March is the month when hesitant gardeners feel the pull. This is a list of vegetables that genuinely don’t require skill, a greenhouse, or anything fancy — just a seed tray, a windowsill, and a bit of patience. These are the crops I’d hand to a first-time grower and guarantee satisfaction with.
When I started growing fifteen-plus years ago — long before I took on my East Sussex allotment — I began with exactly this list: radishes, broad beans, salad leaves, and a couple of cherry tomatoes on the kitchen windowsill. Every single one of those succeeded. The confidence that comes from a first successful harvest is real, and these crops are designed to give it to you quickly.
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On the windowsill
Cherry tomatoes: More forgiving than beefsteaks. Sow on a warm, bright south-facing windowsill and they’ll germinate without a heated propagator (though it helps). Keep the compost moist and expect sprouts in 1–2 weeks. Gardener’s Delight is the variety I’d recommend first — reliably productive, good flavour, and tolerant of the variable British summer.
Browse seeds at Thompson & Morgan
Thompson & Morgan have strong spring collections for vegetable growers and flower borders — their seed range covers everything from courgettes to sweetcorn if you haven’t ordered yet. (Affiliate link — we may earn a small commission at no extra cost to you.)
Lettuce — cut-and-come-again varieties: Sow lettuce directly in a shallow tray on any windowsill. Room temperature is fine — it doesn’t need warmth. You can start picking outer leaves in 4–5 weeks. A 20cm pot is enough for several pickings a week through spring.
Spring onions: Broadcast seeds across a pot of compost. Incredibly forgiving — they’ll grow steadily through spring on almost any windowsill that gets a reasonable amount of light.
Chillies (sunny windowsill only): Chillies need warmth and at least 4–5 hours of direct sun. If your windowsill gets that, start them in March and they’ll produce well by late summer. If not, they’ll go leggy and struggle — stick to the other crops on this list instead. I’ve grown chillies from a south-facing kitchen windowsill for many seasons with consistently good results.
Directly in the ground
Broad beans: Push a seed 5cm into the soil and it will do the rest. Genuinely difficult to fail with. Space them 20cm apart and leave them alone until harvesting in June. On exposed or windy plots, sow in modules first for sturdier plants — but on a sheltered site, direct sowing is fine from mid-March.
Peas — mange tout for small spaces: Sow 2–3cm deep. They’ll climb and crop prolifically. Mange tout varieties are compact, don’t need shelling, and are ready to pick almost continuously once they start.
Spinach: Direct sow in March — it germinates readily in cool soil and is harvestable in 6–8 weeks. Pick outer leaves to keep the plant producing.
Radishes: The easiest crop in the garden. Sow 1–2cm deep, harvest in 4 weeks. The speed alone is confidence-building. Sow a short row every two weeks from March to August for a continuous supply.
In pots outside
Mixed salad leaves: Scatter seed across pots of compost. Place on the patio from mid-March and start cutting in 5–6 weeks. Re-sow every few weeks for continuous harvests. A 30cm pot produces more salad than most households can eat weekly through spring.
Kale: Sow in a pot and it establishes into a sturdy plant that produces from spring through to winter. One of the hardiest crops you can grow — it usually comes through a UK frost without any protection at all.
One piece of kit worth having
A seed tray propagator set with a clear lid transforms windowsill sowing. The lid maintains humidity and creates a mini-greenhouse, which speeds germination noticeably and stops the compost drying out between waterings. It’s a modest investment — around £10–15 for a good basic set — and lasts for years.
What’s the easiest vegetable to grow from seed in March?
Radishes and lettuce are both near-failsafe. Neither requires anything fancy — sow direct, water occasionally, harvest within 4–6 weeks. If you’ve never grown anything before, start with radishes for the quickest reward.
Do I need a greenhouse to sow in March?
Not at all. A warm windowsill is enough for tomatoes, chillies, lettuce and spring onions. Hardy crops like broad beans and peas don’t need protection — they go straight in the ground.
The beginner’s March shortlist
Radishes in the ground, cherry tomatoes on the windowsill, broad beans in modules, and a pot of salad on the patio. Four things, a couple of hours, and you’ll have your first harvests within the month. Everything after that is confidence built on experience.
📋 From the D&L Shop: Planning your growing year? Our Your First Year on the Allotment guide covers every month from clearing the plot to your first proper harvest — written from 15+ years of UK growing experience. £9.99, instant PDF download. Also useful: the Allotment Plot Planner (£4.99) for mapping beds and planning crop rotation. Browse the full shop →
🛡 Our standards: How we research · Editorial policy · Affiliate disclosure · Corrections · Last reviewed: April 2026
About Gareth
Gareth Isherwood is the editor of Danbury & Lovejoy. He has baked bread at home for 25+ years and has 15 years of growing experience across gardens, containers and other growing spaces, including an East Sussex allotment for the past three years. Read his full story →
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