Clear, tidy and plant garlic. The growing year winds down.

The month ahead

October is when the growing year winds down across most of Scotland. High ground has usually had its first frost already, lowland gardens typically see theirs by late October, and only the mildest coasts and Islands stay frost-free into November. The focus shifts from growing to clearing, storing, and planting for next year. It is the month garlic goes in, and the start of the bare-root fruit season.

Plant garlic cloves in free-draining ground, pointed end up, about 2.5cm deep so the tip sits just below the surface, and 15cm apart. Allium leaf miner lays its autumn eggs now where it's present, so if it has hit your leeks or onions before, cover the new rows with fine mesh straight away.

A row of garlic cloves freshly planted pointed end up in soil, with a hand pressing the last one into place
Pointed end up, 15cm apart along the row.

Garlic wants the cold of winter to trigger bulb formation, and an October planting gives it the longest possible season. On sheltered, well-drained ground, autumn broad beans can go in now for the earliest crop; on colder or wetter ground, wait and sow in spring. Lift and store the last root crops, or leave hardy roots like parsnips and leeks in the ground; they will stand through winter.

What to do in October

Sow indoors

Under cover: windowsill, heated propagator or greenhouse.

Sow outdoors

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

Plant out

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

Harvest

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

Tender crops on the harvest list (tomatoes, peppers, chillies, aubergines, cucumbers, sweetcorn and basil) are only still cropping under cover by now: outdoors, the first frost finishes them.

Fruit

Bare-root fruit goes in once the plants are dormant. Blackcurrants can go in from late October, gooseberries are best planted in late autumn, and raspberry canes from November. Order now so they arrive when the ground is ready; container-grown fruit can be planted any time the soil isn't waterlogged or frozen.

Key jobs in October

  • Plant garlic cloves, and autumn broad beans on sheltered, well-drained ground.
  • Lift and store the last root crops, or leave hardy roots (parsnips, leeks) in the ground.
  • Clear spent crops: compost healthy material, bin blighted or diseased foliage.
  • Plant bare-root blackcurrants and gooseberries once dormant; raspberries from November.
  • Net overwintering brassicas against pigeons and check pots for vine-weevil grubs.
  • Spread compost or well-rotted manure over empty beds as a mulch; no digging needed.
  • Insulate the greenhouse and check heaters; ventilate on milder days to deter grey mould.
  • Lift dahlia tubers after the first frost blackens them; dry and store in frost-free place.
  • Clean out water butts and gutters before winter. Debris blocks flow.
  • Wash and store canes, stakes and supports so they are ready for spring.

Three more worth doing now: go through stored apples and pears and take out any fruit that's starting to rot, then check the ones it was touching; gather fallen leaves into a cage or bag for leaf mould; and if you sowed winter salads in late summer, get them under cover before the weather turns.

The Scottish picture this month

Wet ground and falling leaves dominate now, and soil starts holding onto moisture rather than draining it away, so heavy clay is best left alone until it firms up again.

Frost: Lowland last-of-season crops face their first-frost band late October, with the mildest coastal and Island gardens holding out longest of all.

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.

Allium leaf minerUK timing · may differ in Scotland

Two egg-laying periods on alliums: March–April and late summer–autumn. Covering leeks, onions and garlic with fine mesh over those windows is the main defence.

UK timing, and conditional: the pest may not be established across all of Scotland, and where it is, local generation timing is not separately verified. Treat these as a UK guide, not a Scottish forecast.

Leek mothUK timing · may differ in Scotland

Two UK generations: May–June and a more numerous August–October flight. Mesh over alliums is again the practical control.

UK timing, and conditional in the same way as allium leaf miner; presence in Scotland is uncertain and local timing is unverified.

Mint rustbroad seasonal window

Symptoms can appear from spring until autumn. Cut affected mint to the ground and never propagate from infected plants.

Timing is broad, close to "the whole growing season", so treat it as a standing watch rather than a monthly alert.

These problems follow the weather rather than the calendar, so here is what sets each one off:

Grey mould (botrytis)

Watch when: cool, damp, still air, especially under cover

Can occur year-round with latent infections; ventilation and airflow are the real controls. Peaks when growth is soft and air is stagnant.

Slugs & snails

Watch when: mild, wet, damp conditions, worst around soft young growth

Activity tracks moisture and temperature, so risk climbs in any mild damp spell. Pressure is highest on tender seedlings in spring and again in a wet autumn.

Leek rust

Watch when: warm, wet summers with poor airflow

A wet-summer disease that is genuinely more of a Scottish problem than the allium insects. Space alliums generously; driven by leaf wetness, not a date.

Sources
  • RHS: grow-your-own guides: sowing, planting and harvest timing for all 87 crops (each window hand-derived from the crop's own RHS prose)
  • GrowScotland: pest activity framing: which pests to flag each month, and how weather-driven diseases are framed by trigger conditions rather than a fixed date