3 For 2 on Christmas Cropping Potatoes

Enter code XMAPOT at checkout for offer to apply. Hurry! Whilst Stocks Last. Click here to view all varieties on offer.

Buy 1 Get 1 Half Price

When you add this variety to basket. Discount automatically applies at checkout.

Buy 2 Save £10.00 on This Variety

Use discount code POTM06 at checkout. Hurry While Stocks Last!

3 for 2 on Same Variety 9cm Plants

Add 3 of this product to your basket and one will be FREE. Automatically applied at checkout.

Save up to £15 on Bird Care

Click here to view all products included in this offer.

Free Delivery When You Spend £40 on Seed Only Orders

Simply add £40 worth of Seed only products to your basket and your free delivery will be automatically applied during checkout

Get this item FREE when you spend £10.

Add this product to your basket PLUS a further £10 worth of any products. The free item will be automatically discounted during check out. Hurry! Only available for the first 2,023 orders - ends midnight Monday.

Mix 'n' Match Buy Any 3 & Save £20

Add your chosen 3 products to your basket and use code FEED20 at checkout.

Sweetcorn 'Northern Extra Sweet'

Marshalls Garden

Catalogue Code: 10204259

Sale price

Currently Unavailable

Regular price £2.99
One of the earliest supersweet varieties to crop, Sweetcorn ‘Northern Extra Sweet’ produces big golden cobs packed with extra-sweet kernels. Specially bred to cope with unpredictable British weather and cool summers.

Key Features

  • F1 Hybrid variety
  • Prefers full sun

Pack Contents: 25 Seeds

Height: 1.8m


  • One of the earliest-maturing supersweet varieties
  • Big golden cobs packed with very sweet kernels
  • Bred to cope with cooler conditions
  • Ideal for areas with short growing seasons

One of the earliest supersweet varieties to crop, Sweetcorn ‘Northern Extra Sweet’ produces big golden cobs packed with extra-sweet kernels. Specially bred to cope with unpredictable British weather and cool summers, this reliable grower is perfect for northern areas of the UK with shorter growing seasons.

Sow indoors

March-April: Sow 2.5cm (1in) deep in clean pots or module trays of firm, pre-watered compost. Place in warmth 18-21°C (65- 70°F). Keep soil moist at all times.

Sow outdoors

May: Sow seeds 2.5cm (1in) deep in required harvest position. Sow in a block 45cm (18in) apart. Water well to establish plants. Keep soil moist at all times.

Plant out

May: Harden off young plants before planting out in the required harvest position in blocks of 4 plants x 4 plants minimum. Each plant should be 45cm (18in) apart with 45cm (18in) between each row. Protect from frost. Mulch plants and make sure they are stable. If roots begin to show at the surface, cover with more soil.


Do not grow other varieties of sweet corn nearby, as they will cross pollinate with this variety. If planting out before the risk of frost has passed, cover with horticultural fleece. Makes a good windbreak for other plants. Harvest when the tassels at the end of a cob have turned brown and the kernels are creamy when pierced.

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


We know how important your garden is to you. We've listened to our customers and introduced a new improved speedy delivery service, meaning Express delivery comes as standard.

*Orders to Northern Ireland have an automatic additional £3.00 delivery surcharge applied at checkout. 

Order TypeDelivery ChargeDelivery Charge
Seed only order£2.99If you purchase any other items you'll be charged the standard delivery rate of £5.99
Plants, bulbs & gardening accessories£5.99If we need to split your order into separate deliveries we'll only charge one delivery fee
Extra large or long plants & heavy items£9.99These are clearly displayed at check-out
Compost (and any other large or heavy items)£5.99

These items are subject to a delivery multiplier where orders containing 3 or 4 items will be subject to an additional £5.99 for every further 2 items added. This is automatically applied at check-out:

  • 1 - 2 bags £5.99
  • 3 - 4 bags £11.98
  • 5 - 6 bags £17.97
  • 7 - 8 bags £23.96
  • 9 - 10 bags £29.95

If you'd like more than 10 bags of compost please call our Customer Service team who can arrange for a bespoke competitive quote on 01480 774555 (standard network charges apply)

For more detail on specific delivery queries and compost delivery please click here

Delivery to outside of Great Britain

We regret we are unable to deliver any items outside of some Great Britain delivery addresses. This includes Europe, Channel Islands, Republic of Ireland, USA and Rest of World. We will update our website if this changes. 

We now deliver to Northern Ireland, additional delivery surcharges automatically apply at checkout. 

For more information about our deliveries please click here.