Beginners SectionContainer Growing

When To Start Growing Potatoes

When to plant seed potatoes

Freshly harvested maincrop potatoesPotatoes have a long growing season and with a little crop management their continued production can be easily maintained. It is good practice to understand when to start growing potatoes. Potatoes can be divided into 3 categories, early, second early and maincrop varieties.

The categories are defined by the length of time they take to reach maturity and by preparing and planting according to these characteristics it is possible to have a steady supply of potatoes harvesting from June through to October. First earlies are ready for harvest after 100 days, second earlies can be lifted around 120 days weeks after planting while maincrop can stay in the ground for up to 160 days, producing a much heavier yield of larger potatoes.

container grown early potatoesThe first and second early varieties, well suited to container planting, reach maturity before pest and blight can develop in the garden producing small clutches of new potatoes. They generally have thin skin and a delicate texture, traditionally steamed and eaten as a salad potato straight from the garden. The shorter growing period and extra protection provided with container or bag cultivation means the seed potato can be planted earlier in the season resulting in an early harvest and the opportunity for a successive sowing.

Chitting potatoes in egg boxAll varieties benefit from chitting before planting by setting the seed potato in a light, frost free room and allowing shoots to develop. Egg cartons are ideal for this. Chitting should be started about six week before planting and will normally result in bringing the harvesting date forward by 3-4 weeks. The potato is ready for planting when the shoot is 1in/25mm long.

Early potatoes can be planted mid-March with second earlies a few weeks later although planting times will vary throughout the country. More northerly areas should be delayed by up to two to three weeks depending on weather and risk of frost. Maincrop varieties are generally planted in April.

The potato year starts in January when seed is delivered and chitting starts, then remains on the gardening calendar through to the late Autumn harvest. In more temperate climates or by using a polytunnel it is possible to grow a second maincrop, planted in late summer, ready for the table at Christmas.


  1. emma

    Love your website & all this information, I have honestly learned more in the last 20 mins than in the last few months of reading books….why won’t books point out that there is not that much point in planting most veg for winter harvest if you don’t have a polytunnel! Love that its an Irish site too so its really relevant to my garden and our climate. Thanks!!

    1. Andrew

      Hi Emma. A very genuine thank you for your kind comments, i am delighted you find our site helpful and that you took the time to let us know. Please let me know if I can help with anything specific.

  2. Lynne Daymon

    Excellent site – just fell across it.
    VERY well written along with intuition information.
    I have my Sowing Potatoes now sitting on the windowsill prior to planting.

    1. Andrew

      Hi Lynne
      Thank you for your kind comment, I am very pleased you found the article helpful and found it clear and easy to read. I hope you have great season and that your potatoes turn out well. Andrew

  3. Brendan Ó Regan

    Hi I’m living in youghal Co Cork and I have made up a 3 by 4 foot raised bed… I have got British Queens and Kerr Pink’s… Just wondering the best time of the year to plant them or can I plant them now… And If I do would I have to cover them if theres Frost, also how many patoes can I grow in the raised bed aswell.. Thank you

  4. Sue

    Thanks for this useful information. I am chitting potatoes at the moment and never knew that the shoots should be approx 25 mms long before planting. Haven’t grown anything for a few years. Thanks again.

  5. Paul Flynn

    Can I grow seed potatoes in a growbag in Mid June? The lockdown stopped me from doing anything in March/April? I’m in Ireland – temperatures are quite high.

    1. Andrew

      Hi Paul. Yes, you can grow first and second earlies in June (as they are quicker to mature than maincrop). We have supplies of seed potatoes available on the site.

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