Growing Shallots in Scotland: The Complete Guide

Allium cepa (Aggregatum Group)

Shallots are a low-effort allium that rewards a dry summer and a well-drained bed with clusters of bulbs that store for months.

They're forgiving once they're in the ground, but two decisions early on matter most here: growing from sets rather than seed, since sets are quicker and better suited to cold regions, and choosing spring planting over autumn unless your soil is free-drainingSoil that lets water pass through quickly rather than pooling, so roots aren't sitting in wet ground after rain. Full definition →. Get those two right and the rest is straightforward: water sparingly, weed carefully, and lift a cluster of bulbs in mid to late summer.

Choosing sets or seed

Grow from sets rather than seed for almost any Scottish garden. Sets are quicker to grow and better suited to cold regions, which is a direct fit for a short growing season. Seed is cheaper and less prone to bolting, but noticeably slower, which works against you here. Where bolting has been a repeat problem, heat-treated sets or a bolt-resistantA plant switching early into flowering and seed production, usually triggered by stress, after which leaves, roots or bulbs turn bitter or unusable. Full page → variety such as Zebrune are the better fix than switching to seed.

Preparing the ground and planting

Choose a sunny site with fertile, well-drained soil, and work in a bucketful of well-rotted manure or garden compost per square metre. Utah State University Extension gives a soil pH of 5.5 to 7.5, a wide range. Avoid damp ground: use raised beds or containers if drainage is poor, and note that a wet bed also rules out autumn planting.

Plant sets in early to mid-spring, the reliable default, with the tip just showing at the surface, spacing them 15-20cm apart in rows 25-30cm apart. Some varieties tolerate autumn or winter planting instead, and it can give an earlier, heavier crop, but only on free-draining soil. On anything heavier, bulbs may rot, so spring planting is the safer choice. Firm the soil and water in after planting, and check newly planted sets for a few days: birds will peck them straight out of the ground before they've rooted, so cover with fleeceA lightweight, breathable fabric laid or draped over plants to trap a little warmth and keep off frost, wind and some flying pests. Full definition → or netting if that's been a problem before.

Rotation and white rot

Shallots share their pests and diseases with onions, garlic and leeks, so keep them together in your rotation plan rather than as separate crops. White rot is the exception to what rotation can fix: it causes yellowing, wilting and decay of roots and bulbs, its sclerotia can stay in the soil for at least 15 years, and no chemical treatment is available to gardeners. The defence is not to bring it onto clean ground on plants, tools or soil.

Varieties

'Matador' (rounded reddish-brown bulbs, high yield, stores well) and 'Meloine' (rounded, mild flavour, resists downy mildew) also hold the AGMThe RHS's Award of Garden Merit: a UK-wide trials award for reliable performance, not a Scotland-specific recommendation. Full definition →, and 'Camelot' (teardrop-shaped, reddish skin, stores well) does not. The award is UK-wide, not a Scottish one.

Also worth considering

Best Shallot Varieties for Scotland → compares all named shallot varieties head-to-head, with the practical detail that doesn't fit in a summary card.

Watering, feeding and weeding

Water only during prolonged dry spells, and stop altogether once the bulbs start to swell in high summer: watering this late doesn't help the crop and reduces how well it stores. Container-grown shallots need more frequent watering than anything in the ground. If your soil is poor, feed autumn-planted sets with a nitrogen-rich organic fertiliser in late winter to give them a spring boost.

Weed regularly, since shallot foliage casts little shade and does nothing to smother competition on its own. Hand-weed close to the bulbs rather than hoeing: the roots sit shallow and a hoe close to the plant risks damaging them.

Bolting

Low spring temperatures trigger bolting, and a bolted plant won't store well even if you still get a crop from it. Remove flower stems the moment you see them, and use any bulb that's already flowered straightaway rather than trying to store it.

Harvesting

Lift shallots in mid to late summer, once the foliage yellows and flops over: roughly 20 weeks from a spring planting, longer from an autumn one. Use a hand fork to lever bulb clusters gently out of the ground rather than pulling them, since bruising a bulb is what causes it to rot in storage. Separate each cluster into individual bulbs once lifted.

Storing

Dry the bulbs fully before storing: lay them out in a single layer on wire racks or slatted trays outdoors in full sun for about two weeks, or under cover somewhere well-ventilated if the weather is damp. Where to store them afterwards is disputed: somewhere light, cool, dry and well ventilated, with darkness said to encourage sprouting (RHS), or a cool, dark, dry place (Gardener's World). Cool and dry matter in both, so treat those as the non-negotiables. Stored well, undamaged bulbs keep for at least six to eight months.

Storing Onions, Garlic and Shallots → sets out curing times and storage life for all three crops together.

Common problems

• Slugs and snails are a risk, particularly to seedlings from a seed-raised crop.
• Bolting is triggered by a cold spring. Remove flower stems immediately, and use heat-treated sets or a bolt-resistant variety such as Zebrune if it keeps happening.
• Birds peck newly planted sets straight out of the ground before they've rooted. Cover with fleece or netting until established.

Common questions

Sources