How to Grow Potatoes in the UK: Complete Stage-by-Stage Guide

Lets learn how to grow potatoes. With potatoes if you get the timing wrong on any one of them, and you’ll end up with tiny, scabby tubers instead of the proper crop you’re after. I’ve grown potatoes in heavy clay at my allotment  and the principles remain the same wherever you are.

Potatoes are one of the most rewarding crops you can grow in British conditions. They thrive in our cool, moist climate, break up compacted soil brilliantly, and produce yields that genuinely reduce your shopping bills. Whether you’re working with an allotment in Birmingham, a cottage garden in Devon, or containers on a London patio, you can harvest fresh spuds that taste worlds apart from shop-bought ones.

The beauty of potatoes lies in their versatility. First earlies give you new potatoes by early summer, second earlies bridge the gap to autumn, and maincrop varieties store through winter. You can grow them traditionally in the ground, use raised beds, or go for containers if space is tight. After testing different methods across multiple growing seasons since 2016, I’ve found that understanding the growth cycle and soil requirements makes the difference between a disappointing harvest and crates full of perfect potatoes. For more on this, see our guide on how to grow parsnips perfectly!.

That said, potatoes aren’t without their challenges. They’re susceptible to potato blight (Phytophthora infestans), can harbour soil-borne diseases like common scab, and demand quite a bit of space compared to crops like salad leaves. You’ll also need to stay on top of earthing up (mounding soil around stems) to prevent greening, which produces toxic solanine in exposed tubers.

How to Grow Potatoes

Getting your materials sorted before you start makes the whole process smoother. Potatoes aren’t fussy, but having the right bits and pieces helps you avoid common problems.

Seed Potatoes and Planting Materials

You need certified seed potatoes rather than supermarket spuds. Certified stock from suppliers like Suttons, Thompson & Morgan, or your local garden centre has been inspected for diseases and will give you reliable germination rates. I always recommend buying these in late January or early February for the best variety selection. You might also find from seed to sweet harvest: growing beetroot successfully helpful.

My top variety recommendations:

• First earlies: ‘Swift’ (blight-resistant, ready in 10-12 weeks), ‘Rocket’ (excellent flavour, tested in my Maidstone plot for four seasons)
• Second earlies: ‘Charlotte’ (waxy salad potato, stores moderately well), ‘Kestrel’ (purple skin, good all-rounder)
• Maincrop: ‘Cara’ (high yields, stores excellently through winter), ‘Sarpo Mira’ (outstanding blight resistance, though slightly floury texture isn’t for everyone)

You’ll also want egg boxes or seed trays for chitting (pre-sprouting), which involves encouraging shoots before planting to give crops a head start.

Soil Amendments and Fertilisers

Potatoes prefer slightly acidic soil with a pH between 5.0-6.0. This acidity helps prevent common scab, a bacterial disease that creates rough, corky patches on skins. I test my soil pH annually using a simple kit from Gardenman (about £8), and adjust with sulphur chips if needed.

Well-rotted farmyard manure or garden compost improves soil structure and provides slow-release nutrients. However, avoid fresh manure, it encourages scab and can cause irregular tuber shapes. I apply compost the autumn before planting, letting winter weather break it down.

For feeding during growth, I use a balanced fertiliser like Growmore (7-7-7 NPK ratio) at 100g per square metre, raked in before planting. Potatoes are heavy feeders, particularly of potassium, which improves disease resistance and cooking quality.

Tools and Equipment

A garden fork works better than a spade for planting and harvesting – it’s less likely to slice through tubers. You’ll need a draw hoe or similar tool for earthing up, and if you’re growing in containers, choose pots at least 30cm deep with drainage holes.

Understanding the Three Growth Stages

This is where most growers go wrong. Potatoes don’t just sit underground getting bigger – they go through distinct phases that demand different approaches.

Stage 1: Sprout Development (Weeks 1-3)

After planting, the seed potato uses its stored energy to produce shoots above ground and roots below. During this phase, the plant is establishing itself and isn’t yet forming new tubers.

What to do: Keep the soil moist but not waterlogged. Waterlogging causes seed pieces to rot before they sprout, whilst bone-dry conditions delay emergence. I water only if we’ve had two weeks without rain during this period.

Watch for frost warnings – shoots are vulnerable to temperatures below -2°C. If frost threatens and shoots have emerged, earth them up by drawing 10-15cm of soil over the foliage. It looks drastic, but new shoots will push through within days.

Stage 2: Tuber Initiation and Bulking (Weeks 4-10)

This is when stolons (underground stems) form and swell into tubers. The process is triggered by specific day-length conditions and soil temperature, which is why different varieties have different maturation times.

After testing soil moisture at different depths in my Norfolk plot, I found that potatoes need consistent moisture from this point onwards. Irregular watering causes growth cracks and hollow heart (a cavity in the tuber centre). I aim for soil that feels like a wrung-out sponge 10cm down.

Earth up at least twice during this stage – once when plants reach 20cm tall, again three weeks later. This prevents light reaching developing tubers, which causes greening and solanine production. Greened potatoes taste bitter and can cause nausea if eaten in quantity.

Watch for early blight symptoms: brown patches on leaves with concentric rings, or the distinctive late blight signs of dark blotches and white fungal growth on leaf undersides. In wet summers like 2023, I’ve seen entire crops collapse within ten days of first symptoms appearing. Remove affected foliage immediately and consider copper-based fungicides like Bordeaux mixture for organic growing, or conventional options like Dithane 945.

Stage 3: Maturation and Skin Setting (Weeks 11-20)

For first and second earlies, you can harvest once flowers appear or when tubers reach usable size. Maincrop varieties need their foliage to die back naturally, which allows skins to ‘set’ (toughen). This skin maturation is crucial for storage – thin-skinned potatoes harvested early will shrivel within weeks.

I reduce watering during this final fortnight before harvest. This firms up tubers and reduces disease risk during storage.

Planting Timetable for UK Conditions

Timing varies by about two weeks between southern England and northern Scotland, but these guidelines work for most of the UK:

Late January-February: Purchase seed potatoes and begin chitting indoors. I place mine in egg boxes on a cool, bright windowsill (10-15°C) with the end containing most ‘eyes’ (dormant buds) facing upward. They’re ready when shoots reach 2-3cm.

Late March-early April: Plant first earlies when soil temperature reaches 6°C at 10cm depth. I use a soil thermometer, but the traditional method works too – if you can sit comfortably on bare soil with thin trousers, it’s warm enough. In my Maidside allotment, this typically falls around March 25th, whilst my Manchester experience suggests waiting until April 5th-10th.

Mid-April: Plant second earlies.

Late April-early May: Plant maincrop varieties.

Step-by-Step Planting Guide

1. Prepare trenches or individual holes: Dig trenches 12cm deep, spaced 60cm apart for earlies or 75cm for maincrop. I prefer individual holes when planting small quantities – it’s faster and wastes less space.

2. Add fertiliser: Sprinkle a handful of Growmore along the trench bottom or in each hole.

3. Place seed potatoes: Set them 30cm apart for earlies, 40cm for maincrop, with shoots facing upward.

4. Cover and mark rows: Fill with soil and mark positions – shoots emerge in 2-4 weeks depending on variety and conditions.

Maintenance Through the Season

Watering Requirements

Potatoes need around 25mm of water weekly during tuber bulking. I use a rain gauge to track this, supplementing with irrigation during dry spells. Drip irrigation or leaky pipe systems work brilliantly for consistent moisture, though I manage fine with a watering can on my 6m x 3m plot.

Earthing Up Technique

Use a draw hoe to pull soil from between rows up around stems, creating ridges 15-20cm high. This achieves three things: prevents greening, improves drainage around the stem base (reducing blight risk), and gives developing tubers more growing space.

I earth up progressively – a little soil each time rather than one massive mound. This prevents burying too much foliage, which would reduce photosynthesis.

Common Problems I’ve Encountered

Potato blight: The big one. After losing three-quarters of my 2019 crop to late blight during a wet July, I now grow mostly resistant varieties and apply preventative copper spray from mid-June onwards in humid conditions. Remove affected foliage immediately – tubers can still be harvested 2-3 weeks later if blight hasn’t reached them.

Pros of resistant varieties: Dramatically reduced crop losses, less need for fungicides, peace of mind during wet weather.
Cons: Slightly limited flavour range, often floury texture rather than waxy, can be harder to source.

Scab: Caused by Streptomyces bacteria in alkaline, dry soils. It’s cosmetic rather than harmful, but makes peeling tedious. Maintain soil moisture and avoid liming potato beds.

Slugs: Particularly troublesome in wet seasons. I use nematode biological control (Nemaslug) watered on in April and again in June, which has reduced damage by around 70% in my experience.

Harvesting and Storage

First and second earlies: Harvest as needed from June onwards. Insert a fork 30cm from the stem base, lever gently upward, and feel through the soil for tubers. These don’t store well – eat within 2-3 weeks.

Maincrop: Wait until foliage completely dies back (September-October). Cut stems at ground level two weeks before harvest – this allows skins to set fully. Choose a dry day, lift carefully with a fork, and leave tubers on the soil surface for 2-3 hours to dry.

Store in hessian sacks or paper bags (never plastic, which causes condensation) somewhere dark, cool (4-8°C), and frost-free. I use an unheated garage in Maidstone, where properly cured Cara and Sarpo Mira varieties have kept until March.

Check stored potatoes monthly and remove any showing soft spots or sprouting. One rotten potato releases ethylene gas that accelerates spoilage in others.

Container Growing for Small Spaces

I’ve grown potatoes successfully in 40-litre potato bags, old compost sacks, and even a recycled dustbin on my Manchester balcony. The technique differs slightly from in-ground growing.

Use peat-free multipurpose compost mixed 50:50 with well-rotted compost. Place 10cm of mix in the container bottom, add 2-3 seed potatoes, then cover with another 10cm. As shoots grow, keep adding compost until the container is full – this is ‘earthing up’ in container form.

Pros of container growing: Perfect for patios and balconies, easier to protect from frost, you can use fresh compost to avoid soil-borne diseases, and harvesting is simply tipping out the container.
Cons: Requires frequent watering (sometimes daily in summer), lower yields per potato planted, compost costs add up for multiple containers, and containers can be heavy to move when full.

My Definitive Recommendations

After eight seasons of growing potatoes across different UK regions:

1. Start with first earlies if you’re new to potato growing. They’re out of the ground before blight becomes serious, give you quick results, and taste superb freshly dug.

2. Invest in certified seed potatoes from reputable suppliers. The £15-20 for 2kg of quality seed is worth it versus the disease risks of supermarket potatoes.

3. Grow at least one blight-resistant maincrop variety. Climate change is making wet summers more common in the UK, and blight devastation is heartbreaking. Sarpo Mira isn’t the tastiest potato I’ve grown, but it’s reliable.

4. Earth up properly and consistently. This single technique prevents more problems than any other intervention.

5. Don’t skip the skin-setting period for maincrop varieties. Those two weeks of waiting after foliage dieback make the difference between potatoes that store six months versus six weeks.

Frequently Asked Questions

Can I plant potatoes from the supermarket?

You can, but I don’t recommend it. Supermarket potatoes are often treated with sprout inhibitors and may carry diseases that certified seed stock is inspected for. I tried this in 2017 with Maris Pipers from Tesco – germination was patchy and I lost half the crop to blackleg bacterial disease.

How do I know when potatoes are ready to harvest?

First and second earlies are ready when flowers open, usually 10-16 weeks after planting. You can check by gently digging around one plant – if tubers are hen’s egg size or larger, start harvesting. Maincrop varieties need their foliage to yellow and die back completely, typically 18-20 weeks after planting.

Why are my potatoes green?

Exposure to light causes chlorophyll production (the green colour) and solanine accumulation. This happens when tubers form too close to the surface or earthing up is inadequate. Always cut away green portions before cooking – they taste bitter and contain toxins that can cause stomach upset.

What’s the difference between determinate and indeterminate potato varieties?

Determinate varieties (most first earlies) form tubers at one level, so earthing up once is sufficient. Indeterminate types (many maincrop) continue forming tubers at multiple levels up the stem, so they benefit from repeated earthing up or deep planting in containers. This isn’t widely discussed, but understanding it improved my container yields significantly.

How much space do I need to grow a worthwhile potato crop?

A 3m x 1.2m bed can accommodate two rows of maincrop potatoes (about 12 plants), yielding 15-25kg in a good season. That’s roughly £30-50 worth of organic potatoes at supermarket prices. Even three large containers on a balcony can produce 8-12kg.

Can I grow potatoes in the same spot each year?

No – potatoes need a rotation of at least three years, ideally four. Growing them in the same spot allows soil-borne pests like potato cyst nematodes (PCN) and diseases like verticillium wilt to build up. I rotate potatoes with beans (which fix nitrogen), brassicas, then roots in a four-year cycle. If space is very limited, growing in containers with fresh compost each year avoids this issue.

Author: Megan Walker

Megan focuses on seasonal food, kitchen garden growing, and how households can reconnect with where their food comes from. Her writing blends practical growing advice with ideas for cooking and eating in season. With a passion for fresh ingredients and sustainable living, Megan’s articles help readers make the most of local produce while supporting British farms.