1. Clean and Clear Out

• Remove dead plants and debris: Clear away spent plants, leaves and debris that can harbour pests or encourage disease.
• Clean every surface: Wash walls, glazing and worktops with warm, soapy water.
• Check for pests: Inspect the greenhouse for insects or other pests and address infestations promptly.

2. Inspect and Repair

• Look for cracks and gaps: Check frames, panels and seals carefully for signs of damage.
• Strengthen weak points: Repair or reinforce loose fixings and any damaged panels.
• Replace damaged glazing: Replace broken glass or polycarbonate sheets to reduce heat loss.

3. Improve Insulation

• Use bubble insulation: Fit specialist bubble insulation to interior surfaces.
• Seal doors and vents: Use weatherstripping to limit unwanted draughts.
• Fit a thermal curtain: This provides extra insulation, especially in larger greenhouses.

4. Provide Suitable Heating

• Choose a heater: Consider electric, gas or paraffin greenhouse heaters for colder periods.
• Use a thermostat: Monitor and regulate the temperature efficiently.
• Maximise solar warmth: Keep glazing clean to admit as much daylight as possible.

5. Improve Ventilation

• Install automatic vents: They help manage temperature and humidity.
• Use fans: Fans circulate air more evenly and help discourage mould.

6. Grow Winter Vegetables

• Rotate crops: This helps prevent soil-borne diseases.
• Use raised beds: They give roots added protection during cooler weather.

7. Protect Your Plants

• Use fleece or cloches: Protect sensitive plants on cooler nights.
• Group plants together: A shared microclimate can help retain warmth.
• Avoid overwatering: It helps prevent root rot.

8. Consider Lighting

• Install grow lights: LED or fluorescent lights can supplement natural daylight.
• Position lights correctly: Ensure even coverage for healthy plant growth.

9. Organise Tools and Supplies

• Store tools cleanly: Keep sharp, clean tools in a dry place.
• Restock supplies: Keep seeds, fertiliser and suitable plant-protection products ready.

10. Consider Winter Equipment

• Storm protection: Reduce roof strain during severe weather and strong winds.
• Heat mats: They can support seed germination.
• Use cold frames: They provide extra insulation inside the greenhouse.

11. Carry Out Regular Maintenance

• Monitor temperature and humidity: Use a thermometer and hygrometer.
• Clear roof debris: This helps avoid unnecessary structural strain.
• Reduce condensation: Wipe down wet surfaces regularly.

12. Plan for Emergencies

• Backup power: Keep a generator available for power cuts.
• Spare insulation: Keep extra bubble insulation within reach.