Heat Treated Onion Sets

Make growing your own onions a breeze with Mr Fothergill's heat-treated onion sets. The best choice for beginners, or an easy shortcut for experienced gardeners, heat-treated onion sets grow and establish much more rapidly. This means larger bulbs and higher yields, with virtually no risk of premature ‘bolting’.

Expertly heat-treated for several months, these onion sets will arrive at your door ready for immediate planting. Choose from many popular varieties, including the AGM-winning Red Baron, known for its beautiful crimson-skinned bulbs. Beginners will appreciate our reliable Stuttgarter Riesen sets, which boast great disease resistance. Discover our full range of heat-treated onion sets below.

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Onion (Heat Treated) Red Baron AGM Sets
Buy 4 packs Save £5
Heat Treated Onion Set Collection
Buy 4 packs Save £5
Onion (Heat Treated) Cupido Sets
Buy 4 packs Save £5

Sale price£5.85
Onion (Heat Treated) Rosanna Sets
Buy 4 packs Save £5

Sale price£6.35
Heat Treated Onion Stuttgarter RiesenHeat Treated Onion Stuttgarter Riesen
Buy 4 packs Save £5

Why Choose Our Heat Treated Onion Sets?

Onions are incredibly versatile: a staple in everything from soups and sandwiches to pasta sauces. Growing your own lets you enjoy the freshest bulbs possible, with an unbeatable crisp texture and home-grown flavour.

Heat-treated onion sets are quicker and easier to grow than onion seeds, making them great for busy gardeners. The bulbs are carefully heated and cooled over several months – a natural process which kills the sprout stalk. This leads to faster growth and bigger onions and also prevents premature running to seed (‘bolting’). 

Our heat-treated onions can be planted directly in the ground or grown in pots. Pair them with bushy tomato plants or dwarf beans for a productive container vegetable garden.