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Gardening Tips

How To Grow Seed Potatoes

Potatoes

Potatoes are hugely versatile and a staple ingredient of many meals in one form or another - boiled, mashed, chipped or baked. Potatoes are classified as being either earlies or maincrops. Early varieties are ready to harvest much sooner than maincrops and are what we call ‘new potatoes’. Maincrop varieties are in the ground a lot longer. They have a better yield and produce larger potatoes.

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Sow

Potatoes are grown from special ‘seed’ potatoes (also called tubers). These are just like potatoes you buy from the supermarket, but they’re certified virus-free. Buy seed potatoes from late winter onwards. You start them off indoors by setting them to sprout, before they are planted.

Preparing before planting

It’s important with earlies and a good idea with maincrops to ‘chit’ the seed potatoes first before planting; this means allowing them to start sprouting shoots. Stand them rose end up (the rose end is the one with the most small dents in the skin, or ‘eyes’) in egg boxes or similar in a light, frost-free place. The potatoes are ready to plant when the shoots are about 3cm (1in) long. On early potatoes, rub off the weakest shoots, leaving four per tuber.

Plant

Follow these guidelines for planting times of seed tubers:

First earlies: around late March

Second earlies: early to mid-April

Maincrops: mid- to late April

This varies slightly depending on where you are in the country. If you are planting in containers, start even earlier. Potatoes need a sunny site away from frost pockets - the newly emerging foliage is susceptible to frost damage in April and May. Prepare the ground the previous autumn or winter by digging in organic matter such as well-rotted animal manure. The traditional planting method is to dig a narrow trench 12cm (5in) deep. The seed tubers are spaced 30cm (12in) apart for earlies and 37cm (15in) for maincrop varieties in rows 24in (60cm) apart for earlies and 75cm (30in) apart for maincrop. Apply a general purpose fertiliser at this stage.

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Grow

When growth emerges, start the process of ‘earthing up’. Wait until the stems are about 23cm (9in) high and draw soil up to the stems creating a ridge about 15cm (6in) high. As the stems grow, repeat the process. The final height of the ridges will be about 20-30cm (8in -1ft). Earthing up protects newly emerging foliage from frost damage. It also protects the developing potatoes from light that turns potato tubers green. Green potatoes are poisonous. Keep crops well watered in dry weather; the vital time is once the tubers start to form. Maincrop potatoes benefit from a nitrogenous fertiliser around the time of the second earthing up. Other planting methods Another method is to grow the potatoes under black polythene. The tubers are planted through slits in the polythene. The advantage of this method is that there is no need to earth up and the new potatoes form just below soil level which means there’s no digging to harvest them, they’ll lie just below the sheet. Small crops of potatoes can also be grown in large, deep containers, and this is a good way of getting an early batch of new potatoes. Fill the bottom 15cm (6in) of the container with potting compost and plant the seed potato just below this. As the new stems start growing, keep adding compost until the container is full.

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Harvesting

First early potatoes should be ready to lift in June and July, second earlies in July and August, maincrops from late August through to October. With earlies, wait until the flowers open or the buds drop; the tubers are ready to harvest when they are the size of hens’ eggs. With maincrops for storage wait until the foliage turns yellow, then cut it and remove it. Leave for 10 days before harvesting the tubers, leaving them to dry for a few hours before storing.

All information freely available on https://www.rhs.org.uk/advice/grow-your-own/vegetables/potatoes

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