UK greenhouses can produce crops in all 12 months. January starts with forced rhubarb and early lettuce. February is the time for tomato and pepper seeds at 18-21C. March brings half-hardy annuals and cucumbers. Summer harvests run June to September with tomatoes, cucumbers, peppers, and melons. October to December shifts to winter salads, forced hyacinth bulbs, and overwintering broad beans. A heated greenhouse extends the season by 8-10 weeks at each end.
Key takeaways
- A greenhouse produces crops in every month of the year with the right planning
- February to April is the peak sowing period for tomatoes, peppers, and cucumbers
- Summer harvests of tomatoes, cucumbers, and melons run from June to September
- Winter salads like lamb's lettuce and mizuna crop from October to February
- Forced rhubarb and spring bulbs give you fresh produce even in January
- Automatic roof vents and a backup heater protect crops from frost and overheating
greenhouse planting calendar greenhouse growing vegetables year-round growing grow your own
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
