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. Frost is now widespread inland, 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 best month to plant bare-root fruit, and it is the month garlic goes in.
Plant garlic cloves in free-draining ground, pointed end up, about 5cm deep and 15cm apart.
Garlic wants the cold of winter to trigger bulb formation, and an October planting gives it the longest possible season. Plant autumn-planting broad beans now for the earliest crop next 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).
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
Plant bare-root fruit now, while dormant: raspberries, blackcurrants and gooseberries all establish best from an autumn planting. The soil is still warm enough for roots to grow, and the plants will be settled and ready to grow away in spring. Lift dahlia tubers after the first frost blackens the foliage, dry them upside down for a few weeks, then store in barely-damp compost in a frost-free place. Label them ; you will not remember which is which by March.
Key jobs in October
- Plant garlic cloves and autumn-planting broad beans.
- 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 fruit: raspberries, blackcurrants, gooseberries; dormant planting is best.
- Net overwintering brassicas against pigeons and check pots for vine-weevil grubs.
- Dig over empty beds and work in compost or manure while the soil is still workable.
- 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.
The Scottish picture this month
Firmly autumn. Frost is now widespread inland and returning to the lowlands; the mildest coasts and Islands hold on longest. Wet ground and falling leaves dominate.
Frost: Lowland last-of-season crops face their first-frost band late October; only the mildest coasts and Islands stay frost-free into November.
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 minerRHS UK timing · uncertain 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, Scottish generations have consistently lagged the UK ones. Treat these as a UK guide, not a Scottish forecast.
Leek mothRHS UK timing · uncertain 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 track the weather, not the calendar. Their month-by-month activity isn't sourced, so we tie them to the conditions that trigger them rather than pretend a date:
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 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