3 Tubers for £10.75 - Less than £3.59 Each (SAVE 20%)

Click here to view our range of Dahlias.

Sorry this item is currently unavailable due to a stock shortage

Please see our recommended alternative variety in the description below.

3 packs for £11.97 Save £6 (9 tubers)

3 packs for £11.97 Save £6 (12 tubers)

3 packs for £11.97 Save £6 (60 corms)

3 packs for £11.97 Save £6 (30 corms)

SAVE 20% PLUS Buy 3 packs & save £6.00 (45 corms)

Click here to view our range of Gladioli.

3 packs for £11.97 Save £6 (3 tubers)

3 packs for £11.97 Save £6 (9 rhizomes)

3 packs for £16.02 Save £8.01 (30 corms)

SAVE 20% PLUS Buy 3 packs & save £8.01 (45 corms)

Click here to view our range of Gladioli.

2 packs for £32.98 Save £7 (150 Corms)

Click here to view our range of Gladioli.

2 packs for £32.98 Save £7 (40 Corms)

Click here to view our range of Summer Bulbs.

2 packs for £32.98 Save £7 (24 Corms)

Click here to view our range of Summer Bulbs.

2 packs for £31.98 Save £8 (120 Corms)

Click here to view our range of Summer Bulbs.

2 packs for £32.98 Save £7 (60 Corms)

Click here to view our range of Summer Bulbs.

2 packs for £19.96 Save £10 (40 Bare Roots)

Click here to view our range of Summer Bulbs.

2 packs for £29.98 Save £10 (10 Bulbs)

Click here to view our range of Dahlias.

3 packs for £9.96 Save £5.01 (30 Corms)

Click here to view our range of Summer Bulbs.

3 packs for £9.96 Save £5.01 (9 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £9.96 Save £5.01 (30 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £9.96 Save £5.01 (3 Bulbs)

Click here to view our range of Lily Bulbs.

3 packs for £13.98 Save £6.99 (9 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (15 Tubers)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (9 Tubers)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (30 Corms)

Click here to view our range of Crocosmia Corms.

3 packs for £13.98 Save £6.99 (9 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (9 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (18 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £13.98 Save £6.99 (9 Bulbs)

Click here to view our range of Lily Bulbs.

3 packs for £17.97 Save £9 (21 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £17.97 Save £9 (15 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £19.98 Save £9.99 (15 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £19.98 Save £9.99 (9 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £19.98 Save £9.99 (3 Bulbs)

Click here to view our range of Summer Bulbs.

3 packs for £29.97 Save £15 (3 Bulbs)

Click here to view our range of Summer Bulbs.

2 packs for £34.98 Save £5 (300 Bulbs)

Click here to view our range of Summer Bulbs.

2 packs for £20.98 Save £5 (70 Bulbs)

Click here to view our range of Summer Bulbs.

3 Bottles for £28.95 save £10 (£9.65/Bottle) or 6 Bottles for £47.94 save £30 (only £7.99/Bottle). Mix and Match the offer across our range of 4 professional Marshalls Liquid Feeds.

Click here to view our range of Marshalls Feeds.

3 packs for £15 Save £5.97 (9 Plants)

Click here to view our range of Vegetable Plants.

Choose any 3 and the cheapest pack will be FREE! Save £7.99 (9 Plants)

Click here to view our range of Chilli Plants.

Choose any 4 and the cheapest pack will be FREE!

Click here to view our range of Perennial Plants.

Choose any 4 and the cheapest pack will be FREE!

Click here to view our range of Sweet Pea Plants.

Choose any 4 and the cheapest pack will be FREE!

Click here to view our range of Summer Bedding Plants.

2 packs for £14.98 Save £5 (10 Bulbs) 4 packs for £19.96 Save £20 (20 Bulbs)

Click here to view our range of Lily Bulbs.

This product is delivered by our suppliers

Add a contact number when checking out to stay up to date with your order. Click here for details.

The product is delivered by our suppliers

Add a contact number when checking out to stay up to date with your order. Click here for details.

SAVE £10 and get FREE DELIVERY!

Click here to view our range of Vegepod raised beds and accessories.

SAVE £20 and get FREE DELIVERY!

Click here to view our range of Vegepod raised beds and accessories.

SAVE £30 and get FREE DELIVERY!

Click here to view our range of Vegepod raised beds and accessories.

Choose 6 Flower Seeds and our Flower Wheel will be FREE!

Click here to view our full range of Flower Seeds.

Choose any 3 and the cheapest pack will be FREE! Save £10.99 (9 Plants)

Click here to view our range of Tomato Plants.

48-Hour Express Delivery on compost ONLY orders placed Monday to Thursday

Click here for our range of compost.

Choose any 4 and the cheapest pack will be FREE! Enter "ROSE43" at checkout.

Click here to view our full range of Bare Root Roses.

Add 2 to your basket and enter discount code "KOJO2" at checkout for your £16 discount to apply.

2 packs for £29.98 Save £10 (2 Giant Roots)

Click here to view our range of Summer Bulbs.

FREE DELIVERY on seed only orders

Click here to view all Vegetable Seeds & click here to view all Flower Seeds

Choose 3 and the cheapest pack will be FREE! Enter "BED40" at checkout.

Click here to view our full range of Summer Bedding Seedlings.

Choose any 3 and SAVE £20! Enter "CLIMB3" at checkout.

Click here to view our full range of Climbing Plants.

FREE Delivery on selected Double Bags of Compost. Applies to compost ONLY orders

Click here to view all of our Free Delivery Compost.

Buy 2 and SAVE £20! Enter "WIST20" at checkout.

Buy 2 and SAVE £10! Enter "AZA10" at checkout.

Click here to view all of our 5 Ltr Azaleas.

Choose any 3 and the cheapest pack will be FREE! Enter "AZA3" at checkout.

Click here to view all of our 1.5 Ltr Azaleas.

Save 20% on this Compost

Click here to view all of our Spring Savings.

3 bottles for £23.97 (Save £15) 6 bottles for £37.92 (Save £40)

Click here to view our range of Marshalls Feeds.

Save £5 on these Mens Gloves

Click here to view all of our Spring Savings.

Save £3 on these Ladies Gloves

Click here to view all of our Spring Savings.

Savings on Essential Spring Lawn Care

Click here to view all of our Lawn Care Savings.

Save 10% on this Raised Bed

Click here to view all of our 10% off Raised Beds.

Choose any 3 and the cheapest pack will be FREE! Enter "FRUIT3" at checkout.

Click here to view all of our 15cm Fruit Plants.

SAVE £15 with our Spring Bird Bundle

Click here to view all of our Spring Savings.

Spend £10 and SAVE 25% Enter "SEED25" at checkout.

Click here to view all Vegetable Seeds & click here to view all Flower Seeds

Choose any 3 and the cheapest pack will be FREE! Enter "GR10" at checkout.

Click here to view our full range of Garden Ready Bedding.

Spend £10 and get 50 FREE Plant Labels & Pen! Enter "SEED10" at checkout.

Click here to view all Vegetable Seeds & click here to view all Flower Seeds

SAVE up to 50% on Bedding

Click here to view all 60 Seedling Bedding Packs.

SAVE £3 on these Sweet Potato Plants

Click here to view all discounted Vegetable Plants.

SAVE £3 on this Grafted Vegetable Plants

Click here to view all discounted Vegetable Plants.

SAVE £2 on these Herb Plants

Click here to view all discounted Vegetable Plants.

SAVE 20% PLUS Buy 3 packs & save £2.72 (3 tubers)

Click here to view our range Dahlia Tubers.

SAVE 20% PLUS Buy 3 packs & save £5.01

Click here to view all Summer Bulbs.

SAVE 20% PLUS Buy 3 packs & save £6.00

Click here to view all Summer Bulbs.

FREE delivery on New Horizon peat-free compost only orders

Click here to view all New Horizon compost.

SAVE 20% PLUS Buy 3 packs & save £6.99

Click here to view all Summer Bulbs.

SAVE 20% PLUS Buy 3 packs & save £9.99

Click here to view all Summer Bulbs.

FREE delivery on select Slug Deterrents

Click here to view all slug deterrents.

Choose any 3 and the 3rd with be FREE! Enter "SALV32" at checkout.

Click here to view all of our Special Offers.

SAVE 30% on ALL Flower & Vegetable Plants, Seeds and Bulbs

Click here to view our full range of 30% Off.

FREE Delivery on VegTrug

Click here to view our full range with FREE delivery.

FREE Delivery on selected Plant Feeds

Click here to view our full range with FREE delivery.

FREE Delivery on Sun Bubbles

Click here to view our full range with FREE delivery.

FREE Delivery on selected Bags of Compost

Click here to view our full range with FREE delivery.

SAVE £9.99 on Hanging Basket Kit with any Speedy Planter! Enter "SPEED1" at checkout.

Click here to view the Hanging Basket Growing Kit.

SAVE £9.99 on this Feed with any Speedy Planter. Enter "SPEED1" at checkout.

Click here to view all of our Speedy Planters.

FREE Delivery on selected Watering Cans

Click here to view our full range with FREE delivery.

FREE Delivery on selected Christmas Seed Potatoes

Click here to view our full range with FREE delivery.

FREE Delivery on selected Summer Brassicas

Click here to view our full range with FREE delivery.

Buy 2 for £40 on Selected 5 Ltr Hydrangeas

Click here to view all Hydrangeas included.

FREE delivery on selected Pest Control

Click here to view our full range with FREE delivery.

FREE delivery on HOTBIN products

Click here to view our full range with FREE delivery.

Summer Colour SALE - 70% OFF

Click here to view everything in our sale.

Plant of the Month - Buy 2 SAVE £5

Add two to your basket and enter discount code "STARJ5" for the offer to apply.

Choose any 5 and the cheapest pack will be FREE!

Click here to view our range of Spring Bulbs.

Choose any 3 and the cheapest pack will be FREE!

Click here to view our range of 9cm plants included.

Save 10% on Selected Watering Solutions

Click here to view our full range with 10% off.

Free Plant Labels & Pen when you spend over £10 on Seeds

Click here to view all included Flower and Vegetable Seeds.

Free when you spend over £10 on Seeds

Click here to view all included Flower and Vegetable Seeds.

Onion Seeds - Showmaster

Marshalls

£1.99

Catalogue Code: 1020-2378

RHS Award of Garden Merit

In stock

Grow Onion Showmaster, colossal in size and sweet-flavoured, to get impressive crops of big onions. Just choose a sunny site and grow in soil that is free-draining. Grow in direct soil or in large pots, incorporating a good compost suitable for vegetable

Key Features

  • Prefers full sun
  • Prefers part shade

Pack Contents: 200x Onion Seeds

Shop with confidence

  • Mastercard
  • PayPal
  • Visa

Description

Grow Onion Showmaster, colossal in size and sweet-flavoured, to get impressive crops of big onions. Just choose a sunny site and grow in soil that is free-draining. Grow in direct soil or in large pots to suit your needs, incorporating a good compost suitable for vegetable growing.

You can even grow this variety to super-size proportions (records have got to 2kg) if you want to present it at a local village show and raise some eyebrows.

For impressive crops we recommend you give your onion plants supplementary lighting from UV lamps. You can still get impressive onions with a sweet flavour similar to Spanish onions, even without lighting and if you are growing for the family, children will still be suitably impressed with the large size.

Growing Calendar

J Jan F Feb M Mar A Apr M May J June J Jul A Aug S Sep O Oct N Nov D Dec
Sow Indoors
Sow Outdoors
Plant Outdoors
Harvest

Delivery

Delivery to outside of the UK

We regret we are unable to deliver any products to non-mainland UK delivery addresses. This includes Europe, Channel Islands, Republic of Ireland, Northern Ireland, USA and Rest of World. We will update our website if this changes.

For more information about our deliveries please click here.