A UK greenhouse extends the growing season by 6-8 weeks at each end. January and February focus on cleaning and starting chillies at 18-21C with a heater. March to May is peak sowing: tomatoes, peppers, cucumbers, and French beans. June to August requires daily ventilation above 25C and twice-weekly feeding. October and November are for insulating and planting winter salads.
Key takeaways
- A greenhouse adds 6-8 weeks to the UK growing season at each end
- Start tomatoes, peppers, and aubergines indoors from February at 18-21C
- Ventilation is critical from June to August: open vents above 25C
- Clean and insulate in October and November to protect overwintering crops
- A 2kW heater keeps a greenhouse frost-free for early and late sowings
- Use staging to double your growing space for seed trays and young plants
greenhouse growing calendar month by month sowing harvesting vegetables greenhouse gardening
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
