How to Grow Leeks

Leeks are a fantastic green and nutritious vegetable to grow for harvests in the winter, when there’s not a huge amount growing in the garden and harvests aren’t at their greatest. Leeks are so flavoursome in soups and added to mushrooms and bacon in tomato sauces. The whites and the green of leeks taste slightly different too so pack a two-taste punch to winter meals.

Sowing Leeks
Germination time = 2 to 2 ½ weeks

You can sow leek seeds directly in the ground from Mid-March to mid-April for a winter harvest. Or you can sow in June for spring harvests the following year. Depends on when you want this great vegetable for the kitchen table. On the other end of the scale. Sow in early March for an autumn harvest. The weather in March varies greatly from year to year, and it’s the more clement ones that this earlier sowing suits. You can sow under glass in late winter for transplanting in mid-April for an autumn to early winter harvest.
Sow thinly in drills (shallow furrows made with the edge of a hoe) outdoors and thin out gradually until the remaining seedlings are about 5cm apart. If sowing under glass, add two to three seeds to a small pot, and remove the two weaker seedlings once the seedling show around four leaves.

Planting Leeks
Transplant young plants into the ground in June. They should be about 20cm in length and about the thickness of a pencil. For their eventual planting hole use a dibber to create a long thin hole 15cm deep. Drop the young plants in the holes and fill the holes with water. You don’t need to fill the soil with soil as the leeks ‘girth-out’ quickly to fill them.

For plants already grown we recommend you unpack and examine them upon receipt. If they have dried out during transit they will benefit from a gentle watering. Plant out as soon as possible when conditions allow in a sunny spot where available. Prepare the soil well before planting, incorporate a good quality compost and water well. Prepare holes 4-6in (10-15cm) deep with a dibber and set the plants gently with out firming them in. Fill the hole with water, this will consolidate the plants sufficiently. Ensure the soil bed is well watered throughout the season and weed well.

How to Care for Leeks

Feeding Leeks
It pays to prepare the soil well before sowing leeks or adding young plants. In the winter add lots of bulky compost or manure to the soil to increase the nutrient levels. To top up and really put the young plants in good stead, add a general purpose fertiliser a couple of weeks before sowing or planting. To increase the thickness of stems feed regularly until mid-summer. If you prefer leek-whites to leek-greens earth soil up gently while they are growing, making sure you don’t get soil in between the leaves.

Watering Leeks
Water seed beds after sowing or containers if growing early crops indoors. When transplanting leeks into their final hole, fill the hole with water as this settles and firms the roots, while they thicken to fill the hole. Water leeks during dry weather. They are quite self-sufficient when they are not competing for water with surrounding weeds – so keep these to a minimum – or not exposed to long periods of dry weather.

Leeks appreciate a sunny spot so bear this in mind when sowing or planting.

Harvesting and Storing Leeks
For early harvests from seeds sown indoors in winter, harvest in autumn lifting leeks from the soil gently. For seeds sown in the main season of spring, harvest throughout winter, and for those summer sowings, you can expect to lift leeks in spring the following year. Leeks will store for up to a week in the fridge. By sowing over a period of time though through the spring you can have crops all though winter and into spring the following year.

Best Varieties of Leek - Krypton, ApolloMusselburgh

Pests and Diseases of Leeks - Generally trouble-free other than leek moth