How To Grow Leeks – Which?

Apart from sowing and transplanting, leeks need very little attention, which makes them easy to grow and also provides something to eat from the garden when there is not much else to harvest.

How to grow leeks: month after month

The best types of leeks

Which? Members can sign in now to see the results as a whole and what our Best Buy stocks are. If you are not a member, participate in which? for quick access.

How we try leeks

We have selected 22 widely used varieties, including previous best buys and some that have won RHS garden value awards. In early April, we sowed each species in strip units Best Buy compost to sow seeds in the greenhouse on our test site in Capel Manor, North London. When the plants were big enough to handle, we potted them in tall pots so they could grow and harden in a sheltered place. At the end of May, we planted each species in a 2 meter row with a space of 15 cm between plants and 30 cm between rows. The whole experiment was covered with tunnels of Enviromesh mesh to protect the crop Allium Leaf Miner and LeekWe harvest half of the leeks in November and the rest in another harvest in February the following year. All leeks were weighed and evaluated for quality. At the trial, we held the weeds in our hands and made sure that the crop was watered when needed.

When to sow

Leeks grow slowly and take up space in the soil most of the year. About 20 adult leek species fit on one square meter. Sow in April, either in containers with several seeds in each unit or in a seed tray. If you are sowing in a seedling bowl, use a to stick the seedlings in individual pots when they are large enough to handle Best Buy compost for growing young plantsLeeks sown in module trays and grown in lumps do not have long white roots, but any leek can be used for eating.

Take care of your plants


Once you have sown in units, plant the whole lump with a spatula or snack. After sowing in a bowl and pruning individual plants, use dibber to make a hole about six inches deep. Release the plant and make sure the top protrudes. Then fill the hole with water.

Leave about 30 cm between rows to facilitate weeding and place plants every 6 cm for full-sized leeks. When space is tight, plant closer together and take turns harvesting plants like leeks to allow the rest to mature.

Protect from pests

Leeks need little attention during the growing season. Keep the property weeded and well watered during dry times. Cover with insecticide to prevent this Allium Leaf Miner and Leek

How and when to harvest

Harvest in: October to February

Purla can be harvested from autumn to late winter. For a flower bulb that is planted separately: insert a fork into the ground next to the leek and carefully rescue it from the ground. For bulbs planted in lumps, use a spatula to cut the lump and remove individual leeks as needed.

Common growth problems


The leeks from the leeks cause light brown spots on the leaves when given. Destroy any maggots or pupae you come across. Undamaged parts of leeks can still be used. To avoid this, cover the leeks with a fine net when planting.

Read more about leek crumbs.

Allium Leaf Miner

Allium Leaf Miners go through leaves and stems in spring and autumn and you can find their brown, barrel-shaped pupae when you pull the leaves back in autumn and winter. To avoid this, cover the leeks with a fine net when planting.

Read more about Allium Leaf Miners.

Leek rust

Chives are a fungal disease that causes rust-orange spots on the leaves. It is common in hot, humid weather. Serious infections can make the leeks inedible. However, this is rare and mild infections only affect the outer leaves, which can peel off and usually disappear when the temperature drops in winter. There are no chemical controls. So your best defense is to discard any affected leaves, make sure the plants are not too numerous to improve airflow and grow your bulbs (or garlic) elsewhere each year.

Read more about leek red.


This is the time when the bulb forms a flower tip before the bulb is ready for harvest. It is usually caused by the weather, often with late and cold spring to blame. Extremely hot conditions can also lead to coaching. It can help to improve the soil so that it does not dry out. Grow all affected plants and use what you can use immediately