How to Grow Sweetcorn


  • Sowing Instructions
  • How to Transplant
  • Crop Maintenance
  • How to Harvest

Sowing Instructions

  • Sowing Time: Mid spring. Important that seeds are kept warm
  • Sowing Location: Indoors, under cover & grow in greenhouse
  • Sow in 9cm pots or fibre pots, sowing 1 seed per pot soaking compost
  • Sow seeds 2cm deep, placing seed vertically in compost
  • Place pots in a heated propagator, setting to 21°C
  • Keep pots moist at all times

How to Transplant

  • Once 10cm tall you can transplant (roughly 6 weeks after sowing)
  • Harden of your sweetcorn by acclimatizing to the cold by leaving outside for a few hours a day
  • Transplant young seedlings into greenhouse soil
  • Space 50cm apart
  • Plant in blocks not rows
  • Soil: Soil must be warm before sowing, use a garden cloche to warm soil prior to sowing
  • Well drained & very fertile soil is preferred
  • Improve the soil by digging in some compost or manure

Crop Maintenance

  • Keep moist
  • Protect crops against slugs
  • Support plants using canes, garden twine or tomato supports

How to Harvest

  • Harvest sweetcorn once tassels have turned brown

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