Thompson & Morgan

Important delivery notice
The products on this site are only delivered to UK addresses. If you require delivery to another country please visit one of our other sites below.

Refine Results

Refine by..

Email Newsletter

Sign up to our newsletter

Onion & Leek Seeds


Growing onions from seed is easier than you think and can be cheaper than buying onion sets. You'll find all different types of onion in our range - spring, white, red, brown and shallots. Our range of leeks offers outstanding garden and exhibition varieties.

We have found 48 products.
 
Leek 'Pennine' F1 Hybrid

Leek 'Pennine' F1 Hybrid

Allium porrum
  • NEW in 2013
From British breeding comes the first - and only - hybrid pot leek. The result of painstaking work in crossing sterile male lines with top prize-winning show leeks. Leek ‘Pennine’ is a much thicker, but shorter blanch with a true pot leek appearance. This autumn variety is ideally grown in individual 25cm (10") pots or in well-prepared soil in the garden, where it will withstand adverse conditions right up until New Year. Height: 45cm (18"). Spread: 30cm (12"). More info
    • 1 packet (40 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.99
Onion : Bunching/Spring : Eiffel

Spring Onion 'Eiffel'

Allium cepa, Bunching Onion, Scallion

 An improved White Lisbon, Spring Onion Eiffel has upright leaves for successional sowings for spring, summer and autumn production. Spring Onion Eiffel is slow to form bulbs during the long days of summer, with improved disease tolerance. More info
    • 1 packet (500 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.19
Onion : Ciboule

Onion 'Ciboule' (Bunching Onion) - Heritage

Allium fistulosum, Welsh Onion, Spring Onion, Scallion

Onion ‘Ciboule’ is perennial bunching onion usually grown as an annual, but fully winter hardy. This heritage variety forms dense clumps of slender hollow stems that can be used as a substitute to chives. The slender elongated bulbs are similar to spring onions with a strong flavour and make a tasty addition to salads. Height: 30cm (12"). Spread: 23cm (9").


Culinary note: Some parts of these flowers are edible. For more details about edible flowers click here.

 More info
    • 1 packet (300 seeds)

    • Despatch: Within 2 Days
    •  
    • £1.99
Onion : Rosanna

Onion 'Rosanna'

Allium cepa

  Customer Rating

A distinctive and appealing reddish brown skinned, semi-globe shaped bulb with stunning pink rings when sliced. Onion ‘Rosanna’ is ideal for all culinary uses with a real old fashioned flavour, similar to those purchased from the French onion seller of yesteryear. Height: 45cm (18"). Spread: 15cm (6").

 More info
    • 1 packet (350 seeds)

    • Despatch: Within 2 Days
    •  
    • £1.99
Onion Cevenne

Onion 'Doux des Cevennes'

Allium cepa

 Originating from the steep terraced hillsides of the Cevennes mountain range, heritage variety Onion ‘Doux des Cevennes’ is highly prized throughout France. With a mild, delicate flavour, and a thin pearly skin, the soft pale flesh has a delicate flavour when eaten raw and becomes more savoury when cooked. This sweet onion is perfect for making delicious onion tarts. Height: 45cm (18”). Spread: 15cm (6”). More info
    • 1 packet (200 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.19
Onion : Bunching/Spring : Summer Isle

Onion 'Summer Isle' (Bunching Onion)

Allium fistulosum, Oriental Bunching Onion, Spring Onion, Scallion

This superb RHS AGM Oriental bunching onion has been bred for its sweet and mild flavour. Use this non-bulbing, perennial onion as a spring onion to add to salads or chopped as a chive-like garnish with a mild flavour. Winter hardy Onion ‘Summer Isle’ can be harvested virtually year round from successional sowings. Height: 30cm (12”). Spread: 23cm (9”).


Culinary note: Some parts of these flowers are edible. For more details about edible flowers click here.

 More info
    • 1 packet (500 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.19
Leek : King Richard

Leek 'Kong Richard'

Allium porum, Leek 'King Richard'
A particularly early cropping variety that can be lifted by July from the very earliest sowings, but will easily stand until Christmas from a later sowing. The long, slender stems of Leek ‘Kong Richard’ are full flavoured and ideal for slicing. This RHS AGM variety can also be grown close together for delicious, succulent mini leeks, but is best harvested by Christmas as it is less hardy than some other varieties. Height: 45cm (18”). Spread: 30cm (12”). More info
    • 1 packet (125 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.49
Onion : Supasweet™ (Dulcinea) F1 Hybrid

Onion 'Supasweet'™ (Dulcinea) F1 Hybrid

Allium cepa

The first commercial variety of sweet and mild bulb onions available to UK gardeners! The large semi-globe, copper-skinned bulbs of Onion Supasweet™ are so sweet and juicy they can be eaten raw without being overpowering - ideal for adding to summer salads. Bulbs are best used as required, as they are not renowned for their storage capabilities.

Please note: Onion flavour (its sweetness and mildness) is significantly affected by weather conditions, soil type and its sulphur content. Light, sandy soils produce the highest levels of sweetness, whereas clay and dark humus rich soils can result in bulbs with a stronger flavour. Height: 45cm (18"). Spread: 10cm (4").

 More info
    • 1 packet (200 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.29
Leek Cairngorm F1

Leek 'Cairngorm' F1 Hybrid

Allium porrum

 The first F1 leek from seed, produced by British breeding from specially selected top prize-winning show leeks! This stocky variety has superb vigour and uniformity making it ideal for growing individually as a pot leek. Early autumn maturity makes Leek ‘Cairngorm’ ideal for the show bench as well as outside in the vegetable plot, where stems will stand until after Christmas. Height: 45cm (18”). Spread: 30cm (12”). More info
    • 1 packet (40 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.99
Kew Urban Garden Vegetables : Onion : Bunching/Spring : Pompeii

Spring Onion 'Pompeii'

Allium cepa

 Allium cepa. A quick growing, silver skinned cocktail/pickling onion. Spring Onion Pompeii is succulent and ideal for sowing thinly in containers or window boxes. More info
    • 1 packet (300 seeds)

    • Despatch: Within 2 Days
    •  
    • £1.99
Spring Onion 'Sentry'

Spring Onion 'Sentry' - SowStrong® Collection

Allium cepa
  • NEW & EXCLUSIVE in 2013
This upright, dark stemmed spring onion is ideal for sowing closely for high yields of delicious, full flavoured stems. When sown every 4 weeks, Spring onion ‘Sentry’ will provide good yields throughout summer. Absolutely delicious in sandwiches and salads. Height: 30cm (12"). Spread: 5cm (2").
Culinary note: Some parts of these flowers are edible. For more details about edible flowers click here.

Useful links:

Read more on our blog: SowStrong® – A Natural Way to Growing Success

 More info
    • 1 packet (250 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.49
Onion Cipolla Rossa di Toscana - Vita Sementi Italian Seeds

Onion 'Rossa di Toscana' - Vita Sementi® Italian Seeds

Allium cepa

 A red onion with a powerful flavour. Onion ‘Rossa di Toscana’ produces glossy, red skinned bulbs with attractive dark red tinged flesh. This colourful Italian onion is ideal for storing for autumn and winter use. Height: 45cm (18"). Spread: 10cm (4"). More info
    • 1 packet (840 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.69