Seed Swaps


Allium ampeloprasum var. porrum

Leek is part of the Allium genus. Its scientific name is Allium ampeloprasum var. porrum.

Leek is part on the onion family and has a mild flavour. Blanch the stems to produce more white stem, but green leaves are also used
It flowers with a purple ‘allium’ type bloom in the second year

Blooms appear in these approximate colours:   Palatinate purple and   Lavender purple. When mature, blooms are roughly 6.0 cm (that's 2.34 inches in imperial) in diameter. The mature flowers are of a pompon form. When ripe, fruit appear in these approximate colours:   Black. Leaves appear approximately as a   Bottle green and   Green-yellow

It is a flowering edible vegetable and is treated mainly as a biennial, so it grows best over the course of two years.

Leek normally grows with a erect habit to a mature height of 50.0 cm (that's 1.62 feet imperial). This plant tends to bloom in early summer, followed by first harvests in late summer.

If you would like to attract bees to your garden, consider growing this plant.

Giant Musselburgh, American Flag, King Richard, Primor and Lyon Prizetaker are some of the most popular varieties of Leek for home gardeners to grow.

Leek is normally quite a low maintenance plant and is normally very easy to grow - great for beginner gardeners!

This plant info is provided by the myfolia gardener's wiki. All details about Leek have been kindly provided by our members.

How to grow Leek

  • Partial Sun

  • Full Sun

  • Medium

Hill up for blanching. Keep soil moist but don’t overwater. Takes some shade. Takes light freeze.

Hardiness varies depending on the variety.
A good way of blanching a leek is to cover the stem with the cardboard tube for kitchen paper or toilet roll. It does not blanch it in a professional way but it certainly stops a lot of soil getting between the leaves

Position in a partial sun / full sun location and remember to water moderately. Keep in mind when planting that Leek is thought of as very hardy, so this plant will survive though longer winters with little or no damage.

See our list of companion Plants for Leek to see which plants you should plant in close proximity to encourage growth.

Growing Leek from seed

Leek does not germinate when too much heat is applied. For best result, place your seeded container on bottom heat for 2 days and remove from heat.
In mild climates sow a row of seeds directly into the soil in the early spring, Sow thinly

Look to ensure a distance 0.39 inches (1.0 cm) between seeds when sowing - bury at a depth of at least 0.78 inches (2.0 cm) deep. Soil temperature should be kept higher than 16°C / 61°F to ensure good germination.

By our calculations*, you should look at sowing Leek about 56 days before your last frost date .

Transplanting Leek

Make hole with dibber 6 in or 15 cm deep and place plant into each hole then fill with water. DO NOT FILL HOLE WITH SOIL.

Or dig a trench about 6 in or 15 cm deep, plant young plants at the bottom and let nearby cultivation fill in the trench.

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Leek is a very hardy plant.

Harvesting Leek

Stick your dibber into the ground next to the stalk and carefully lift the leek out of the soil. Don’t pull them, they will break!

Leeks can be left in the ground over winter and and harvested gradually.
If left to the spring they will begin to flower and the seeds can be collected

Seed Saving Leek

Collect seeds from flowers in the second year.

Seed viability is four years.

How long does Leek take to grow?

These estimates for how long Leek takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Start logging and journaling your observations to participate!

Days to Germination How long does it take Leek to germinate?
11 days

Average 11 days | Min 1 days | Max 32 days (278)

Days to Transplant How long until I can plant out Leek?
+ 58 days

Average 58 days | Min 1 days | Max 148 days (111)

Days to Maturity How long until Leek is ready for harvest / bloom?
+ 186 days

Average 186 days | Min 14 days | Max 286 days (109)

Total Growing Days How long does it take to grow Leek?
= 255 days

When should I plant Leek?

Our when to plant Leek estimates are relative to your last frost date.

Enter your frost dates and we'll calculate your sowing and planting dates for you!

When to sow The number of days to sow Leek before or after your last frost date.
56 days before Last Frost Date

Other names for Leek

Garden leek

Allium porrum

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