoes need.
  3. Check monthly — pull any soft or sprouting tubers before they spread rot to neighbors. One bad potato really does spoil the crate.

Done right, late varieties keep six to eight months. I am typically still eating sound German Butterballs in April from an October harvest. Save the smallest clean tubers from your best-performing rows as next year’s seed if you are confident the planting was disease-free, though buying fresh certified seed every two to three years keeps viruses from building up.

Potatoes are cheap to grow and expensive to store badly. Two weeks of curing and a 40-degree cellar are worth more than any variety choice you make.

Fitting Potatoes Into the Whole Farm

Potatoes are a nightshade, so rotate them with tomatoes, peppers, and eggplant as one family and keep that family off any given bed for three to four years. They follow a legume or a brassica well, and they leave the soil loose and clean for a fall-planted garlic or a spring salad bed the next year. Because they do not depend on pollinators to set tubers, they are a reliable crop even in a cold wet spring when bee activity is low, which is a comfort to anyone who also keeps hives and watches the weather through that lens. Beekeepers who track forage conditions in HiveBook will notice that potato bloom offers the bees almost nothing, so plan your pollinator strips elsewhere and let the potato block be a working block.

The whole sequence, from certified seed in March to the last crate in April, is about a dozen decisions made on time. Chit for three weeks. Cut to 2-ounce pieces and callous for two days. Plant 4 inches deep in 45-degree soil at pH 5.5. Hill three times. Water hard from flowering on, then stop when the vines yellow. Crush beetle eggs every three days. Wait two weeks after vine death to dig. Cure at 55 degrees for two weeks, then store at 40. Write each of those dates down, and next year you will be adjusting from your own records instead of guessing from someone else’s.