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Rijnsburger has large globular bulbs. A mid to late summer round onion with yellow brown, firm skin, excellent for storing.Onions have anti-bacterial and antiseptic properties, and are also believed to lower blood pressure.
Sow the Rijnsburger onion seeds from January indoors in good seed compost. Lightly cover the seeds, and water well. Can be sown outside from late March-April, directly into well-prepared soil.
Germination takes up to 20 days at 15-20 Celsius. Check out in details how to grow onions from seed: Onion Growing Guide
Prick out the seedlings and plant them into individual pots when large enough to handle. Make sure that the bulb part of the plant is not covered with compost. Move the plants into a coldframe or unheated greenhouse, to acclimatize to outdoor conditions before planting out to final position. Plant 30-40 cm apart in rich, fertile soil.
Thin out if sown direct outdoors when seedlings emerge and keep the rows weed free. Water in the summer during dry spells. When the leaves start to yellow, allow the onions a further two weeks, then lift and store in a cool dry place.