Potatoes: a whole new language

A lot of gardeners have Easter marked as the time to start planting their potatoes. I guess it’s the prospect of a long weekend in the garden or on the allotment that turns our thoughts to planting spuds.

But before you start digging, do you know your ‘first earlies’ from your ‘maincrops’? Have you heard of ‘indeterminates’ and ‘determinates’? What are ‘seed potatoes’ and do you need to ‘chit’ them? Yes, the humble potato (Solanum tuberosum) comes with a language all of its own.

Freshly harvested potatoes

Seed potatoes

Seed potatoes are potatoes from last year’s harvest that you grow this year’s potatoes from. It’s fine to use a few tubers from your previous crop if they have stored well over winter and look healthy. However, using potatoes from your own crops year after year runs the risk of carrying over any disease that might be present. With that in mind, it is also important not to grow potatoes in the same soil each year, as pests and diseases are likely to build up.

In general, it’s best to use a fresh stock of seed potatoes from a garden centre or online catalogue. They will be virus free and guaranteed to give you a tasty, disease-free crop. There will also be plenty of varieties to choose from.

Potatoes chitting on a window sill
Seed potatoes guaranteed to be virus free

Although it is possible to grow potatoes from store-bought eating potatoes, you won’t get the same disease-free guarantee. If you decide to try this, make sure you buy organic as some eating potatoes are treated with a chemical that prevents sprouting.

First earlies, second earlies and maincrop potatoes

These terms simply relate to the time when you plant and harvest your potatoes. First and second earlies (new potatoes) are often planted at the same time, with second earlies being ready for harvesting a few weeks later than first earlies. Maincrop potatoes are generally planted a bit later, take longer to grow and are harvested later in the year.

When to plant potatoes

There is no hard and fast rule for when you should plant potatoes. It will depend on the temperatures in your region. Later planting (up to a couple of weeks before your last frosts) simply means later harvests, so don’t panic if you can’t start planting over the Easter weekend! As a very general guide…

First earlies can be planted around the end of March/early April for harvesting 10–12 weeks later in June/July. They are the earliest to crop, hence the name ‘first early’. Popular varieties of first early potatoes include:

  • Arran Pilot
  • Duke of York
  • Foremost
  • Orla
  • Pentland Javelin
  • Rocket
  • Sharpes Express
  • Swift

Second earlies can be planted in mid-April for harvests 14–16 weeks later from July onwards. Popular varieties of second early potatoes include:

  • Charlotte
  • Estima
  • Jazzy
  • Kestrel
  • Maris Peer
  • Ratte

Both first and second earlies tend to be small and flavoursome new potatoes, ideal for boiling and steaming. They are best eaten soon after harvest.

Main crop potatoes can be planted in mid- to late-April for harvesting after 15–20 weeks from late August onwards. Popular main crop varieties include:

  • Cara
  • Desiree
  • King Edward
  • Maris Piper
  • Navan
  • Pink Fir Apple

Maincrop potatoes tend to be bigger than first and second earlies and can be baked, roasted or fried. They also store well over winter.


Chitting is the process of forcing seed potatoes to start sprouting a few weeks before they are planted out (see How to chit potatoes). Left in a cool dry place in the light, the ‘eyes’ of seed potatoes produce stubby sprouts called ‘stolons’. When planted below ground, the stolons grow upwards to create the new potato plant.

Chitted potatoes, ready to plant
Chitted and ready to plant

Chitting is a good way of getting early varieties off to a head start so that they get growing quickly when they are planted, but it isn’t essential.

Indeterminate versus determinate potatoes

I only discovered these terms a few weeks ago and they will completely change the way I grow my potatoes this year, as indeterminate and determinate potatoes have different growth habits.

Indeterminate potatoes produce their crop at intervals along the growing stem in multiple layers. As the plant grows up you need to keep covering the stem (‘earthing up’) so that the layers of potatoes remain underground. You need vertical space for this type of potato and they take longer to grow than determinate varieties. Most (but not all) maincrop potatoes are indeterminate.

Determinate potatoes grow in a single layer just below the seed potato in the top layer of soil. They will benefit from a layer of mulch as they grow to ensure any tubers that break through the surface are protected from the light. The plants do not grow very tall and flower earlier than indeterminate varieties. Most (but not all) early varieties are determinate.

Growing potatoes in containers

With limited veg-growing space, I’ve always grown my potatoes in sacks. For years I’ve been planting 2 or 3 potatoes deep in each sack and ‘earthing up’ around the stems as they grow, thinking that they are growing layers of potatoes. But it turns out that most of the varieties I’ve been growing are ‘determinate’ and have therefore been growing in a single layer. So, this year, I will still plant them in sacks, but I will plant 2 seed potatoes in the bottom third of the sack, then another 2 in the next third. In theory, I should get double the harvest in the same space. Result!

Potato sacks in leaf
Sacks of potatoes

Whatever type or variety of potato you decide to grow, and whether you chit or not, there is nothing more satisfying than harvesting flavoursome home-grown potatoes.

Homegrown Charlotte potatoes
Homegrown Charlotte potatoes

So let me know what you’re growing this year and any potato-growing tips you want to share.

February 2022: end of month review

The weather has definitely hampered quality time in the garden this month. It has been cold, wet and blustery. The UK was hit by several major storms, with Storm Eunice wreaking particular havoc in the south of England.

So, although I’ve been itching to start tidying the borders, they have been best left alone. The winter’s debris has provided a comforting duvet of protection from regular frosts over tender new growth…

The February garden
The February garden: a tangled mess of winter structure

…and a haven for insects and other wildlife, sheltering from the inclement weather.

Protective winter structure in the borders
Protective winter structure in the borders

Pockets of colour

Most of the garden is a brown-beige tangle of dead stems and seedheads, but pockets of colour have begun to shine through.

Pockets of colour in the February garden
Splashes of colour around the garden: crocuses, snowdrops, rose hips, aconites, hellebores and pansies

At the shady end of the garden, a few delightful clumps of snowdrops and aconites were the first of the spring bulbs to emerge.

Snowdrops and aconites

With cheery crocuses soon joining the party.

Crocuses bring colour to shady areas

February jobs

Although I left the borders to their own devices, I still managed to get on with a few jobs. I tidied the shed, cut down the autumn raspberry canes and planted a few more snowdrops.

Planting snowdrops in the green
Planting snowdrops in the green

I unearthed my dahlia tubers from winter storage…

Unearthing dahlia tubers from winter storage

…and potted them up.

Pot up dahlia tubers

I harvested the last of 2021’s potatoes, which had overwintered well outside in the sacks that I grew them in.

Final harvest of last year's potatoes
Final harvest of last year’s potatoes

And started chitting new seed potatoes for this year’s crop.

The right kind of chit: short, knobbly, green sprouts
Chitting seed potatoes on a window sill

I even started a few indoor sowings.

First sowings: tomatoes, aubergines, chillis and lettuce
First indoor sowings: tomatoes, aubergines, chillis and lettuce

Improving areas

It was also gratifying to see some improvement in a couple of the garden’s problem areas.

Autumn-planted hellebores appear to be thriving in a previously problem area under an apple tree.

Hellebores thriving under an apple tree

And the strip of soil next to the curb in the front garden is looking tidier after a bit of weeding and extra planting.

Curbside progress
Curbside progress: snowdrops and primroses

Lunchtime walks

When I haven’t been in the garden, I’ve taken my 15 minutes of green further afield, enjoying some short walks around my Hampshire village and along the Basingstoke canal.

Basingstoke canal in February
Canal walk

In the churchyard, storm Eunice brought down huge clumps of mistletoe from the trees.

Mistletoe brought down from trees during storm Eunice

But early blossoms somehow remained intact.

First blossom in February

And I particularly enjoyed seeing larger swathes of snowdrops than I’ve managed to achieve (yet) in my garden.

Naturalised snowdrops

Patio pots

Back in the garden, the pots on my patio are slowly transforming, from early shoots to first blooms.

First blooms of the year in patio pots
From early to late February, the first layer of bulbs in my pots are starting to emerge

An early sign of wonderful things to come.

First iris of 2022
First iris of 2022