What can I sow in March in Scotland?

Tomatoes, Leeks, Kale, Peas, Onions, Broccoli, Cabbage, Brussels Sprouts and more. 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 March in Scotland?

Last spring frost is still to come everywhere: mid-to-late April at the earliest on mild coasts, later inland and at altitude. Frost varies sharply over short distances, so treat these as regional averages, not garden predictions.

March in the Scottish Garden

🌱 Spring📅 RHS timing, Scotland-adjusted🌡️ Met Office frost bands

Sowing gathers pace under cover; the first hardy crops go outdoors.

The month ahead

March is when the Scottish growing year stirs into life ; but it is not yet spring in any reliable sense. Frost is still a weekly event across most of the country, and the soil is cold. The key this month is to keep the tender crops indoors and get the hardy ones into the ground as soon as conditions allow. Every week you gain now is a week of harvest you get back in autumn.

Sow tomatoes, peppers, chillies and aubergines indoors with warmth and as much light as you can give them. Make the first outdoor sowings of truly hardy crops: broad beans, early peas, and parsnips. Wait until the soil is workable ; not frozen, not waterlogged. If it sticks to your boots, wait another week.

What to do in March

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).

Fruit & ornamentals

Prune bush and climbing roses now ; this is your last chance before growth starts. Cut to an outward-facing bud and remove any dead, diseased or crossing stems. Start dahlia tubers into growth in pots of damp compost indoors. Lift and divide overgrown clumps of summer-flowering perennials. If a clump has gone woody in the centre, split it, discard the middle, and replant the vigorous outer pieces.

A dug-up perennial plant clump being split by hand into smaller pieces, with the old woody centre set aside — Split a woody clump, discard the middle, and replant the vigorous outer pieces.

Under cover

Cover prepared beds with fleece or cloches to bring the soil temperature up. The difference between a covered bed and an uncovered one in March can be 3-5 degrees. Keep young seedlings out of cold draughts and water sparingly. Damping off is the biggest indoor killer this month: it thrives in cold, still, damp conditions.

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Key jobs in March

Sow tomatoes, peppers and other tender crops indoors with warmth.
Make the first outdoor sowings of hardy crops: broad beans, early peas, parsnips.
Plant early potatoes where soil is workable, later at altitude.
Plant onion sets and shallots.
Prune bush and climbing roses; this is your last chance before growth starts.
Start dahlia tubers into growth in pots of damp compost indoors.
Lift and divide overgrown clumps of summer-flowering perennials.
Cover prepared beds with fleece or cloches to bring soil temperature up.
Mow the lawn on dry days with the blades set high for the first cut.
Keep young seedlings out of cold draughts and water sparingly to avoid damping off.

The Scottish picture this month

The season stirs, but frost is far from over. Soil is slowly warming and drying. In the mildest coastal lowlands the last frost can be weeks away; inland and upland it is still well ahead.

Frost: Last spring frost is still to come everywhere: mid-to-late April at the earliest on mild coasts, later inland and at altitude.

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

Watch out for

Damping off

Seedlings started under cover in cold, low light are prone to collapsing at the base. It is tied to early-spring propagation, exactly when Scottish growers start sowing indoors.

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.

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:

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.

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