Growing Potato

Solanum tuberosum : Solanaceae / the nightshade family

Jan F M A M J J A S O N Dec
      P P              

(Best months for growing Potato in USA - Zone 5a regions)

  • P = Plant seed potatoes
  • Plant tuber. Best planted at soil temperatures between 50°F and 86°F. (Show °C/cm)
  • Space plants: 12 - 16 inches apart
  • Harvest in 15-20 weeks. Dig carefully, avoid damaging the potatoes.
  • Compatible with (can grow beside): Peas, Beans, Brassicas, Sweetcorn, Broad Beans, Nasturtiums, Marigolds
  • Avoid growing close to: Cucumber, Pumpkin, Sunflowers, Tomatoes, Rosemary
  • An 'earthed-up' row
  • Potato flowers
  • Potato harvest

Seed potatoes

Potatoes sold in nurseries and produce stores are certified seed potatoes. Seed potatoes are small potatoes (usually fairly dried up and wrinkled) which are free of viruses and other diseases. You are more likely to get a good crop from certified seed potatoes.

Before planting expose seed potatoes to light to start shoots growing. Avoid direct sun as this can burn or par-cook the seed! Let the potatoes grow shoots up to 1 cm long - this can take a few weeks. In hot or dry climates sprout seed potatoes in seed trays of dampened potting mix.

Large seed tubers can be cut into pieces - just make sure each piece has at least one 'eye' or shoot. Let the cut pieces dry for a few days before planting or else they will probably start rotting.

Growing in the ground

Prepare the soil by digging in plenty of well-rotted animal manure or compost (don't use fresh manure as it will 'burn' plants). Dig a trench for the seed potatoes about 30 - 40 cm wide and 10 - 20 cm deep. Add a bit more compost/manure to the bottom of the trench and cover with some soil. Put seed potatoes 20 - 30 cm apart in the trench, shoot-side up. Fill in the trench to cover the potatoes.

As potato shoots start to appear, cover them up with soil from either side of the trench. 'Hill up' the crop this way a few times in the first four or five weeks of growth, which gives the potatoes an nice loose mound of soil in which to grow. Now leave the shoots to develop on to form leaves.

Keep potatoes well-watered. The soil should be damp enough to stick to your fingers.

No-dig and container growing - ideal for home gardens.

If you don't have a ton of space then no-dig and container growing both work well for home garden growing. Using container growing you can produce potatoes in any handy space, even on balconies.

No-dig

Make a no-dig bed of potatoes by layering newspapers (or flattened cardboard boxes) at least six layers thick on an area to be planted. Spread your seed potatoes on top of the newspapers about 30 cm apart, trying to get the shoots pointing upwards.

Cover the potatoes with layers of compost, weed-free straw, rotted animal manure, and other mulch materials, until the potatoes are covered by about 20 - 30 cm. Don't flatten the cover down.

Water well. As the potatoes start to grow through, add more layers of mulch material and keep watered. After about four weeks of growing through and covering up, let the potatoes grow on without covering. As the mulch breaks down keep adding more mulch to keep the tubers covered.

Container growing

Get a container at least 40 - 50 cm deep with holes in the bottom for drainage. Shrub-sized flower pots work well. An old wheelbarrow will work if holes are drilled in the bottom. You can also make a 'container' using loose bricks or chicken wire.

Put about 10 - 20 cm of mixed compost and potting mix in the bottom of the container and put your seed potatoes on top, about 30 cm apart. Cover with about 10 - 20 cm of compost mixed with mulch (straw, grass clippings. Water well.

As the potato shoots start to grow through, cover up with more compost and mulch mix and keep watered. Keep on covering up for about four weeks (but stop if you reach the top of the container!)

For both no-dig and container growing, keep the mulch well watered - wet enough to stick to your fingers but not sopping. If the potatoes dry out they will probably go scabby.

  • The longer potatoes grow, the bigger the tubers will be.
  • Don't grow potatoes in the same place as other solanaceae crops as they share many diseases - for example, don't grow potatoes to follow a tomato crop, or vice-versa.
  • You can start harvesting a few tubers as soon as they are big enough to eat - dig around under the plants and retrieve a few, and cover up the rest to keep growing.
  • Potatoes exposed to light will go green, so keep them covered up with straw and soil as they grow. Green potatoes are poisonous!
  • Potatoes accumulate cadmium and other heavy metals, so avoid fertilizers which contain these elements. Similarly, avoid using tyres as containers for growing potatoes as they can leach heavy metals.

Culinary hints - cooking and eating Potato

Peeled or unpeeled and scrubbed, potatoes can be boiled, baked, fried and roasted. - The only way they are not used is raw.

Keep in a pot of cold water after peeling, otherwise they will discolour.

Your comments and tips

25 Jan 13, Donna (USA - Zone 8a climate)
Can sweet potatoes grow successfully in my area?
28 Jan 16, Mary (USA - Zone 10a climate)
I am trying to find a white potato to purchase now. Planting season for potatoes is growing short. Do you sell Zone 10a seed potatoes I may purchase now.
17 Jul 16, Linda (USA - Zone 7a climate)
You can just buy organic potatoes at the grocery store. I've done that many times with good results.
14 Jul 16, Selma (USA - Zone 10b climate)
Is it to late In the season to start potatoes in zone 10b?
04 Mar 18, Daniel Etheridge (USA - Zone 8b climate)
when is the Correct time to plant Sweet Potatoes in (zone 8b) ?. apple California 92308
23 Jun 18, JAI (USA - Zone 7b climate)
Can I have a 2nd planting of seed potatoes in very late/early July in containers?
18 Jul 18, Deb Smith (USA - Zone 7b climate)
Can we grow tomatoes in early August in Zone 7 to harvest by Thanksgiving?
05 Jan 20, Veronica (USA - Zone 7a climate)
I'm not quite sure of my zone. I live in Charlotte, NC 28208. Can you please tell me? Check here www.gardenate.com/zones/#zone-US (Editor)
05 Feb 20, Lee Godfrey (USA - Zone 7a climate)
How much sun do potatoes need.. Can they be planted in the morning shade and evening sun
06 Feb 20, Anon (Australia - arid climate)
Most plants need about 5 + hrs. Look it up on the internet, google it.
Showing 1 - 10 of 67 comments

Can we grow tomatoes in early August in Zone 7 to harvest by Thanksgiving?

- Deb Smith

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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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