How to grow potatoes (in beds, bags or containers)

Few vegetables reward beginners as quickly as potatoes. You can grow a meaningful harvest in a bag on a patio, in a raised bed, or in a traditional garden row — and eating your own freshly dug new potatoes is one of those experiences that makes the effort feel completely worthwhile.

Why grow potatoes?

Potatoes are a genuinely high-calorie, nutrient-dense staple — a good source of vitamin C, potassium and B vitamins — and home-grown varieties include flavours and textures you simply cannot buy. Waxy salad types hold together beautifully in cooking; floury maincrops make clouds of mash; some heritage varieties have coloured flesh and nutty, earthy flavour that is a world away from the supermarket standard.

From a food-growing perspective, potatoes make excellent use of space. In containers and grow bags they work for balconies and tiny gardens — see our guide to growing food in small spaces for more ideas. They're also useful as a "cleaning crop" because the act of earthing up and then digging breaks up compacted soil and suppresses weeds. In a new raised bed, a first-year potato crop can help condition the soil for future plantings.

Seed potatoes and chitting

Always buy certified seed potatoes from a garden centre or reputable online supplier rather than using potatoes from the supermarket. Certified stock is inspected and guaranteed free from the main potato viruses and blight strains that can persist in your soil for years. Supermarket potatoes are often treated with a sprout suppressant, and even when they do sprout, you have no way of knowing what disease they carry.

Chitting is the process of encouraging your seed potatoes to develop short, sturdy sprouts before planting. It gives the plant a head start — particularly valuable for early varieties where the growing season is short.

• Stand the seed potatoes rose-end up (the end with the most eyes) in an egg box, seed tray or cardboard box.
• Place them in a cool, bright, frost-free location — a spare bedroom windowsill is ideal. An unheated greenhouse works too, provided temperatures don't drop below freezing.
• Leave them for 4–6 weeks. You want sprouts that are short and stubby — around 1–2 cm — rather than long, pale and weak. Short sprouts come from cool, bright conditions; long pale ones mean it was too warm or too dark.
• If a tuber develops many sprouts, you can rub off the weaker ones, leaving 2–4 strong ones on first earlies, or 1–3 on maincrop for larger individual tubers.

First earlies, second earlies and maincrops explained

Potato varieties are grouped by how long they take to mature rather than by any fixed calendar date — because "when to plant" varies by location, climate and your last frost date.

• First early varieties (e.g. 'Rocket', 'Foremost', 'Red Duke of York') are ready in roughly 10–12 weeks from planting. They produce smaller, waxy new potatoes and are harvested young, straight into the pot. They're ideal for containers and grow bags, and are planted as soon as the soil is frost-free in spring (or in mild climates, as early as late winter under fleece).
• Second early varieties (e.g. 'Charlotte', 'Maris Peer', 'Kestrel') take about 13–15 weeks. They bridge the gap between new potatoes and maincrops, still waxy and excellent for salads, and a bit more generous in yield.
• Maincrop varieties (e.g. 'Desiree', 'King Edward', 'Rooster') need 15–20 weeks and produce the bulk of a potato harvest — larger tubers, good for baking, mashing and roasting, and suitable for long-term storage. They also carry a higher blight risk simply because they're in the ground during the warmer, wetter months when blight pressure is highest.

In the Northern Hemisphere, first earlies are typically planted between early March and mid-April (depending on your last frost); in the Southern Hemisphere, early spring planting maps to September–October. In warm, frost-free climates, potatoes can be grown through winter and into early spring to avoid the hottest months.

Planting in beds, raised beds and containers

Potatoes need a loose, well-drained, reasonably fertile soil and at least half a day of direct sun. They dislike waterlogging and very alkaline soils (a pH of 5.5–6.5 is ideal, which also helps suppress scab).

In the ground: Dig a trench 10–15 cm deep and plant seed potatoes 30–35 cm apart for first earlies, or 37–45 cm apart for maincrop, with rows 60–75 cm apart. Place tubers sprout-side up and cover. Adding a layer of well-rotted compost or manure along the trench base feeds the crop through the season.

In raised beds: Raised beds warm up faster in spring and often have excellent drainage — a real advantage. Follow the same spacing, though you can plant at the closer end. Raised bed gardening suits potatoes particularly well if your native soil is heavy clay or very stony.

In containers and grow bags: This is a great option for small spaces — see our full guide to growing food in small spaces. Use a container or grow bag that holds at least 30–40 litres and is at least 30–40 cm deep. Ensure it has drainage holes. Stick to first early or second early varieties, which are faster and less demanding.

Planting in a container — step by step

1. Choose your container. A purpose-made potato grow bag, a large planter, or even a sturdy bin with drainage holes drilled in the base — aim for 35–50 litres. Fabric grow bags are good because they breathe and prevent waterlogging.
2. Add the first layer of compost. Fill the bottom 10–15 cm with good multipurpose compost. You can mix in some garden soil or a small amount of well-rotted manure or pelleted fertiliser for extra nutrients.
3. Place chitted seed potatoes. Put 2–3 chitted seed potatoes on top of the compost with sprouts facing up. Space them evenly — they don't need to be far apart in a container.
4. Cover with 10 cm of compost. Firm lightly and water well.
5. Earth up when shoots appear. Once green shoots are 10–15 cm tall, add another 10–15 cm of compost to cover most of the stem, leaving just the top few leaves showing. Repeat as the plant grows until the container is full.
6. Water regularly. Containers dry out fast. Check daily in warm weather and water thoroughly when the top few centimetres of compost feel dry. Irregular watering causes hollow heart and hollow tubers.
7. Feed from flowering onwards. Apply a liquid tomato feed (high in potassium) weekly once the plants are at full height — this supports tuber development rather than leafy growth.
8. Harvest. When plants begin to flower (first earlies) or when the foliage yellows (maincrops in containers), tip the container out onto a tarpaulin or into a wheelbarrow. Pick through the compost carefully and collect all tubers, including small ones.

Earthing up, watering and feeding

Earthing up is the practice of mounding soil or compost up around the base of the growing stems. It serves two purposes: it keeps developing tubers in darkness so they don't turn green (see the callout below), and it encourages the buried stem to produce additional tubers. Do it when shoots are 10–20 cm tall, covering roughly two-thirds of the stem. Repeat every 2–3 weeks as the plant grows.

Watering needs are moderate until the plants flower, then more consistent moisture is important during tuber swelling. Dry spells followed by heavy watering can cause tubers to crack or develop hollow centres. In dry climates or during summer heat, a drip irrigation system or soaker hose under the ridge saves a lot of hand-watering. See our water-wise gardening guide for irrigation strategies.

Feeding: If you planted into well-composted soil, potatoes may need little additional feeding. In poorer soils or containers, a balanced general fertiliser worked into the soil at planting and a switch to a potassium-rich feed (tomato feed) once flowering begins will support a good yield.

Pests and diseases to watch for

Good growing practices — crop rotation (don't grow potatoes in the same spot more than once every three years), certified seed potatoes, and keeping the crop earthed up — go a long way towards preventing problems. For a comprehensive overview of garden pest management, see our natural pest control guide.

• Potato blight (Phytophthora infestans): The most serious threat to maincrop potatoes in warm, wet summers. It appears first as brown patches at leaf margins, often with a pale yellow halo, then spreads rapidly to collapse the whole plant and rot the tubers. There is no cure once it takes hold. Preventive measures include choosing blight-resistant varieties (e.g. 'Sarpo Mira', 'Orla'), growing first earlies (which are usually harvested before blight season), and removing infected foliage promptly. In very high-risk areas, copper-based sprays applied preventively before blight weather (warm and humid, above 10°C for two days) can slow spread. Cut back infected haulm and leave tubers in the ground for a further 2–3 weeks — healthy tubers can still be harvested if the tuber skin wasn't penetrated.
• Common scab (Streptomyces scabies): Produces rough, corky patches on the skin. It's primarily cosmetic — the potato still tastes fine once peeled — and is worst in alkaline, dry soils. Avoid liming the bed before potatoes, water regularly during tuber initiation, and choose resistant varieties like 'Cara' or 'Maris Piper' for affected plots.
• Slugs: Slug damage creates tunnels through tubers, making them unstorable and often letting rot in. Slug pressure is highest in wet summers and in heavy soils. Reducing slug habitat (long grass, old debris), encouraging natural predators (frogs, hedgehogs, ground beetles), and using ferric phosphate slug pellets or nematode treatments targeted at soil slugs are all effective strategies. Harvesting earlies before populations peak also helps.
• Wireworm: The larvae of click beetles bore thin tunnels into tubers. Most problematic in newly broken ground or grass-to-bed conversions. Turns less of a problem after a few seasons of cultivation.

Harvesting, curing and storing your crop

Harvesting first and second earlies: Dig a test plant when the flowers open — if the tubers are marble-sized or larger, you can start harvesting. Earlies don't store well, so harvest little and often as you need them. Use a fork to gently lever up the root ball and pick over the loosened soil for any tubers that rolled away.

Harvesting maincrop: Leave maincrop potatoes until the foliage has died back and yellowed naturally — this signals the tubers have finished swelling and that the skins are set (hardened). Choose a dry day to harvest. Lift carefully with a flat fork, working at the edge of the ridge to avoid spearing tubers. Leave freshly lifted potatoes on the soil surface for an hour or two to dry off if conditions allow, but bring them in before any risk of frost.

Curing: Before storing maincrop potatoes, cure them for 1–2 weeks in a warm (around 15°C), humid, dark location. This toughens the skin, heals any minor cuts and nicks from the fork, and dramatically extends shelf life.

Storing: Pack cured potatoes in paper sacks, hessian bags or wooden boxes — never sealed plastic, which causes sweating and rot. Store in a cool (4–8°C), dark, frost-free place such as a garage, shed or cellar. Check them every few weeks and remove any that are softening or rotting. Well-cured maincrop potatoes in good storage can last 4–6 months. Light causes greening, and warmth encourages sprouting, so darkness and cool temperature are both essential.

• Buy certified seed potatoes — not supermarket ones.
• Chit in a cool, bright spot for 4–6 weeks before planting.
• Plant at the right time for your climate and last frost date.
• Earth up every 2–3 weeks until the haulm is full grown.
• Water consistently during tuber swell; feed with potash once flowering.
• Rotate potato beds — don't plant in the same spot for 3 years.
• Cure maincrops before storage; store dark, cool and dry.
• Always cut out or discard any green potato flesh — never eat it.