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Container Growing

How To Grow Potatoes In A Bag

Growing potatoes in bags

Using growbags couldn’t be easier, here is how to grow potatoes in a bag. The great thing about potatoes is that they can be grown almost anywhere, even if space is
limited like in an urban setting. Reusable potato growbags are available and are ideal for
growing your own potatoes on a patio, balcony, greenhouse, polytunnel, or by the back
door.

View Our Seed Potato Collection Here

What You Need:

  • Your choice of seed potatoes, (if it is your first time growing potatoes, choose an early
    variety of seed potato, like Homeguard, Duke of York or Orla as they will be ready to harvest sooner than maincrop varieties and thus avoid the worst of the blight season.).
  • One or more potato planters or growbags, also called potato tubs.
  • A good multi-purpose compost, (or 60/40 mix of compost/topsoil).
  • A potato fertilizer is optional but is recommended for a maximum yield.

Place potato grow bags in full sunWhere to place potato grow bags
First off, choose a light, warm sunny spot to place your grow bag or planter in, if possible choose an area with at least 6 hrs of direct sun per day.

Most potatoes should be planted between mid March to late April, however they can be planted as early as February in a greenhouse, polytunnel or conservatory and either grown in situ or moved outside after all danger of frost has passed.

Chitting potatoes in egg boxChitting Potatoes
Chit the potatoes to produce sturdy shoots, encouraging quicker establishment and better growth. Chitting means leaving the potatoes in an open egg box or similar for approx 4 weeks to allow them to sprout.

Place the potatoes with with the most ‘eyes’ facing upwards and leave them in a light, cool and frost free place. The eyes of a potato are the tiny buds in the skin where the new shoots come from.

Planting Potatoes
Fill the planter to approximately 20cm with your multi-purpose compost or top soil/compost mix. Evenly spread 3 or 4 seed potatoes on top of the compost and cover with another 10cm of compost.

Seed potatoes grown in bagsAs the plants grow gently cover the shoots with more compost until the level is just below the top of the bag or planter. Remember to keep the compost moist but
not saturated, occasional heavy watering is better than regular light watering as the water needs to get down to the lower roots.

A potato feed with a high potash content will help increase the potato yield substantially, our orgainc potato fertilizer is perfect and gives you all the information you need on the pack. Don’t use feeds high in nitrogen as these will give excess leafy growth at the expense of the potato crop.

Potato blight can rear it’s ugly head from July on. Many traditional methods of controlling blight like Bordeaux mixture are no longer available on the market so either growing early varieties is recommended as above but there are also a range of blight resistant seed potatoes available like Sarpo Mira, Setanta or Orla.

Harvesting potatoes grown in bagHarvesting Potatoes
Early varieties of potato should be harvested as they are needed because they don’t store very well. Maincrop varieties can remain in the bags until needed, store the bags indoors to avoid freezing on cold

Otherwise potatoes can be stored in hessian bags or in sand in a cool, frost free environment. They should be checked occasionally for signs of rot, and the affected tubers removed so as not to infect the other potatoes.

First Earlies are best harvested in small quantities and eaten straightaway when fresh in June and July.

Second Earlies and Salad varieties can also be harvested in small quantities and eaten when fresh in June and July. Alternatively, if the skins are allowed to ‘set’ – i.e. they don’t rub off when lifted – cut the foliage down to stop continued growth, lift in September and store as per Maincrop varieties.

Maincrop varieties can be lifted from September onwards and stored as long as the tubers are lifted in dry conditions or are properly stored. Store in a hessian sack in a cool, dark, frost-free area.

The 7 Secrets to Growing Success with Potato Growing Bags

Follow these 7 points to grow the best Grow Bag produced potatoes.
Chitting Potatoes – Chit tubers (to produce sturdy shoots) in a cool light place before planting to encourage quicker establishment and growth.
When to plant potatoes in growing bags– Start your grow sacks in greenhouse or conservatory from as early as February and move outside when all risk of frost is past.
Where to grow potatoes – All potatoes do best grown in a light, warm sunny spot.
Soil and Compost – use a good proprietary compost or an equal mix of compost and soil and place a layer 4-6 inches in the bottom. Place potatoes on compost and cover with a further 4-6 inches of compost.
Earthing Up Potatoes – Potatoes grow from the stem beneath the surface. So keep covering the foliage with more compost as it grows until the sacks are full to within 4 inches of the top.
Feeding and Irrigation – This really is the big the secret. Mix potato fertiliser or a good general purpose fertiliser such as Growmore with the compost during planting and earthing up. Keep compost consistently moist (but not over wet) and you will reap dividends for your crop.
Potato Pest Control – Finally, Potato Blight can be a major problem from July with later yielding crops. Help fight this fungal disease with ‘Vitax Bourdeau Mixture’, a traditional, protective fungicide, available in ‘pest control’ section.

18 comments
  1. Jon

    For the benefit of those in the UK under the age of 60, 8 inches = 20 cm, because imperial makes no sense whatsoever.

    From Jon in the UK

    1. Andrew

      Hi Deborah. I’ll have a look at that and will add metric. You’d be surprised how many people in the UK give out to me if I don’t use imperial….

  2. Mary Jo Stoop

    Ha ha! I love the UK. Here in the US it remains inches, feet and miles. I’m retired from the medical field and well schooled in metrics. Makes no never mind to me which is which. I save my rant for our idiot POTUS. Thanks for the useful information.

    1. Andrew

      Hi Tim
      I think you are probably right there, sometimes I forget this is a public forum. I have removed the political references, you make a very valid point. Andrew

  3. James Dowker

    Im 29 and use inches if im measuring anything bigger than 10cm, Inches are still used in the UK, thats the benefit of having a brain we can use both metric and imperial like most countries, i get the top comment for translating it into inches but the second comment i saw as just rude.
    If you thought it does not mean say it you may offend someone.
    Sorry rant over, happy growing all!

  4. Tim Hutchinson

    Hi Andrew,
    Not an issue at all, its just there is so much rancour at the mo its a pleasure to get away from it on this forum.
    I am a bit late getting my potatoes in ( middle of May ) and they are sprouting and I’m just earthing up. This is a first time for me ….not to late am I ?

  5. Joan

    Hi, complete beginner, I’m armed with a potato bag, premium compost (site declaration) and sprouting potatoes !! My philosophy, bung em in and fingers crossed! Any tips?

    1. Andrew

      Hi Joan
      That’s about it. I would put 3 per bag and mix in a little organic slow release fertilzer as compost won’t have enough feed for full lifecycle, chicken manure pellets is a good option used sparingly.

    1. Andrew

      Hi Katherine. No, if you can get your hands on some seed potatoes. We will have some mid June which will be ideal for growing in bags.

  6. Gillian

    I am reading the comments and cracking up. I live in Trinidad, which is in the Caribbean, we use both metric and imperial so we confuse everyone! Lol. My potatoes are happy and sprouting, will cover with soil tomorrow and hope it gives me lots of fun potatoes.

    1. Andrew

      Hi Gilian. Good to hear your potatoes are going well and that you’re getting a laugh out of the comments. I thought I was writing an article about growing potatoes in a bag but you never know where these things end up!

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