How to Sow and Grow Potatoes: A Complete Guide
Potatoes are productive, adaptable and well suited to beds, large containers and no-dig gardens. The crop begins with certified seed potatoes rather than true seed. Success depends on healthy planting stock, fertile moisture-retentive soil and protecting developing tubers from light.
Choosing potato types
First earlies produce small new potatoes quickly, second earlies follow, and maincrops need the longest season but give the heaviest harvest and best storage. Choose varieties with useful resistance to blight, scab or eelworm where those problems are known locally. Buy certified seed potatoes rather than planting supermarket tubers, which may carry disease or have been treated to suppress sprouting.
Chitting and planting time
Chitting is optional but can give early crops a useful start. Stand seed potatoes with the rose end uppermost in a cool, bright, frost-free place for four to six weeks, keeping two or three sturdy shoots. Plant when soil is workable and beginning to warm. In cool temperate climates this normally runs from early spring for first earlies to mid-spring for maincrops; protect any shoots caught by late frost.
How to plant
Plant seed potatoes about 10–15 cm deep. Space first earlies roughly 30 cm apart in rows 60 cm apart; give maincrops 35–40 cm within rows 70–75 cm apart. In no-dig beds, make individual holes through the compost layer. In containers, use one seed potato for roughly every 10 litres of compost and avoid overcrowding.
Soil and feeding
Choose an open position and fertile, freely drained soil enriched with mature compost. Fresh manure can encourage scab and uneven growth, so add organic matter well in advance. A balanced organic potato fertiliser can be used on poor soil according to the label. Avoid excessive nitrogen, which produces leaf at the expense of tubers.
Earthing up, watering and care
Draw soil or compost around stems as they grow until a ridge protects the underground tubers. This prevents greening and gives some frost protection. Water deeply during dry spells, especially from flowering while tubers are swelling. Mulch helps stabilise moisture, but keep the bed free from perennial weeds and volunteer potatoes.
Growing potatoes in containers
Use containers at least 35–45 cm deep with drainage holes. Start with 15 cm of peat-free compost, plant the seed potatoes, then add compost around the shoots in stages. Do not fill the container completely at planting. Pots dry quickly, so check them often once foliage is full sized.
Common problems
Potato blight: remove infected foliage promptly, do not leave diseased tubers in the ground and choose resistant varieties; dispose of infected material according to local guidance
Scab: keep moisture steady as tubers begin forming and avoid fresh manure or unnecessary liming
Colorado potato beetle: inspect leaves and hand-pick adults, larvae and egg clusters where this pest occurs
Slugs and wireworms: harvest promptly, rotate crops and avoid leaving tubers in weedy ground
Green potatoes: exclude light by earthing up and discard green or bitter tubers because they contain elevated glycoalkaloids
Harvesting and storing
Harvest first earlies when plants flower and tubers have reached a useful size, gently feeling beneath one plant first. Maincrops are ready after foliage yellows and dies back. Lift on a dry day and allow skins to dry briefly out of direct sun. Store only sound maincrop tubers in paper sacks or ventilated boxes in a cool, dark, frost-free place; use damaged potatoes first.
A reliable approach
Use certified seed, match the variety to the harvest you want, keep developing tubers covered and maintain steady moisture during bulking. Rotation and careful clearing of volunteers reduce disease pressure in later years.
