Call us today: 0844 573 1818 Calls cost 7p per minute plus your phone company's access charge

100% Satisfaction Guarantee

Track Your Order

Award Winning Varieties

Voted Best Online Retailer

Our Customers Rate Our Excellent Service

How to grow potatoes in the ground

freshly harvested potatoes
Have a bountiful crop this year with our handy how-to guide
Image: Supod Kongkerd

What could be more satisfying than the fresh flavour of newly dug potatoes lifted straight from your own vegetable plot? If you're lucky enough to have the space for spuds, here's our easy to follow guide to help you grow potatoes in trenches in the ground.

Preparing the ground

weeding vegetable ground
Make sure to prep and clear your vegetable garden before planting
Image: Simon Kadula

To allow the soil to settle before planting, begin by preparing your potato plot well in advance. Do it in November or December, for planting at the end of February at the earliest. Remove all the weeds and dig the site thoroughly and deeply, lifting out large stones and incorporating plenty of well-rotted organic matter and high-potash fertiliser.

It's best to choose an open position in full sun on fertile, well drained soil. To reduce the chances of disease, avoid growing potatoes in the same plot for more than two years running. A slightly acidic soil is best but not essential as potatoes will tolerate a wide range of soils.

When growing potatoes in more alkaline soils, you may wish to apply sulphur to the top of the potato ridge after planting. This helps to maximize the yield and deters skin blemishes like common scab which is particularly troublesome in alkaline conditions.

Chit your potatoes

chitting potatoes in egg box
'Chitting' potatoes keeps your crop healthy and produce more harvest
Image: J Davidson

Seed potatoes, particularly earlies and second earlies, benefit from 'chitting' before planting to encourage strong shoots, fast growth, and heavier cropping. Seed potatoes are normally about the size of a chicken's egg, but often vary in size. Don't worry if yours are different sizes – they'll all grow equally well.

From late January into February, 'chit' your seed potatoes by setting them out in seed trays, shallow boxes or empty egg cartons in a cool, bright, frost-free position (10C/ 50F), to allow them to sprout. You'll notice that the immature 'chits' form at one end of the potato – called the 'rose end'.

Place the rose end upwards and let the 'chits' grow to 25mm (1") in length. Rub off all but the three or four strongest chits before planting, or you'll end up with lots of potatoes, but they'll be very small.


Cutting seed potatoes

cutting a potato in half
Make your harvest go further by cutting potatoes in half
Image: Home Grown Veg

During the 2nd World War it was common practice to cut larger seed potatoes in half or even smaller divisions to make them go further. The cuts should be left to dry out for 3 or 4 days before planting in the usual way. Provided that each piece has an eye or two for the new growth to develop, these tuber divisions will still crop well.


How to plant potatoes

Planting times vary considerably depending on soil conditions, and regional weather variations, but the table below should give you a general idea.

Dig a trench to a depth of about 10 cm (4") and place the seed potatoes into the soil with the rose end pointing up. Fill the trench with soil to cover the potatoes and, if required, scatter potato fertiliser along the top of the trench.

Crop typePlanting timePlanting distance in rowDistance between rowsApproximate harvest time
First early potatoesFrom end of February30cm (12") apart60cm (24") apart10 weeks from planting
Second early potatoesFrom mid March37cm (15") apart75cm (30") apart13 weeks from planting
Early maincrop potatoesFrom late March45cm (18") apart75cm (30") apart15 weeks from planting
Maincrop potatoesFrom late March45cm (18") apart75cm (30") apart20 weeks from planting
Second cropping potatoesEarly August30cm (12") apart60cm (24") apart11 weeks from planting

Aftercare

young potato plant in soil
Keep your young plants healthy with some TLC
Image: Shutterstock

To protect young potato plants from frosts which blacken the shoots, it's important to 'earth them up as soon as they emerge above ground. Simply draw some soil over the top of the shoots to cover them again. When the stems reach a height of 23cm (9"), earth them up again to stop tubers near the soil surface turning green.

Unless there's plenty of rain, first early and second early crops will need watering, especially when tubers are developing.

When to harvest your potatoes

person harvesting potatoes from ground
Know your harvest times for your crop
Image: Andrii Yalanskyi

Harvest times vary depending on the growing season, weather conditions at harvest time, and the size of tuber you want. Check out the table above for a rough guide for each crop type.

Because tubers tend to grow larger over the growing period, start harvesting first earlies as 'new potatoes' when the plants begin to flower, about 10 weeks after planting.

Maincrop varieties are best left in the ground for at least two weeks after the leaves and haulms (stems) wither, to allow the skins to set. Cut down the stems with secateurs to just above soil level as the leaves wither and yellow, or if they show signs of blight.


Second cropping potatoes

potatoes in breathable sack
Second-cropping potatoes need breathable storage to stop them from rotting
Image: photographyfirm

In the UK, second cropping potatoes are best planted outdoors in early August and no later than the end of August. If planting in a protected environment like a polytunnel or greenhouse, you can delay planting by a week or so but, to avoid disappointing results, you must have done it by the end of the first week of September.

There is no need to pre-chit these seed potatoes as this happens quite naturally after planting. 'Ping-pong ball' sized tubers should be ready for harvesting approximately 10 to 11 weeks after planting. Cut back the stems to just above ground level and dig up your spuds as you need them.

Protect late crops from frost by covering them with a thick layer of straw and/or sacking, and although they'll be more susceptible to attack by slugs and wireworm, you should be able to continue harvesting until around Christmas time.

After harvesting, leave the tubers on the soil surface for a few hours to dry and cure the skin. Once dry, store them in paper or hessian sacks in a dark, cool but frost free place. Avoid storing in polythene bags as potatoes will 'sweat' and rot.


Now you know how to plant and grow your own potatoes, all you need to do is decide which varieties to go for. With the right preparation and care, a mouthwatering pile of hot buttered spuds is yours for the taking.