Winter onion · hybrid variety · South Korea
Coreon 1
A Korean overwintering onion grown in Polish conditions. Distribution and field trials are run by Onix sp. z o.o.
- Species
- Allium cepa L.
- Variety type
- Overwintering hybrid
- Harvest
- Around 15 June
- Origin
- Republic of Korea
What sets Coreon 1 apart
Breeder data — Seedon Co., LtdStrong, upright plant
Dark green leaves growing upright, plant height around 70 cm, 8–10 leaves per plant. Strong vigour and good root establishment. The upright habit improves air circulation in the crop.
Approx. 8.5 cm and 350 g
Tall, cylindrical shape. A thick outer skin and firm, dense bulb give excellent storage capability.
Approx. 11.5° Brix
High sugar content with moderate pungency and a crisp texture — an onion of high eating quality.
Cold, fungi, splitting
Excellent cold tolerance and strong resistance to fungal diseases, particularly Fusarium wilt. Relatively stable against bolting and bulb splitting.
Seed material
Data from the lot documents- Species
- Allium cepa L.
- Variety
- Coreon 1
- Seed category
- Certified seed
- Certification no.
- 02-0011-2013-49
- Harvest / packing year
- 2024 / 2026
- Purity
- 100%
- Germination
- 95–98%
- 1000-seed weight
- 3.5 g
- Country of origin
- Republic of Korea
- Moisture
- 8–10%
- Distributor in Poland
- Onix sp. z o.o.
The seed is bred and produced by Seedon Co., Ltd (Daegu, Republic of Korea) and imported into Poland with a phytosanitary certificate issued by the Korean plant quarantine service.
The variety is covered by official testing carried out by COBORU, the Polish Research Centre for Cultivar Testing, and the seed has been cleared for marketing in Poland.
The full documentation — the COBORU authorisation and the phytosanitary certificate for the lot — is available on request. Call us and we will send it along with the terms of cooperation.
Growing cycle
Mid-to-late maturing · open-field cultivationSowing
Around 25 AugustKeep to the sowing date. Delayed sowing means poorer overwintering, more missing plants, smaller bulbs and lower yield.
Before winter
About 4 leavesPlants at this stage before winter sets in are the condition for a high yield.
Harvest
Around 15 JuneHarvest falls outside the peak supply of summer onion, which opens a selling window at a higher price.
Site and soil
Well-drained sandy loam, pH 6.2–7.2. In-row spacing of 12–14 cm — lower density gives better air circulation and more uniform bulbs.
Irrigation
Watering thoroughly right after sowing decides germination and uniformity. After overwintering, irrigate without delay. Water less often but generously — too frequent irrigation causes waterlogging and disease. In midsummer irrigate at dawn or dusk, not during the midday heat.
Fertilisation
Apply post-winter topdressing as early as possible, in the second half of March, and complete the final application by the end of April. Nitrogen and potassium at roughly a 2:1 ratio.
What to watch for
Excess nitrogen, or applying it too late, weakens standing ability, delays harvest and markedly reduces storage quality. On sites with heavy snowfall, dig deep furrows so that water does not stand in spring.
Distribution contact
Onix sp. z o.o. — distributor of Coreon 1