RHS Plants
RHS Plants

Shop

Information & Help

My account

onion 'Red Baron'

red onion sets Allium cepa (Cepa Group) Red Baron

RHS award of garden merit
Product Image
A striking and reliable, award-winning, cultivated variety for the kitchen garden, onion 'Red Baron' produces attractive, flattish-round bulbs with deep red skins, crisp white flesh and distinctive red rings running right through to the centre.

This mid to late-season onion is an excellent cropper, producing firm, well-flavoured bulbs with a good storage life once harvested. Its mild yet savoury flavour and eye-catching colour make it a fantastic choice for adding extra character to salads, sandwiches and fresh dishes, while it is equally useful in cooked recipes.

How to care for onion Red Baron:

Plant onion sets in a sunny, open position in fertile, well-drained soil from mid-March to mid-April, spacing them 15cm (6in) apart in rows 30cm (12in) apart, with the tips just showing above the soil surface. Firm the soil around each set after planting to help prevent movement and protect against frost heaving.

Avoid planting in freshly manured ground, and grow onions in a different area each year where possible, avoiding beds that have recently grown onions, garlic, leeks or other alliums to help reduce the risk of pests and diseases.

Keep the soil free from weeds and water during prolonged dry spells while the bulbs are swelling, but avoid overwatering as the bulbs mature.

Lift the onions once the foliage begins to yellow and flop over, usually around August, then allow them to dry thoroughly in a warm, airy place before storing. Store only fully ripened, healthy bulbs in nets, trays or plaits in a cool, dry frost-free location for use throughout autumn and winter.
Eventual height:
0.3m
Eventual spread:
0.1m
Position:

Full sun

Rate of growth:

Average

Soil:

Moderately fertile, moist, well-drained soil

Hardiness:

Fully hardy

Product options

1
Delivery options (pick your preferred option at checkout)
Bulbs (only)£4.99

Goes well with
Add to wishlist

Raised bed

£56.99
View details
Add to wishlist

Mini raised bed

£42.99
View details
Add to wishlist

DeWit brass tipped dibber

£26.99
View details
Add to wishlist

Vegetable netting sacks - pack of 3

£5.99
View details
Become an RHS Member today and save 25% on your first year
Join now

Keep in touch

View our Privacy Policy
Contact us
Cookies
Terms
Privacy

© RHS Enterprises Limited 2026
Registered in England & Wales No. 01211648. | VAT No. GB461532757 | Registered Office: 80 Vincent Square, London, SW1P 2PE.

All sales help fund the charitable work of the RHS.