What can I sow in January in Scotland?

Onions. These follow RHS UK timing — in much of Scotland lean to the later end of each window, and later still in the north and at altitude. Check your local last frost with the Frost Date Calculator.

Is it frost-free in January in Scotland?

Mid-winter: hard frosts are the norm everywhere, lowlands and uplands alike. Frost varies sharply over short distances, so treat these as regional averages, not garden predictions.

January in the Scottish Garden

❄️ Winter📅 RHS timing, Scotland-adjusted🌡️ Met Office frost bands

The quiet turn of the year: plan, order and dream more than dig.

The month ahead

January in a Scottish garden is mostly about waiting. The ground is cold or frozen, the days are short, and nothing is in a hurry. That is fine. This is the month to get ahead of the season rather than fight it. Order your seed potatoes and onions now while the catalogues still have the varieties you want. Plan your rotation on paper before the first seed trays come out and you are too busy to think about it.

If you garden on heavy clay, stay off the beds entirely. Walking on wet, frozen ground compacts it into something that will fight you all summer. If you are on free-draining soil, you can still work on frost-free days: dig in compost, firm back any plants lifted by frost, and check that cloches and netting are still secure after the winter gales. The real work this month is indoors. Wash every pot, tray and propagator you own. Sharpen your tools. Clean the greenhouse glass; the algae and grime that built up over autumn cuts the light your seedlings will depend on in a few weeks.

What to do in January

Sow indoors

Under cover: windowsill, heated propagator or greenhouse.

Onions

Sow outdoors

Direct into prepared ground (or under a cloche/fleece where noted).

Too cold or too late for direct outdoor sowing of our crops this month.

Plant out

Move transplants, sets, tubers or cloves into their final spot.

Harvest

Ready to pick or lift this month (windows are approximate).

Fruit & ornamentals

Prune apple and pear trees now, while they are fully dormant. The tree is not growing, so every cut you make is a decision about where growth will go in spring. Take your time. Cut out dead, diseased and crossing branches first, then step back and look at the shape before taking anything else. Check stored dahlia, begonia and canna tubers. If they are shrivelling, move them somewhere cooler. If they are soft or mouldy, cut out the rot and dust the wounds with sulphur. A five-minute check now saves losing the lot. If you forced rhubarb, leave the crown uncovered after forcing; it needs a full season to recover.

Loppers cutting a bare crossing branch that rubs against another branch on a dormant apple tree — Cut out dead, diseased and crossing branches first, then step back and look at the shape.

Wildlife

Put out food and fresh water for birds and keep it topped up. They are your pest control army for the season ahead. A pair of blue tits feeding caterpillars to a nest of chicks will clear more aphids than any spray. Leave a corner of the garden untidy a little longer; the hollow stems and leaf litter are where overwintering insects and hedgehogs are sheltering.

Key jobs in January

Order seed and seed potatoes early while varieties are in stock.
Plan the year's beds and crop rotation before the season runs away.
Prune apple and pear trees while fully dormant; now is the ideal window.
Force rhubarb by covering crowns with a forcing pot or upturned bin.
Check stored onions, garlic and potatoes for rot and remove any that are softening.
Clean, wash and disinfect pots, trays and the greenhouse ready for spring.
Inspect stored dahlia, begonia and canna tubers for drying out or rot.
Put out food and fresh water for birds; they are your pest control army.
Firm back any autumn transplants (leeks, brassicas) lifted by frost.
Service and sharpen tools while the shed is quiet.

The Scottish picture this month

The coldest, darkest stretch. Ground is frequently frozen or waterlogged and day length is too short for strong seedling growth without a grow light. Every Scottish region is deep in its frost season.

Frost: Mid-winter: hard frosts are the norm everywhere, lowlands and uplands alike.

Region-aware toolFrost Date CalculatorYour local last and first frost bands: the single most useful number for timing everything above.

Watch out for

Vine weevil (larvae)

The lethal stage: grubs eat roots from autumn to spring, worst in pots and containers. Check the roots of any plant that wilts for no clear reason.

Sources

RHS: grow-your-own guides: sowing, planting and harvest timing for all 25 crops (each window hand-derived from the crop's own RHS prose)
GrowScotland: pest activity framing: which pests to flag each month is our own reading of RHS activity data. We surface only what RHS sources, and frame weather-driven diseases by trigger conditions rather than inventing a Scottish calendar