An allotment year does not run in a straight line. It loops – the decisions made in November shape what happens in March, the seeds ordered in January determine what gets harvested in August, and the ground preparation done in autumn is the foundation everything else grows on. Once you start thinking of the allotment as a cycle rather than a sequence of separate months, it becomes far less overwhelming and far more productive.

This guide covers every month from January to December. Each section gives full coverage of what to sow, plant, harvest and maintain – with the reasoning behind the timing, the decisions that matter most that month, and what to watch out for. Dates are central England averages. Allow two to three weeks later in Scotland and exposed northern uplands, and two to three weeks earlier in sheltered southern and coastal plots. But always let the conditions on your specific plot override any date on paper.

How to use this guide

The most important principle for working any growing calendar is this: work with conditions, not with dates. A hard frost in late April can undo a week of outdoor planting. A warm, settled February can allow crops that normally wait for March to go straight in. A calendar tells you what is typically possible in a given month. Your soil temperature, your weather forecast and the state of your plot tell you whether it is actually the right time to do it.

There is no shortcut to good plot knowledge. A notebook recording what you sowed, when it germinated, what produced well and what failed is worth more than any printed guide after two or three seasons. Not because guides are wrong, but because your plot is specific – its drainage, its frost pocket, its soil type, its aspect – and only your own records reflect that specificity accurately. Start a growing diary this year if you have not already, even if it is just brief notes on your phone after each visit.

A few practical tools make following this calendar significantly easier. A cold frame or set of cloches extends your effective sowing and planting windows by several weeks in both spring and autumn, protecting sowings from late frosts and keeping autumn crops going longer than bare ground would allow. A heated propagator or warm, sunny windowsill allows tomatoes, peppers and aubergines to be started in January or February without risk – crops that need the longest possible UK growing season. Horticultural fleece is probably the single most useful emergency tool on the plot, able to protect newly planted tender crops from an unexpected frost in minutes. Keep a roll of it to hand from March through May.

Winter – January and February

January

January is the planning month. Almost nothing grows outdoors in most parts of the UK, but this is not dead time – it is when the decisions that shape the entire growing year get made. A plot holder who spends January thinking clearly about rotation, variety selection and soil improvement will have a noticeably more productive season than one who picks up where they left off in autumn without reflection.

The first priority is seeds. Order as early in January as possible – popular varieties of tomatoes, courgettes, heritage brassicas and many onions sell out by February. Ordering early also gives you time to organise what you have versus what you need, rather than discovering gaps when sowing windows open. While ordering, sketch a rough rotation plan: brassicas, legumes, alliums and root crops should all be moving to new beds, not returning to where they were last year. Good crop rotation is the single most cost-free thing you can do to manage soil-borne disease and maintain fertility across the whole plot.

On any mild January day, get onto the plot and spread well-rotted manure or garden compost on empty beds. You can dig it in lightly or simply leave it on the surface for worms to work in – either approach is fine, but getting organic matter in early gives it more time to integrate before spring sowing begins. January is also when chitting begins: stand seed potatoes rose-end up in trays in a cool, light, frost-free location. The aim is short, green, sturdy chits – not the long, pale, etiolated shoots you get if they are kept too warm or in the dark. Most chitting takes four to six weeks, which means mid-January chitting lines up with mid-March planting for early varieties.

Apple and pear trees should be pruned while fully dormant in January. This is one of the easier gardening tasks of the year since the branch structure is clearly visible without leaves, and any dead, diseased or crossing wood is straightforward to identify. Keep an open centre on bush-trained trees to let light and air penetrate. January is also the right time to check all tools, clean and sharpen them, and replace anything that will not see another season. Blunt spades and hoes make hard work harder. A well-maintained tool set makes the busy months feel easier.

February

February is when the growing year begins to stir in earnest, but patience matters more than enthusiasm. Soil temperatures are still low in most of the UK and weather can swing from mild and workable to frozen and sodden within a matter of days. The temptation to rush outdoors and start sowing is strong – resist it. Soil that is too cold, too wet or too compacted will hinder rather than help germination, and sowing into poor conditions sets plants back rather than giving them a head start.

Under cover, February is one of the most important sowing months of the year. Tomatoes, peppers, chillies and aubergines should all be started in a heated propagator now – these crops need the longest possible growing season and benefit from the earliest indoor start. Maintain propagator temperature around 18-21°C for good germination. Onions, leeks and early peas can also be sown under cover. Peas raised indoors in lengths of guttering can be slid out and planted as a strip when outdoor conditions improve, which avoids disturbing the roots.

In milder areas and on sheltered plots, broad beans can be sown directly outdoors in February if the ground is neither frozen nor waterlogged. Check the soil: if it sticks heavily to boots and compacts under pressure it is too wet to work. If it crumbles reasonably it is workable. Forcing wet soil causes compaction that can persist for months. Cover empty beds with black polythene, cloches or horticultural fleece now to begin warming the soil for March sowing. The temperature difference achievable with even a simple clear cloche is significant and can bring forward outdoor sowing by two to three weeks.

February is also when the forcing of rhubarb produces its best results. Place a large bucket, forcing pot or inverted bin over established crowns to exclude light entirely. The young shoots that emerge in darkness are pale, tender and far sweeter than outdoor rhubarb. Forced rhubarb is typically ready to cut within four to six weeks of covering.

Early spring – March and April

March

March is the turning point of the allotment year. Soil temperatures begin rising, day length increases noticeably, and the range of tasks that are viable outdoors expands rapidly. It is also the month where enthusiasm most often runs ahead of conditions – and where the worst mistakes are made. Sowing into cold, wet soil or planting out without checking the forecast are March errors that cost weeks in plant recovery time. A soil thermometer is worth every penny: most vegetable seeds need soil at or above 7°C to germinate reliably, and many do better above 10°C.

Early potatoes can go into the ground from mid-March in the south and on sheltered plots – check that the soil is workable and that no frost is forecast for the coming week. In colder areas and exposed plots, wait until April. Plant chitted tubers around 25cm deep and 30cm apart in rows, in a trench or individual holes. Earth up gently once the first shoots emerge to protect them from late frosts and begin the process of mounding that encourages tuber development.

Outdoor sowing begins properly in March. Onion sets and shallots can go in once the soil is workable, with just the tips showing above the surface. Garlic that was not planted in autumn can still go in now, though autumn-planted garlic generally produces larger, better-wrapped bulbs. Parsnips should be sown directly as soon as soil temperature allows – they need a long growing season and are one of the few crops worth sowing in genuinely cold soil since germination is slow regardless. Broad beans not yet sown go in now.

Under cover, the propagator continues to be busy. Courgettes, cucumbers, squash and celery can all be started indoors in March for planting out in May. Brassica seedlings raised earlier should be pricked out into larger cells once they have their first true leaves. Prepare seedbeds on the plot thoroughly – remove winter weeds, rake to a fine tilth and apply a balanced general fertiliser to beds intended for direct sowing. March is also the last month for planting bare-root fruit trees and bushes before growth begins; after this point, container-grown stock is the only option.

April

April is when the allotment comes alive and the workload increases sharply. Frost remains a real risk for most of the month across the UK – last frost dates vary enormously, from early April in sheltered southern gardens to mid-May in exposed northern uplands. Keep fleece to hand and check forecasts before planting anything that cannot tolerate cold. The consequences of misjudging this are real: courgettes, cucumbers and basil will be killed outright by a single frost; tomatoes and peppers suffer cold damage that weakens them for weeks.

Main crop potatoes go in during April, spaced 35-40cm apart in rows 70-75cm apart. Jerusalem artichokes and asparagus crowns can be planted in April – asparagus is a long-term investment that takes three years before the first proper harvest but produces prolifically for twenty years or more once established. Succession sowing becomes important from April onward: rather than sowing an entire row of salad at once and facing a glut followed by a gap, sow a short row of lettuce, radishes and spinach every two to three weeks. This simple habit produces a continuous supply through summer.

April is also when the soil improvement work from winter starts showing its value. Beds that received compost or manure in autumn or over winter are noticeably easier to rake, faster to warm and more forgiving of early sowing than neglected beds. If preparation was not done, incorporate compost before sowing and allow a week or so for it to settle before direct sowing fine-seeded crops like carrots or parsnips – freshly incorporated compost can make soil surface conditions uneven and patchy.

Late spring – May and June

May

May is the peak month for sowing and planting and typically the most demanding month of the allotment year. The workload is at its highest because multiple things must happen at once: tender crops go out after the last frost, ongoing succession sowing continues, potatoes need earthing up, and the first real harvests begin to appear. Visits to the plot every two to three days are ideal in May – leaving a fortnight between visits means returning to chaos.

The defining event of May is the last frost date. In most parts of England this falls in the first or second week of the month, though it varies significantly by location and year. Once the frost risk has passed, all the tender crops that have been growing under cover go outside: courgettes, squash, runner beans, French beans, sweetcorn, outdoor tomatoes, cucumbers and basil. Harden them off first by putting them outside during the day and bringing them back under cover at night for seven to ten days. A plant moved directly from a warm greenhouse to a cold outdoor position suffers a check in growth that can take weeks to recover from – the hardening off process is not optional.

Earth up potatoes as the haulms grow, covering any shoots above the soil surface to prevent frost damage and encourage tuber development. This needs doing two or three times as growth accelerates through May. Watering becomes increasingly important as temperatures rise and plant growth accelerates – newly transplanted tender crops in particular need consistent moisture at the root to establish well. A slow, thorough soak once or twice a week is far better than light daily watering that wets only the surface and encourages shallow rooting.

Slug control is particularly important in May. Young transplants straight out of sheltered growing conditions are at their most vulnerable, and slugs can strip a newly planted courgette overnight. Check under boards, pots and any debris on the plot in the evenings. Iron phosphate pellets are effective and safe for wildlife when used sparingly. Nematode treatments applied to moist soil from May onwards provide sustained protection through the most vulnerable weeks. Keep weeding consistent – weeds grow as fast as crops in May and can get significantly ahead of you if a wet week prevents access to the plot.

June

June is one of the most rewarding months on the allotment. The work put in over winter and spring begins paying off properly – early salads are ready to cut, broad beans and peas come in from late June, early new potatoes can be lifted once the flowers have opened and faded, and strawberries arrive. At the same time the ongoing work of succession sowing, watering and weeding continues. The plot in June is both generous and demanding.

Leeks can be planted out this month from seedlings raised indoors in February or March. Transplant them into deep holes made with a dibber, drop them in and water without backfilling the hole. As the leek grows it fills the hole from the sides, which blanches the lower stem to produce the white shaft that makes leeks so useful in cooking. Brassica plants raised under cover – purple sprouting broccoli, kale, winter cabbage, winter cauliflower – go out in June once hardened off. Net them immediately after planting against cabbage white butterflies, whose caterpillars can reduce a kale plant to a skeleton in days, and against pigeons, which will attack young brassica transplants at any time.

Pinch out the growing tips of broad bean plants once the first cluster of flowers has set. This removes the soft new growth at the top of the plant, which is the preferred feeding site for blackfly, and redirects the plant’s energy into pod development rather than further upward growth. Earthing up of maincrop potatoes should continue through June. Keep succession sowing of salads, radishes, beetroot and spinach going – it is very easy to stop in June because the plot looks full, but stopping succession sowing now means gaps in August and September when those crops would be very welcome.

June is also a good month to observe and record. Walk the plot slowly and assess what is working and what is not. Are there pest or disease patterns developing in certain beds? Is one corner consistently wetter or drier? Is a particular crop consistently ahead of or behind expectation? These observations, noted down in a growing diary while they are current, feed directly into better decisions for next year’s rotation and variety selection.

Summer – July and August

July

July is peak harvest season and demands the most frequent plot visits of the year. The rhythm of summer harvesting is fundamentally different from any other month – rather than visiting and collecting what is ready, July requires inspection of individual crops almost every time you visit and a willingness to harvest slightly early rather than risk leaving things too long. A courgette left three days becomes a marrow. Beans left past their best develop tough, stringy pods. Lettuce uncut bolts and turns bitter. The discipline of harvesting at the right moment, rather than when it is convenient, is what determines whether July produces exceptional flavour or wasted crops.

Courgettes and cucumbers need checking every two to three days in warm weather. Pick courgettes at 15-20cm – young fruits are far superior in flavour and texture to larger ones, and regular picking at this size keeps the plant producing continuously. Allow a courgette to reach marrow size and the plant receives a signal that it has successfully set seed, causing production to slow significantly. The same principle applies to beans: pick French and runner beans while the pods are plump but before the seeds inside bulge visibly through the skin. Toughen pods are not worth harvesting for eating, though they can be dried for seed saving.

Garlic should be lifted once more than half the foliage has yellowed and fallen. Leaving it longer risks the bulb splitting, which ruins the wrapper skins and dramatically reduces storage life. Lift on a dry day, lay the bulbs out on wire mesh or old wooden pallets in a sunny, well-ventilated spot for two to three weeks to cure fully before storing. Onions are ready once the foliage has completely collapsed naturally – do not force the necks down, as this damages the natural seal and invites neck rot during storage. Both garlic and onions need to be genuinely dry before going into long-term storage. Storing soft or damp bulbs is the most common cause of onion and garlic losses over winter.

Despite the harvesting pressure, July is also an important month for maintaining succession sowings and for planning ahead to autumn. French beans, salads, spinach, spring onions, beetroot and turnips can all be sown in July for harvests from September onwards. Sow spring cabbage and kale for planting out in August. Keep weeding – July is when annual weeds compete hardest with crops and can set seed rapidly if allowed to get ahead. Water in the mornings rather than evenings where possible, allowing foliage to dry before temperatures drop, as wet leaves overnight in summer conditions favour fungal disease.

Strawberry runners can be pegged down into small pots of compost in July to produce replacement plants for next year. Garlic and onion beds that have been cleared become available for a second use – a fast-growing catch crop of radishes or salad leaves, or a green manure if the space is not needed. Summer-prune trained apple and pear trees in July to maintain their shape and channel energy into fruit swell rather than vigorous new growth.

August

August marks the transition from the peak of summer to the beginning of the autumn cycle. Harvesting continues at full pace – tomatoes, sweetcorn, cucumbers, peppers, aubergines and maincrop potatoes are all lifting through August – but the sowing calendar has already shifted firmly toward crops that will carry into autumn and winter. Two things are happening simultaneously: the tail end of summer production and the start of preparations for the months ahead.

Tomatoes need consistent watering through August to prevent blossom end rot, a physiological disorder caused not by disease but by calcium deficiency resulting from irregular moisture supply. Feed with a high-potassium liquid feed weekly once the first fruits have set. Harvest tomatoes at the colour stage for the variety being grown – not necessarily red, as many heritage varieties are yellow, orange, green-striped or near-black when fully ripe. The test is a gentle squeeze: a fully ripe tomato gives slightly under pressure. Sweetcorn is ready when the silks at the top of the cob have turned completely brown and dry, and pressing a kernel releases milky liquid rather than a clear one.

Maincrop potato haulms should be cut down to ground level two weeks before lifting to allow the skins to set firm – this substantially improves storage life. Lift on a dry day, leave tubers on the surface for an hour or two to skin over, then store in paper sacks or wooden boxes in complete darkness. Never store potatoes in light – exposure turns the skins green and produces solanine, which is harmful if eaten in quantity. Check stored potatoes monthly through autumn and winter and remove any showing soft spots promptly.

The autumn planting programme begins in August. Overwintering onion sets can go in from late August or early September. Spring cabbages, winter lettuces, land cress, claytonia, spinach, spring onions and oriental greens can all be sown now for harvests through autumn and into winter. Begin clearing spent crops bed by bed – pull out pea and bean plants once their productive run is over, leaving the nitrogen-fixing root nodules in the ground. Compost the haulm. Sow green manures such as phacelia or field beans on beds that will not be planted again until spring, to protect and improve the soil through winter.

Autumn – September and October

September

September is the month for bringing in the main harvest. Maincrop potatoes, squash, pumpkins and the last of the summer crops all need lifting before the first frost arrives. At the same time the planting calendar for the following year begins: overwintering onion sets, garlic, and hardy salad crops all go in this month. The sense of the allotment season coming to a close and immediately beginning again is strongest in September – it is a genuinely transitional month.

Squash and pumpkins should be left on the plant until the skins are rock hard and cannot be dented with a fingernail – this indicates the sugars have concentrated properly and the fruit will store well. Once cut, cure in a warm, dry, sunny spot for ten to fourteen days before moving into long-term storage. Curing hardens the skin further and significantly extends storage life. Well-cured squash stored in a cool, dry, frost-free room will keep for three to five months depending on the variety.

Garlic cloves and overwintering onion sets go in during September and October. Plant garlic 10-15cm apart in rows 30cm apart with the pointed tip just below the soil surface. Autumn-planted garlic has time to establish a good root system before winter and consistently produces larger, better-formed bulbs than spring-planted garlic in most UK conditions. Overwintering onion sets follow similar spacing. Both benefit from a well-drained position – standing water over winter is the most common cause of failure with both crops.

Hardy salads, spinach, claytonia, land cress and winter purslane sown in September under cover or in cold frames will provide fresh leaves through the colder months. These plants do not grow much once day length shortens significantly, but they hold well and remain harvestable right through winter. The key is sowing early enough in September to let them establish a reasonable size before growth slows – plants sown in late September will be very small and much more vulnerable to cold damage than those sown in early September.

September is also when seed saving from the best performers of the season should happen before wet weather or mice take the seeds first. Peas, beans, tomatoes, squash, chillies and many herbs all produce viable seed. Leave seed heads to dry fully on the plant, then harvest into paper envelopes and label clearly with variety and year. Dry seeds stored in a cool, dark, dry location remain viable for several years.

October

October marks the shift from active growing to consolidating and preparing. Harvesting continues – root crops such as carrots, parsnips, beetroot and celeriac can mostly be left in the ground through October and lifted as needed, which saves storage space and keeps them fresher. Parsnips in particular genuinely improve after the first frost, which converts some of their starches to sugars and produces the characteristic sweetness that makes winter parsnips so good.

Hardy brassicas – Brussels sprouts, kale, purple sprouting broccoli and leeks – will carry through winter in the ground and are best left until needed. Brussels sprouts should be picked from the base of the stalk upward as they develop, taking the tightest buttons first and leaving the upper sprouts more time to size up. Kale withstands severe frost without damage and can be harvested right through winter – removing the lower and outer leaves first encourages continued production from the growing tip.

Begin the winter digging programme in October. Clear beds of spent crops, incorporate compost or well-rotted manure, and rough-dig to allow frosts to break down heavy clods through winter. Beds that are rough-dug in October and left over winter require far less effort to bring to a seedbed in spring than beds that were never turned. Weed all beds before growth stops for the year – annual weeds that set seed in October make the following spring’s weeding significantly harder. Protect tender half-hardy perennials such as globe artichokes with a layer of straw or bracken over the crown.

Apple and pear harvesting peaks through October. Test apples by lifting a fruit gently – if it parts from the branch with a slight twist it is ready. Early varieties that drop naturally need collecting promptly as windfalls bruise and rot quickly. Late keepers such as Bramley will not be ready to eat until well into winter even once picked – store them individually wrapped in paper in a cool, dark shed and check monthly.

Late autumn and December

November

November is a month for catching up on tasks deferred through the intensity of the harvest season and completing the groundwork that sets up a strong start next spring. The produce is largely in – or at least well on its way – and the urgency of peak season has passed. This creates a different kind of opportunity: time to do things properly rather than quickly, to address the structural tasks that never get attention when the plot is at its most demanding.

Lift and clean any remaining root vegetables before hard frost arrives and makes lifting impossible. Parsnips can stay in the ground through November and beyond, but carrots, beetroot and celeriac in areas prone to sustained hard freezes are safer lifted and stored in boxes of damp sand in a frost-free shed. Inspect all stored produce weekly and remove immediately anything showing soft patches or signs of rot. One rotting carrot or potato in contact with its neighbours can render a significant portion of the store unusable within days.

Continue winter digging and soil improvement while ground conditions allow. Once the soil freezes, digging becomes impossible, so any work done in November is work saved for a cold January morning. Apply lime to beds that have had brassicas if a soil test suggests pH has dropped below 6.5 – brassicas prefer slightly alkaline conditions and liming also helps suppress clubroot spores over time. Apply a generous layer of well-rotted manure or garden compost to beds earmarked for heavy-feeding crops such as brassicas, squash or sweetcorn next year. Earthworms will incorporate it from below while frost breaks down any remaining large clods from above.

Hardy brassicas, leeks and any salad crops under cover continue to produce through November and provide useful fresh vegetables when little else is available. Begin the annual review of the season while the evidence is still fresh in mind: what grew well, what failed, what variety choices worked and which did not, where the rotation needs adjusting. Writing this down now produces better planning decisions than trying to reconstruct it from memory in January. Prune soft fruit canes this month – cut autumn-fruiting raspberry canes to ground level, and remove old fruited canes from summer raspberries and blackberries while tying in the new ones.

December

December is the quietest month on the allotment. The growing season is over for most crops and the focus is on maintenance, protection and planning. This quietness is valuable – it is the time when the decisions that will shape the following year can be made thoughtfully rather than reactively, when a review of what worked and what did not can drive genuine improvements rather than repeating the same patterns.

Order seed catalogues and start planning for next year. December is a good time to make definitive decisions about crop rotation, what varieties to try and what changes to make to the plot layout based on the season just past. Compare notes against what was recorded through the year. Were there varieties that consistently outperformed expectations? Beds that never quite came right? Problems that recurred despite attempts to address them? This kind of systematic review, while the season is still relatively fresh, produces better growing plans than any amount of general reading.

Plant bare-root fruit trees and bushes in December while they are dormant – they establish well over winter and are ready to grow from the first warm days of spring. This is also when checking that all frames, nets, cloches and structures have survived autumn storms is worth doing, before winter weather causes further deterioration to anything already damaged. Clear the plot of any remaining debris to reduce overwintering sites for slugs, vine weevil grubs and other pests – they overwinter readily in undisturbed material and emerge in spring to target the first new growth of the season.

Check stored vegetables at least once a month and remove any showing signs of deterioration. Potatoes, onions, garlic and squash all keep well if stored correctly but need monitoring – the failure of one item spreads to its neighbours faster than most growers expect. Keep different crops stored separately where possible, as apples and pears in particular release ethylene gas that accelerates ripening and deterioration in neighbouring vegetables.