Your complete guide to vegetables and gardening tasks for January in the UK climate. While January is typically a quieter month in the garden, it's an excellent time to plan ahead and start certain crops indoors.
Sow Indoors
Onions, leeks, broad beans (in pots), forced rhubarb
Harvest Now
Kale, leeks, Brussels sprouts, parsnips, celeriac, stored roots
Key Tasks
Order seeds, plan crop rotation, chit potatoes, clean tools
What to Sow in January
Onions and Leeks (Indoors)
January is the ideal time to start onions and leeks from seed indoors. Both are slow-growing and need a long season to reach a good size. Sow onions thinly in a tray of seed compost, cover with vermiculite, and keep at 10–16°C. Leeks can be sown in modules (3–4 seeds per cell) at the same temperature. Germination takes 14–21 days.
Broad Beans (Indoors)
In colder regions or where outdoor conditions are harsh, broad beans can be started in pots in a cool greenhouse or coldframe. Sow one bean per 7.5cm pot, 5cm deep. This gives them a head start before transplanting outdoors in February or March when conditions improve.
What to Harvest in January
- Kale — one of the hardiest crops; harvest outer leaves throughout winter
- Leeks — harvest as needed from the ground through to March
- Brussels Sprouts — harvest from the bottom upward; flavour improved by frost
- Parsnips — leave in the ground until needed; sweetest after hard frosts
- Stored crops — check squash, potatoes, onions, and garlic in store; remove any showing signs of rot
Key January Tasks
Order Seeds Early
January is the most important month for seed ordering. Popular varieties of tomatoes, squash, and heritage potatoes sell out by February. Browse seed catalogues now and order everything you need for the season. The RHS vegetable growing guides are a useful reference for variety recommendations.
Plan Crop Rotation
Draw a rough sketch of your beds and plan which crop families go where this season. The basic rule: brassicas, roots, legumes, and alliums should not grow in the same bed two years running. This reduces pest and disease buildup and improves soil health over time.
Chit Seed Potatoes
From mid-January onwards, arrange seed potatoes rose-end up in egg boxes or trays in a cool, bright, frost-free place. Short, stubby green or purple shoots of 1–2cm are what you’re aiming for. Avoid leggy, pale shoots caused by insufficient light.
Clean and Sharpen Tools
Use the quieter winter months to oil metal parts, sharpen hoe and spade edges, replace worn handles, and clean pots and trays with a dilute disinfectant solution. Well-maintained tools are safer and far more effective.
Force Rhubarb
Cover an established rhubarb crown (at least 2 years old) with a forcing pot, large upturned bucket, or purpose-made forcer in January. Exclude all light. Forced stems will be ready to harvest in 4–6 weeks — pale pink, sweet, and far more tender than outdoor-grown stems.
What Not to Do in January
- Don’t sow tomatoes, peppers, or aubergines yet — too early without supplementary lighting; leggy seedlings result
- Don’t dig frozen or waterlogged soil — it destroys soil structure
- Don’t leave pots and containers standing in saucers filled with water — roots will rot
Plan Your Whole Year — UK Vegetable Garden Planner PDF
Month-by-month sowing and planting schedules, crop rotation charts, and companion planting guides — all in one printable PDF.
Get the UK Garden Planner →Recommended Tools & Supplies
Frequently Asked Questions
What can I plant in January in the UK?
January planting is mostly indoors. Start onions and leeks from seed on a warm windowsill or propagator, sow broad beans in pots in a cool greenhouse, and chit seed potatoes. Outdoors, you can plant garlic and hardy broad beans in mild areas with well-drained soil.
Is it too early to start seeds in January?
For most crops, yes. Tomatoes, peppers, courgettes, and squash started in January produce leggy, weak seedlings without supplementary lighting. The only crops worth starting in January are slow-growing ones that need a long season: onions, leeks, and broad beans.
Can I grow vegetables in January in the UK?
Yes — kale, leeks, Brussels sprouts, and parsnips can all be harvested fresh from the garden in January. With a cold frame or polytunnel, winter salad leaves (lamb’s lettuce, land cress, spinach) can also be harvested through winter.
What To Plant In January UK
In January, UK gardeners can sow broad beans in mild areas, hardy peas under protection, and winter salads only where soil is workable. You can start onions, leeks, lettuce, early peas, broad beans, microgreens and herbs under cover, plant out garlic or onion sets only if conditions are mild, free-draining and not frozen, and harvest leeks, kale, winter cabbage, Brussels sprouts, parsnips, chard and protected salads.
| January task | Good UK options | Notes |
|---|---|---|
| Sow outdoors | Broad beans in mild areas, hardy peas under protection, and winter salads only where soil is workable. | Check soil moisture and local frost risk before sowing. |
| Seeds to start indoors or under cover | Onions, leeks, lettuce, early peas, broad beans, microgreens and herbs. | Protected sowings help you control temperature, pests and watering. |
| Vegetables to plant out | Garlic or onion sets only if conditions are mild, free-draining and not frozen. | Water transplants well and protect young plants where weather or pests are likely. |
| What to harvest | Leeks, kale, winter cabbage, brussels sprouts, parsnips, chard and protected salads. | Harvest little and often, then record what clears space for the next crop. |
Vegetables to sow outdoors in January
Sow broad beans in mild areas, hardy peas under protection, and winter salads only where soil is workable. Use small repeat sowings where possible so the harvest is easier to manage and gaps do not sit empty.
Seeds to start indoors or under cover
Start onions, leeks, lettuce, early peas, broad beans, microgreens and herbs under cover. This is useful when outdoor conditions are too cold, too dry, too exposed or too pest-prone for reliable germination.
Vegetables to plant out
Plant out garlic or onion sets only if conditions are mild, free-draining and not frozen. Match the planting window to your local weather and give new plants enough water while roots establish.
What to harvest in January
Harvest leeks, kale, winter cabbage, Brussels sprouts, parsnips, chard and protected salads. Keep notes on what performed well so next year's plan is based on your own garden rather than memory.
Jobs for the vegetable garden in January
Order seeds, clean trays, map beds, check fleece and cloches, plan crop rotation and prepare labels before the main sowing season.
Common mistakes in January
Avoid sowing too early without enough light, planting into frozen or waterlogged soil, and skipping the bed plan before spring.
Printable monthly checklist
For January, write down four columns: sow outdoors, start under cover, plant out and harvest. Add one line for weather notes, one for bed space, and one for the next crop so the month turns into a practical plan.
Related UK planting guides
Use the vegetable planting calendar UK, compare what to plant in December UK and what to plant in February UK, then check when to plant vegetables UK, seed starting tools UK and UK allotment planner.
FAQ section
What vegetables can I plant in January in the UK?
In January, UK gardeners can sow broad beans in mild areas, hardy peas under protection, and winter salads only where soil is workable. You can start onions, leeks, lettuce, early peas, broad beans, microgreens and herbs under cover, plant out garlic or onion sets only if conditions are mild, free-draining and not frozen, and harvest leeks, kale, winter cabbage, Brussels sprouts, parsnips, chard and protected salads.
What seeds can I sow outdoors in January?
In January, outdoor options include broad beans in mild areas, hardy peas under protection, and winter salads only where soil is workable. Adjust the list for your local soil, weather, frost risk and available protection.
Can I sow seeds in January in the UK?
Yes, but keep it selective. January is mainly for protected sowings such as onions, leeks, early peas, broad beans, microgreens and hardy salads, not for rushing tender crops.
Turn This Month's Jobs Into A Plan
Month-by-month advice works best when it becomes a written sowing list, bed plan, and follow-up task list.
Plan the next step
Use the printable UK Vegetable Garden Planner to turn this guide into sowing dates, bed layouts, and weekly garden tasks.