Thompson & Morgan Sweetcorn - Lark F1

Sweetcorn 'Lark' is a midseason tendersweet variety renowned for its exceptional sweetness and ten...

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Thompson & Morgan Sweetcorn 'Lark' F1 is an ideal choice for home gardeners looking for a reliable, high-yield crop that bridges the gap between traditional and supersweet varieties. This midseason cultivar is highly regarded for its tender, thin-skinned kernels and exceptional sweetness, and unlike many other sweetcorn types, it does not require isolation during growth. While it offers superior germination rates, gardeners should be prepared for its impressive final height of 200cm, which requires adequate space and protection from strong winds.

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Model Part NumberLark F1
BrandThompson & Morgan

Extended Product Information

FAQs

Do I need to grow this in isolation?

No, 'Lark' F1 does not require isolation and can be grown alongside other sweetcorn varieties.

How deep should I plant the seeds?

Sow your seeds approximately 2cm deep in high-quality, moist seed compost.

How long does germination take?

Typically, you can expect germination within 7-10 days if kept at the correct temperature.

How much space does each plant need?

Space plants 35cm apart in both rows and between rows to ensure proper pollination and air circulation.

What is the mature height of the plant?

The plants will grow to a height of approximately 200cm (79 inches).

Can I plant this directly outdoors?

It is recommended to start indoors in pots to ensure the seedlings are robust before moving them outside once frost risks have cleared.

Troubleshooting

Seeds fail to germinate

Ensure temperatures are consistently maintained between 18-24°C and that the compost remains moist but not waterlogged.

Poorly filled cobs

This is often due to poor pollination. Ensure plants are in a block formation rather than a single line, and try shaking plants gently to distribute pollen.

Pros and Cons

Pros

  • Does not require isolation from other corn varieties
  • Superior germination reliability compared to other varieties
  • Excellent flavor profile with tender kernels
  • Versatile culinary applications including grilling and steaming

Cons

  • Reaches a tall height of 200cm, potentially requiring wind protection
  • Requires careful hardening off before outdoor transplanting
  • Strictly sensitive to frost conditions

Setup, Compatibility & Care

  1. Starting Indoors: Sow seeds 2cm deep in 7.5cm pots using free-draining compost. Maintain temperatures between 18-24°C using a propagator or plastic bag.
  2. Acclimation: Once germinated, gradually expose seedlings to outdoor temperatures for 10-14 days before planting to reduce transplant shock.
  3. Transplanting: Plant outdoors only after all risk of frost has passed. Ensure the soil is well-raked and free of large stones.
  4. Care: Keep the area weed-free and water consistently during dry spells. As plants grow tall, monitor for extreme wind exposure.
  5. Pollination Aid: If the weather is calm when tassels appear, gently shake the stems to help distribute pollen across the block.