Calabrese is the type of broccoli that produces large green heads, a reliable crop for summer and autumn harvests.
When to Sow
- Sow indoors Feb–Apr, plant out Apr–Jun.
- Later sowings possible for autumn harvests.
How to Grow
- Plant in firm, fertile soil with good drainage.
- Space 45cm apart.
- Water regularly and protect from cabbage root fly with collars.
Harvesting
- Main head ready in Jul–Oct depending on sowing.
- Cut central head, then side shoots will follow.
Polytunnel Growing Tips
- Earlier sowings under cover give a head start.
- Protects against pigeons and flea beetle.
- Be mindful of ventilation to avoid too much heat.
Quick Tips Recap
- Sow: Feb–Apr
- Spacing: 45cm
- Harvest: Jul–Oct
Polytunnel advantage: Earlier crops, pest protection
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