Winter Onion ‘Augusta’ – Reliable Overwintering Onion for Early Harvests

‘Augusta’ is a robust winter-hardy onion variety bred for autumn sowing and early summer harvests. It produces uniform, round, golden-yellow bulbs with firm flesh and excellent flavour. Ideal for overwintering in mild and temperate regions, it’s resistant to cold, bolting, and disease, ensuring a dependable crop even after harsh winters. Perfect for gardeners who want to extend the onion season with early, high-quality bulbs ready in late spring.

Key Features

● Cold-hardy: specially bred for autumn sowing and overwintering

● Early maturity: ready to harvest up to 4–6 weeks before spring-sown onions

● Uniform bulbs: medium to large size, round, golden-brown skins

 ● Excellent flavour: mild and sweet taste, suitable for fresh use or cooking

● Reliable performance: strong roots and good disease resistance

How to Sow & Grow ‘Augusta’ (UK)

Direct outdoors: VIII–IX (August–September) for overwintering crops

Plant out / thin seedlings: IX–X (September–October)

Harvest: V–VI (May–June) the following year

Germination temperature: 10–20 °C (50–68 °F)

Average germ time: 10–14 days

Depth: 1 cm (½ in)

Light required: Yes

Moisture: Keep evenly moist but not waterlogged

Environment: Full sun

Soil type: Fertile, well-drained, slightly sandy or loamy; pH 6.0–7.5

Plant spacing: 10–15 cm (4–6 in) between plants; 25–30 cm (10–12 in) between rows

Season: Biennial (grown as annual overwintering crop)

Height: 35–45 cm (14–18 in)

Bulb colour: Golden yellow

Sowing & Growing Tips 

● Sow directly outdoors in well-prepared beds or raised borders from late August to mid-September.

● Thin seedlings to final spacing before winter to avoid overcrowding.

● Mulch lightly before frosts to protect young plants in colder regions.

● Water only during dry autumn spells – overwatering can weaken plants.

● Feed with a balanced fertiliser in early spring to encourage strong growth.

● Harvest early: bulbs mature in May–June, weeks before spring-sown varieties.

 ● Do not store long term – use fresh through early summer.

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