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Thompson & Morgan Grow Your Own Vegetables - Onion (Autumn) Senshyu - KC2540

Thompson & Morgan Grow Your Own Vegetables - Onion (Autumn) Senshyu - KC2540

Onion ‘Senshyu’ is a reliable main crop that produces a good yield of semi-globe shaped bulbs with...

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Robert DyasThompson & Morgan Onion (Autumn) Senshyu 500G Prepacked - Brown
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B&QB&Q - Grow Your Own VegetablesOnion (Autumn) Senshyu 500G Prepacked
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Product Information

Full details

The Thompson & Morgan Onion ‘Senshyu’ is an ideal choice for home gardeners looking for a reliable, overwintering crop that yields mild, sweet bulbs. Perfect for both traditional vegetable patches and patio containers, this variety is highly productive and requires minimal maintenance; however, success depends on planting them in firm, well-drained soil with plenty of sunshine.

All features

Model Part NumberKC2540
BrandThompson & Morgan

Extended Product Information

FAQs

When is the best time to harvest Senshyu onions?

Harvesting typically occurs in late June and July once the leaves begin to yellow and fall over.

Can I grow these in containers?

Yes, they are compact and well-suited for patio containers, provided there is adequate drainage.

How should I store them after harvest?

After drying/curing them in a well-ventilated area, store them in a cool, dark, and dry place.

Do I need to fertilize my onions?

If your soil is already fertile and well-prepared with organic matter, additional heavy fertilization is usually not required.

Are these onions frost-hardy?

Yes, as an overwintering variety, they are specifically bred to survive winter temperatures.

Troubleshooting

Bulbs are rotting in the ground

The soil is likely too wet or lacks drainage; improve soil structure with organic matter or grit before planting.

Plants are bolting (flowering early)

This is often caused by extreme temperature fluctuations; ensure sets are planted at the recommended depth and time.

Poor bulb development

Ensure the onions are planted in a location that receives full, direct sunlight throughout the day.

Pros and Cons

Pros

  • Excellent flavor profile for raw eating
  • Reliable performer as an overwintering crop
  • Compact size suitable for pots and containers
  • Easy to store for several months after proper curing

Cons

  • Requires well-drained soil to prevent rotting
  • Must be planted in late autumn to ensure proper development
  • Not suitable for heavy clay soils that hold excess moisture

Setup, Compatibility & Care

  1. Preparation: Choose a site in full sun with fertile, firm, and well-drained soil. If using containers, use a quality multipurpose compost with added grit for drainage.
  2. Planting: Place the sets into the soil at roughly 10cm intervals. The soil should be firm so the onion has resistance while growing.
  3. Watering: Water during dry spells in the spring and early summer, but avoid overwatering, as overly wet soil can lead to bulb rot.
  4. Weeding: Keep the area around your onions free of weeds, as they compete for nutrients and light.
  5. Harvesting: Lift the bulbs carefully with a fork once the foliage has withered. Dry them in the sun or a greenhouse before moving them to storage.

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