Onion Stuttgarter Riesen

What Onion Stuttgarter Riesen is

Onion Stuttgarter Riesen (Allium cepa L.) is a biennial crop grown for harvest as early as the first year, from the onion family (Amaryllidaceae). This variety is traditionally the most widely grown and best-known variety in the hobby sector.

The onion has a beautiful round shape and, once fully grown, is firm and flattened with yellow skins.

It gives high yields and has an excellent flavour. Under suitable conditions, it will keep for a long time after harvest.

The plants reach about 20 cm tall.

Onions contain large amounts of provitamin A, vitamins C, E, K and above all B vitamins, as well as calcium and potassium salts, which de-acidify the body.

The essential oils contained in onion juice have medicinal properties.

Onion from seed is the cheapest and surest way to a large harvest — for spring onions, onion sets or big bulbs for winter.

Key features

• Measured germination rate of the batch: 91%
• Seeds per packet: 148–201 pcs (0.7 g)
• Seed origin: France
• Sowing: February – April; direct or seedlings
• Harvest: July – September
• Position: sunny spot

When to sow Onion Stuttgarter Riesen

Onion Stuttgarter Riesen seeds are sown in February – April. Harvest in July – September. The months are a guide for a temperate climate — in warmer areas sow 1–2 weeks earlier, in cooler or upland areas, later.

How to sow and grow Onion Stuttgarter Riesen

• Sowing method: direct or seedlings
• Depth: 1–1.5 cm
• Spacing: 8–10 cm in the row, 25–30 cm between rows
• Germination: 10–14 days at 15–20 °C
• Position: sunny spot

Sow onion seeds in spring in rows 30-40 cm apart and at a depth of 1-2 cm. The soil should be well-drained, sufficiently moist and rich in humus and nutrients. After emergence the plants should not be too dense, so they are thinned to a distance of about 25 cm. Onions are ready for harvest from the end of July to the first half of September.

Sow in early spring in loose, weed-free soil. Weed regularly — onions do not tolerate competition. Stop watering 3–4 weeks before harvest.

Harvest and use

The bulbs are harvested when the neck softens and the leaves flop over; dry them in the shade for 2 weeks before storing.

Frequently asked questions

When should Onion Stuttgarter Riesen be sown?

The recommended sowing months are February – April. Sowing method: direct or seedlings.

How many seeds are in the packet?

The packet contains 148–201 seeds, pack size 0.7 g.

What is the germination rate of the seeds?

The measured germination rate of this batch is 91%. The test was carried out under controlled laboratory conditions; in the field, emergence depends on soil, temperature and moisture.

Can a large onion be grown from seed in one year?

Yes — with early sowing (February–March) for seedlings or direct, most varieties form bulbs in the very first year.