Onion Boreas F1 Seeds
Onion Boreas F1 is a premium overwintering hybrid developed for reliable autumn sowing and early summer harvesting. Bred to establish quickly before winter, this vigorous variety develops a strong root system and healthy dark green foliage that enables plants to withstand cold weather and resume rapid growth as temperatures rise in spring. Its outstanding adaptability makes it an excellent choice for gardeners and allotment growers throughout the UK who want an early crop of high-quality onions before spring-sown varieties are ready.
Boreas F1 produces attractive, uniform round bulbs with firm, well-protected skins and excellent internal quality. The vigorous plants have an upright habit and strong foliage, making them particularly suitable for green harvesting as well as bulb production. Thanks to its dependable winter performance and high productivity, Boreas F1 consistently produces heavy yields under a wide range of growing conditions. Harvested in early summer, the bulbs have a mild yet full onion flavour that is ideal for salads, sandwiches, roasting, soups and everyday cooking. For gardeners wishing to extend the onion season, Boreas F1 is an outstanding complement to spring-sown storage varieties.
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Sowing & Propagation
Sow seeds from late August to September in a sunny, well-drained position. Sow thinly in drills approximately 1 to 1.5 cm deep, spacing rows 25 to 30 cm apart.
Thin seedlings gradually until plants are approximately 8 to 10 cm apart, allowing sufficient room for bulb development. Avoid sowing too early, as excessively large plants entering winter may be more susceptible to bolting.
Growing On
Grow in fertile, well-drained soil enriched with compost or well-rotted organic matter. Choose an open, sunny position where waterlogging is unlikely during winter. Keep the crop weed free throughout the growing season, as onions compete poorly with weeds.
As growth accelerates during spring, water during prolonged dry periods to maintain steady bulb development. A light application of balanced fertiliser in early spring will encourage vigorous growth, while avoiding excessive nitrogen later in the season helps produce firm, well-ripened bulbs. Thanks to its vigorous root system, Boreas F1 performs reliably even under variable weather conditions.
Harvesting
Harvest from June to July, once the foliage naturally begins to yellow and bend over. Lift bulbs carefully on a dry day and allow them to cure thoroughly in a warm, airy location before storing or using fresh.
The attractive round bulbs have firm skins and excellent quality, making them suitable for immediate kitchen use or short-term storage after curing. Regular harvesting prevents bulbs from splitting and ensures the finest flavour and keeping quality.
Key Features
- Premium F1 hybrid
- Excellent overwintering variety
- Autumn sown for early summer harvest
- Strong root system
- Vigorous dark green foliage
- Uniform round bulbs
- Firm protective skins
- High yielding
- Broad adaptability
- Ideal for UK gardens and allotments
Onion Boreas F1 is an excellent choice for gardeners wanting an early, dependable onion crop with outstanding winter hardiness. Its vigorous growth, uniform bulbs and reliable yields make it one of the best overwintering onions for extending the harvesting season in UK gardens and allotments.
Type: Overwintering
Average Size: 60-70 MM
Bulb Shape: Round
Skin Colour: Golden Yellow
Seeds Qty: 120 seeds
Sow in August/September and plant outdoors on well-prepared beds or undercover.
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