Delivery: Despatched from Early March

Stock Status: Pre order

£3.99 each

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Onion Sets - Marshalls Red Fen (Heat Prepared)

  • Catalogue Code 1040-6030
  • Pack Contents: Approx. 75 Onion sets (250g)
  • Royal Horticultural Society Award of Garden Merit
  • Stores well for late autumn and winter
  • Heat-prepared to stop the bolting

A clear winner in our trials, Red Fen’s performance was excellent. It has a round shape and a deep-red colour with a good flavour, ready for you to harvest in August and September.

Marshalls Red Fen stores well and because your bulbs are heat-prepared they are more resistant to bolting. This makes Marshalls Red Fen ideal for planting in early-spring and the plants won't go to seed from the cool weather.

Bulbs are uniform and reliably round which makes for easier growing.


  • RHS Award of Garden Merit
  • F1 Hybrids are crossed varieties that are exceptionally vigorous and longer lasting
  • Will flower well in full sun
  • Varieties that, in our selector's opinion, have exceptional flavour

Growing Calendar for Onion Sets - Marshalls Red Fen (Heat Prepared)

  • Jan
  • Feb
  • Mar
  • Apr
  • May
  • Jun
  • Jul
  • Aug
  • Sep
  • Oct
  • Nov
  • Dec
Plant Outdoors

Onion Sets - Marshalls Red Fen (Heat Prepared) 1040-6030

Prevent and Supress onion white rot

White rot is a disease that affects bulb vegetables like onion and shallots. Once you’re onion crop’s got it, it’s impossible to cure as such and you’ll need to stop growing onions in the same spot for at least eight years. You’ll recognise it at harvest time by fluffy white mould with black speckles that grows around the base of the bulbs.

Have no fear there’s a great way you can prevent it getting to your onions in the first place!

Before planting your onions plant a crop of green manure called Caliente mustard. It’s a great organic means of creating a soil environment that’s uninviting to the disease.

Caliente mustard is a known as a bio-fumigant and once it’s chopped up and dug into the soil, it releases a natural gas that repels the pathogens that cause the rot along with many other soil diseases.

Just sow a pack from any time between March and October for a quick crop before your autumn-planting-crops or sow in November to overwinter for planting crops in spring. Just before it flowers, cut it down and dig well into the soil.

Caliente Mustard single packs can be purchased here.

Caliente Mustard double packs can be purchased here. 


Always had good results with the onions.


Ok so far, just planted them and seem to be doing well


As before they look fine I will reserve judgement until they have grown

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Our products are all grown with the utmost care and to high standards of quality. We regularly check our nursery stock to determine exactly when they will be at the optimum time for despatch.

We despatch our fresh, nursery-grown live plants (including vegetables, trees and flowers) when they are at a stage of growth ready for you, the customer, to plant on at home.

The delivery period shown on your order confirmation indicates when you can expect to receive your order and we will endeavour to despatch your plants in this period within 7-14 days