Rest, review and get ready. The calm before the seed catalogues.

The month ahead

December is the quietest month of the Scottish gardening year. The ground is cold and almost nothing grows outdoors, and that is fine. The real work this month is indoors: sit down with a notebook while the season is still fresh. Which varieties worked and which did not? Which bed was too wet, too dry, too shaded? Was your last frost date about right? Write it down. You will have forgotten by March, and a garden diary is the cheapest way to get better every year. Order seed catalogues now and plan next year's beds and rotation on paper. A plan drawn in December, while this year's lessons are fresh, costs nothing and prevents the mistakes you already made once.

The hardy winter crops are still standing and the stored harvest needs checking, but mostly December is about getting ready: planning, sharpening tools, and making sure everything is set for the first sowings in late winter.

What to do in December

Sow indoors

Under cover: windowsill, heated propagator or greenhouse.

None of our 25 crops is typically started under cover this month.

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).

Key jobs in December

  • Harvest hardy winter crops as needed: leeks, kale, parsnips, Brussels sprouts, winter cabbage.
  • Review this year's successes and failures while they are fresh. Write it down.
  • Clean, sharpen and oil all tools; service the mower and strimmer.
  • Check stored produce and overwintering crops for rot, mice and slugs.
  • Firm back any plants lifted by frost and brush heavy snow off cloches and netting.
  • Order seed catalogues and plan next year's beds and rotation.
  • Check greenhouse heaters and insulation after storms.
  • Wash pots, trays and propagators ready for the first sowings.
  • Prune apple and pear trees on frost-free days; they are fully dormant now.
  • Keep bird baths ice-free and feeders full; your garden's pest control depends on them.

Looking after wildlife

The birds in your garden in December are the same ones that will be hunting caterpillars and aphids in your garden in May. Keeping feeders full and water available through the hardest months is not charity. It is investing in your pest control for the season ahead. Break the ice on ponds with a pan of hot water stood on the surface; never smash it, as the shockwave harms fish and amphibians sheltering at the bottom.

A pan of hot water being held against a frozen garden pond to melt a hole in the ice, rather than smashing it
A pan of hot water melts a hole. Never smash the ice, since the shockwave harms what's sheltering below.

Leave a pile of logs or leaves in a quiet corner. Something will sleep in it, and you want it in your garden.

The Scottish picture this month

Deepest winter: cold, dark and often frozen or waterlogged. Almost nothing grows outdoors, and it is the season for planning and maintenance rather than sowing.

Frost: Hard frosts across the whole country. The heart of the dormant season.

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