Potato

Choosing & planning

What is potato and where does it grow best?

Potato (Solanum tuberosum) is one of the most important vegetable crops in the world, grown for the underground swollen stems called tubers; it originated in the Andes of South America. It is a cool-season crop that grows best in full sun, well-drained soil, and cooler climates, and does well at high elevations. Potatoes can be grown as a cool-season annual across USDA zones 2–11 and year-round in frost-free areas.

What are the main types of potato, and how do they differ?

There are more than 100 potato types, broadly grouped into russets (starchy, brown-skinned, ideal for baking and mashing), red potatoes (waxy to starchy, good for boiling and salads), white potatoes (white or yellow flesh), purple/blue potatoes, and fingerlings. Floury, high-starch varieties break down when cooked and suit mashing and frying; waxy, low-starch varieties hold their shape and suit soups, curries, and salads. Varieties are also classified by days to maturity: early (60–80 days), mid-season (80–100 days), and late (100–130 days).

Which potato varieties are recommended, and how do I choose one?

Choose based on starch level (high-starch russets for baking and mashing; waxy types for boiling and salads), days to maturity relative to your season length, and disease resistance. Popular varieties include ‘Yukon Gold’ (early, all-purpose), ‘Russet Burbank’ (late, high-starch, good for baking), ‘Red Norland’ (early, waxy, great boiled), ‘Kennebec’ (mid-season, blight-resistant), and ‘Red Pontiac’ (mid-season, highly adaptable). Early varieties suit short seasons and are less prone to blight since they are typically harvested before the disease takes hold.

What should I look for when buying potato seeds or transplants?

Always buy certified disease-free seed potatoes from a reputable garden center, nursery, or seed distributor. Certified seed potatoes have not been treated with sprouting inhibitors and are guaranteed free of pathogens. Avoid grocery store potatoes, which are often treated with growth inhibitors that prevent good sprouting and may carry plant diseases.

Can I grow potato in my climate or hardiness zone?

Potatoes can be grown as a cool-season annual in USDA zones 2–11 and year-round in frost-free areas. They thrive in cooler climates with daytime temperatures of 65–80°F (18–27°C) and around 55–65°F at night; tuber development slows or stops when soil temperature exceeds 80°F.

Can I grow potato in containers or pots, and what size do they need?

Yes, potatoes grow well in containers. Use a pot at least 14 inches deep with a capacity of 10–15 gallons; each plant needs approximately 2.5–5 gallons of growing space, so a 20-inch diameter container can fit about 4 plants. Containers 2–3 feet deep are ideal for maximum yield. Fabric grow bags, wheeled trash cans, and large plastic bins all work well, provided they have good drainage and are made of food-safe, opaque material.

Starting from seed & propagation

Should I start potato from seed or buy transplants?

Potatoes are grown from tubers called seed potatoes, not from true seed. Purchase certified seed potatoes from a reputable grower or garden center each year—they produce stronger, more vigorous plants and are guaranteed disease-free. Home-saved tubers may carry undetectable diseases, and grocery store potatoes sprout poorly due to growth-inhibitor treatments.

How deep should I sow potato seeds?

Potatoes are grown from seed pieces (tubers), not true seeds. Plant seed potato pieces in a furrow or hole 3–6 inches deep—4 inches is the most common recommendation—cut side down with eyes facing up. Cover with 2–3 inches of soil initially, then add more through hilling as the plant grows.

What temperature do potato seeds need to germinate?

Seed potato pieces sprout best when soil temperature is at least 45–55°F (7–13°C). Potatoes form tubers most effectively at 60–70°F; planting in cold, wet soil delays sprouting and can cause seed pieces to rot before they emerge.

Why are my potato seedlings leggy or weak?

Insufficient sunlight is the main cause—potatoes need full sun (at least 6 hours of direct light daily), and plants grown in areas with poor sun exposure will be lanky and spindly. In hotter climates, intense afternoon sun can cause leaf scald instead.

Site, soil & timing

How much sun does potato need?

Potatoes need full sun—at least 6 hours of direct, unfiltered sunlight daily. They can tolerate some shade but grow and produce best with maximum sun exposure. Potatoes grown in poor sun will be lanky and spindly.

What type of soil does potato prefer?

Potatoes grow best in loose, well-drained, sandy, fertile soil. Poorly drained or heavy clay soil promotes diseased and rotting tubers. Well-drained soil allows tubers to develop freely and reduces disease risk.

What soil pH does potato need?

The ideal soil pH for potatoes is 5.8–6.5 (slightly acidic), though they will tolerate pH as low as 5.0. Maintaining pH below 6.5—ideally between 5.2 and 6.0—also helps reduce the incidence of potato scab, which is most prevalent in soils with pH above 5.2–7.0.

How should I prepare and amend the soil for potato?

Work a 2-inch layer of compost into the soil before planting to improve fertility and drainage. Avoid large amounts of fresh manure or uncomposted organic matter, as this increases the occurrence of potato scab. If no soil test has been done, apply 1–2 pounds of an all-purpose 10-10-10 fertilizer per 100 square feet, broadcast and incorporated shortly before planting.

When should I plant potato outdoors?

Plant potatoes 2–4 weeks before the last expected spring frost, when soil temperature reaches at least 45°F. Depending on region, this can be as early as February–March in warm climates or as late as April–May in cooler northern regions. In warm climates, fall or winter planting is also common.

Does potato tolerate frost, heat, or drought?

Potato shoots are sensitive to freezing temperatures; frost damage ranges from blackened leaf margins (minor) to death of all aboveground growth (severe), but the plant normally sends up new shoots within 10–14 days without needing replanting. Potatoes are a cool-season crop and tuber development stops when soil temperature exceeds 80°F. Inconsistent moisture—alternating drought and heavy rain—causes growth cracks, hollow heart, and knobby tubers.

Planting

How far apart should I space potato plants?

Plant seed potato pieces 10–12 inches apart within the row as a general rule. Larger varieties like russets can benefit from up to 15 inches of spacing, while smaller varieties like fingerlings can be planted as close as 8 inches apart.

How far apart should the rows be?

Space rows 2–3 feet (24–36 inches) apart. Three feet between rows is the most common recommendation, providing room for hilling and easy access throughout the season.

How deep should I plant potato?

Plant seed potato pieces in a furrow or hole 4–6 inches deep, cut side down with eyes facing up. Cover with 2–3 inches of soil initially, then add more soil or straw through repeated hilling as the plant grows to keep developing tubers covered and prevent greening.

Are there special planting techniques for potato?

Hilling is the key technique: when plants reach about 6 inches tall, mound several inches of soil or clean straw around the stem, and repeat throughout the season to cover developing tubers, prevent greening, and maximize yield. Chitting (pre-sprouting seed potatoes in a cool, bright location before planting) gives plants a head start. Cut large seed potatoes into pieces with 2–3 eyes each and allow cut surfaces to callus for 2–5 days before planting to reduce rot.

What grows well next to potato (companion plants)?

Field peas, basil, chives, and garlic are excellent companion plants for potatoes. Basil repels beetles, flies, and mosquitoes; chives deter Japanese beetles; garlic fends off codling moths, beetles, and other crawling and flying pests. Field peas increase garden diversity and attract beneficial insects and pollinators.

What should I avoid planting near potato?

Avoid planting potatoes where tomatoes, eggplants, peppers, or other nightshade (Solanaceae) family members have grown in the past 3 years. Shared pests—especially Colorado potato beetle, which overwinters in soil—and shared diseases like late blight build up when related crops are grown in the same location repeatedly.

Watering

How much and how often should I water potato?

Potatoes require 1–2 inches of water per week during the growing season, with especially consistent moisture during tuber development. Water deeply once a week in dry weather rather than with shallow, frequent irrigation.

What is the best way to water potato?

Water deeply once a week, allowing moisture to penetrate the full root zone. Deep, nighttime soaking is preferable to daytime surface watering. Avoid overhead irrigation that keeps foliage wet, as prolonged leaf wetness promotes late blight and other fungal diseases.

What are the signs of over- or under-watering potato?

Alternating wet and dry periods cause hollow heart, growth cracks, and knobby tubers. Saturated soil causes white, raised spots on tubers as lenticels swell due to impeded gas exchange. Prolonged drought followed by heavy rain or irrigation causes tubers to split or crack as they rapidly absorb water.

Should I mulch potato, and with what?

Yes. The primary mulching technique is hilling—mounding several inches of soil or clean straw around the plant stem as it grows to retain moisture, keep tubers covered, and prevent greening. Pine needle mulch has also been recommended to help reduce potato scab.

Feeding & fertilizing

How should I fertilize potato?

If no soil test has been done, broadcast 1–2 pounds of 10-10-10 fertilizer per 100 square feet before planting. Side-dress with nitrogen—approximately 0.15 pounds actual N per 50 feet of row—about four weeks after planting during the first hilling, then repeat two weeks later. Potatoes require more fertilizer than most other vegetables.

What fertilizer or nutrients does potato need?

Potatoes are heavy feeders requiring substantial nitrogen (N), phosphorus (P), and potassium (K)—a 300 cwt/acre crop removes approximately 128 lb/A of nitrogen and 144 lb/A of potassium. They also need calcium, magnesium, sulfur, and micronutrients including zinc, boron, iron, copper, and manganese. A soil test including pH, P, K, Ca, Mg, Zn, and B is recommended before planting.

When and how often should I feed potato?

Apply fertilizer before planting, then side-dress about four weeks after planting during the first hilling, and repeat two weeks later during the second hilling.

What are the signs of nutrient deficiency in potato?

Highly alkaline soils induce deficiencies particularly in iron and manganese. Overly acidic soils can limit overall nutrient availability, stunting plant growth. Iron deficiency is more related to high soil pH than to actual soil iron levels.

Support, training & pruning

How do I support potato as it grows?

Hilling is the primary support technique: mound soil or straw around the stems when plants reach about 6 inches tall, and repeat every few weeks as plants grow. This keeps the developing tubers covered, prevents greening, and supports the upright growth of the plant throughout the season.

Pollination & fruit set

Why are the flowers dropping off my potato?

Flower drop is a normal signal that small new potatoes are ready for early harvest—start checking about 7–8 weeks after planting once white or lavender flowers appear and begin falling off. It does not indicate a problem with the plant.

Pests

What pests commonly attack potato?

Above ground, common pests include Colorado potato beetle (yellowish-brown with five black stripes), flea beetles (tiny dark beetles), blister beetles, green peach and potato aphids, and potato leafhoppers. Below ground, wireworms, white grubs, vegetable weevils, European corn borer, symphylans, cabbage maggots, and onion maggots attack tubers and roots.

How do I identify potato pest damage?

Colorado potato beetle adults and larvae eat leaves and stems, leaving ragged foliage with stringy black excrement. Leafhoppers cause stippling and yellowing of leaf tips and margins (‘hopperburn’) and make leaves crinkle and curl upward. Aphids cause mottled or discolored foliage and excrete honeydew that promotes sooty mold. Flea beetles chew tiny, round holes in leaves. Wireworms and other soil pests bore holes into tubers underground.

How do I prevent potato pests?

Rotate potatoes to a new garden location every 3 years to break pest cycles, particularly for Colorado potato beetle which overwinters in soil and emerges in spring to feed on nightshade-family plants. Use row covers in early spring to exclude adult beetles. Keep plants well-fed with compost to improve resistance to pests and pathogens. Companion planting with basil, chives, and garlic can deter flying and crawling insects.

How do I control potato pests organically and chemically?

For Colorado potato beetle, handpick adults and larvae off plants or use a plant vacuum, then dispose of them in soapy water; use row covers in early spring to block access before adults emerge. For leafhoppers, spray daily with a strong stream of water to knock off adults; treat heavy infestations with insecticidal soap or organic horticultural oil such as neem. Allow beneficial predators to control light leafhopper populations naturally rather than treating unnecessarily.

Diseases

What diseases commonly affect potato?

Common potato diseases include late blight (caused by Phytophthora infestans), early blight (Alternaria solani), common scab (Streptomyces scabies), and blackleg (Pectobacterium atrosepticum). Late blight is the most destructive and thrives in cool, wet conditions with high humidity or prolonged leaf wetness.

How do I recognize potato disease symptoms?

Late blight: small water-soaked leaf spots that enlarge into brown or black lesions with a pale halo; fuzzy white mold on leaf undersides in humid weather; reddish-brown, dry, granular rot extending inward from tuber skin. Early blight: dark brown circular spots with concentric rings (target pattern) and yellow halos on older leaves; dark sunken lesions on tubers. Common scab: rough, corky, or pitted patches on tuber surfaces. Blackleg: stunted growth, yellowing upper leaves, and blackening of the lower stem near the soil line.

How do I prevent potato diseases?

Plant certified, disease-free seed potatoes every year. Rotate potatoes to a new garden area every 3–4 years. Choose resistant or tolerant varieties—‘Kennebec’ resists late blight; ‘Chieftain’ and ‘Elba’ resist scab; ‘Russet Burbank’ and ‘Superior’ tolerate scab. Ensure good air circulation through proper plant spacing and avoid overhead irrigation that wets foliage. Maintain soil pH below 6.5 to reduce scab incidence.

How do I treat or manage potato diseases?

For late blight and early blight, improve air circulation through proper plant spacing, avoid overhead watering that wets foliage, and remove and destroy infected plant material. Avoid excessive nitrogen fertilization, which promotes early blight spread. For scab, plant certified seed potatoes, practice crop rotation every 3–4 years, and choose resistant cultivars; lowering soil pH is difficult and usually impractical for most home gardeners.

Disorders & troubleshooting

What physiological disorders affect potato (such as blossom-end rot, cracking, or sunscald)?

Common physiological disorders include: green tubers (from light exposure during growth or storage); growth cracks (from rapid moisture uptake after drought); hollow heart (from alternating wet and dry periods during tuber development); knobby tubers (from soil moisture fluctuations); white raised spots on tubers (lenticel swelling from waterlogged soil); rough, corky scab patches; and frost damage causing blackening or death of shoots.

What causes these disorders and how do I prevent them?

Green tubers result from light exposure—hill soil around plants and store harvested potatoes in complete darkness. Growth cracks, hollow heart, and knobby tubers all result from inconsistent soil moisture—maintain even watering of about 1 inch per week throughout tuber development. White raised spots (lenticel swelling) result from saturated soil—ensure good drainage and avoid overwatering. Frost-damaged shoots regenerate within 10–14 days, so replanting is not needed.

Why are my potato leaves yellowing, curling, or spotted?

Potato leafhoppers cause leaves to crinkle, curl upward, and develop yellowing of tips and margins called ‘hopperburn.’ Aphids cause mottling and general discoloration of foliage. Early blight produces dark brown circular spots with concentric rings (target pattern) and yellow halos, starting on older leaves. Late blight causes water-soaked spots that enlarge into brown or black lesions with pale green or yellow halos.

Why is my potato not growing or producing well?

Insufficient sunlight causes spindly, unproductive plants—potatoes need full sun (6+ hours daily). Soil temperatures above 80°F stop tuber development entirely. Poor drainage causes tuber rot. Inconsistent watering during tuber development reduces yield and causes hollow heart and cracking.

Harvest

How long does potato take to mature?

Early-season varieties mature in 60–80 days; mid-season varieties in 80–100 days; late-season varieties in 100–130+ days from planting. New (baby) potatoes can be harvested as early as 7–8 weeks after planting, once plants begin to flower.

How do I know when potato is ready to harvest?

For new potatoes: harvest 7–8 weeks after planting when plants first flower or flowers begin falling off. For storage potatoes: wait until vines turn completely brown and die back, then perform a skin rub test—mature potatoes have firm skins that resist rubbing and don’t slip off easily. Other signals include reaching the variety’s stated days-to-maturity and a notable slowdown in tuber growth.

How do I harvest potato correctly?

Insert a digging fork or shovel 4–6 inches straight down into the soil beside (not through) the plant, then pull the handle toward you to uproot tubers without piercing them. Be thorough at season’s end to avoid leaving tubers in the ground. For new potatoes, reach into the soil with your hand, take 2–3 tubers from the edge of the root zone, and leave the plant in place to keep growing.

How often should I harvest potato?

New potatoes can be harvested a few tubers at a time from each plant starting 7–8 weeks after planting, with the plant left in place to continue producing until season’s end. Full-sized storage potatoes are harvested all at once after the tops have died back completely.

Storage, preservation & seed saving

How should I store fresh potato, and how long does it keep?

After harvest, cure potatoes for 1–2 weeks in a dark, well-ventilated area at 45–60°F with 85–95% humidity to toughen skins and heal cuts. Then store cured potatoes unwashed in a cool (ideally 32–40°F), dark place with good airflow—in mesh bags, burlap sacks, paper bags, or cardboard boxes—for up to 6 months. New potatoes do not store well and should be eaten within days. Avoid light exposure during storage, which causes greening and solanine production.

How do I save seeds from potato for next year?

Potatoes are propagated from tubers (seed pieces), not true seed. You can save home-grown tubers from the previous year’s crop, but they may carry undetectable diseases and tend to produce weaker plants. Certified seed potatoes from commercial growers are strongly recommended each season for stronger, more vigorous, disease-free results.

Uses & nutrition

What is potato commonly used for in cooking?

High-starch, mealy potatoes such as russets are best for baking, frying, mashing, and roasting—they absorb butter and cream while staying light and fluffy. Waxy potatoes hold their shape when cooked and are ideal for soups, curries, frittatas, and potato salads. Red-skinned potatoes are commonly boiled or used in salads. New potatoes are excellent roasted or in salads. Potatoes are also used to make gnocchi, Italian pasta-like dumplings made from potato, flour, egg, and salt.

Season extension & regional growing

How can I extend the potato growing season?

Chitting (pre-sprouting) seed potatoes before planting—by setting them in a cool, bright place until shoots develop—gives plants a head start and can bring harvest forward by several days to a couple of weeks. In warm regions, planting in fall or winter rather than spring effectively extends the productive season.

Can I grow a fall or second crop of potato?

Yes. In warm regions, seed potatoes are commonly planted in fall or winter as the primary growing season. In cooler areas, early-season varieties planted in spring can be followed by a second planting of early varieties in early summer for a fall harvest.

How do I grow potato in a particularly hot or cold region?

In hot climates, avoid dark-colored containers that absorb heat and raise soil temperatures above 80°F, which stops tuber development; consider fall or winter planting instead of spring. In cold climates, use chitting to get an early start and harvest before the ground freezes. Frost-damaged shoots regenerate within 10–14 days, so replanting after a late spring frost is rarely necessary.