🌱✗ Tested and false“Leeks take forever — they're in the ground for over a year”
The time from sowing to harvest varies enormously by variety. Early varieties sown in spring can be ready by late summer, about five months. Maincrop types stand through winter into spring, nine or ten months. A March sowing gives a September to April harvest window.
What to do: Choose early varieties for a quick crop and maincrop types to stand through winter. Sow in modules in March rather than direct, which shaves weeks off the establishment time.
In Scotland: Leeks are one of the most reliable Scottish winter vegetables and the long standing time is a benefit here, not a cost. A March-sown leek gives you something green for six months when almost nothing else is producing.
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- RHSSow March; harvest September to April depending on variety
“Thin leeks mean you planted them too close together”
Spacing matters, but the main cause of thin leeks is starvation rather than crowding. Feeding leeks with a nitrogen-rich fertiliser in summer is the advice — poor crops result more from insufficient feeding than from spacing.
What to do: Give leeks rich soil and a nitrogen feed in midsummer. Spacing at 15cm with 30cm between rows is standard; going wider does not compensate for poor feeding.
In Scotland: A wet Scottish summer leaches nitrogen faster, so the feeding point bites harder here. A granular fertiliser applied before rain is worth more than liquid feed washed straight through.
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- RHSFeed with a nitrogen-rich fertiliser in summer for a better crop
“You should sow leeks on Christmas Day for the biggest plants”
The Christmas Day tradition is a calendar marker rather than a rule. The advice is to sow leeks indoors from late winter to early spring. Sowing too early in the depths of winter produces leggy seedlings with no real advantage over a February sowing.
What to do: Sow leeks in modules indoors in February or March for the best balance of early growth and manageable seedlings. A March sowing in a cold frame or unheated greenhouse catches up with a December sowing within a few weeks.
In Scotland: The Christmas Day rule makes even less sense here. Low light levels in December and January mean a Boxing Day sowing will sit barely growing for six weeks, while a March sowing powers away from the start.
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- RHSSow indoors from late winter to early spring
“Earth leeks up like potatoes to get a longer white shank”
Earthing up does blanch the stem, but there is a trade. Soil can get between the leaves and is difficult to remove when cleaning. The alternative is to plant into a dibbed hole and let the soil naturally fall in as the plant grows.
What to do: Drop leek seedlings into a hole made with a dibber about 15cm deep, water them in without backfilling, and let the soil collapse in gradually. This blanches the stem without grit between the leaves.
In Scotland: Wet Scottish soil means grit and mud are harder to wash out of earthed leeks. The dibber method avoids the problem entirely and suits our climate.
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- RHSDrawing soil up blanches stems but soil can lodge between leaves; dibbing is the alternative
“Leeks can sit in the ground all winter — just lift them when you need them”
Leeks genuinely are one of the most resilient standing crops, harvestable from autumn right through to spring. They do not go woody like parsnips or split like carrots, and they stand through frost, snow, and wet without complaint.
What to do: Leave leeks in the ground and lift as needed. Lift using a fork rather than pulling, as the stems snap easily. The last leeks should come out by March before they start to run to seed.
In Scotland: This is one of the strongest reasons to grow leeks in Scotland. A row of leeks standing through a wet, cold winter is fresh food when almost nothing else is harvestable.
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- RHSHarvest from autumn through to spring; leeks stand well in the ground through winter
