1. Clean and Tidy Up

• Remove dead plants and debris: Clear away dead plants, leaves and debris that could attract pests or encourage disease.
• Clean all surfaces: Wash walls, glazing and work surfaces with warm, soapy water.
• Check for pests: Inspect the greenhouse for insects or pests and address any infestation promptly.

2. Inspect and Repair

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

3. Improve Insulation

• Use bubble wrap: Fit specialist bubble wrap to internal surfaces.
• Seal doors and vents: Use weatherstripping to prevent draughts.
• Install a thermal curtain: This adds insulation, especially in larger greenhouses.

4. Ensure Effective Heating

• Choose a heater: Use a suitable electric, gas or paraffin greenhouse heater, following the manufacturer’s ventilation and safety instructions.
• Use a thermostat: Monitor and regulate the temperature efficiently.
• Maximise solar warmth: Keep glazing clean to admit as much sunlight as possible.

5. Improve Ventilation

• Install automatic vents: They help regulate temperature and humidity.
• Use fans: Fans distribute warmth evenly and help prevent mould.

6. Grow Winter Vegetables

• Rotate crops: This helps prevent soil-borne diseases.
• Use raised beds: They offer roots extra protection from cold.

7. Protect Your Plants

• Use fleece or cloches: Protect tender plants from cold conditions.
• Group plants together: A microclimate zone helps retain warmth.
• Avoid overwatering: This prevents 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 crop-appropriate pest-control products on hand, and follow each label.

10. Consider Winter Equipment

• Snow protection where needed: In snow-prone areas, prevent heavy snow from accumulating on the roof.
• Heat mats: They can support seed germination.
• Use cold frames: They provide additional insulation inside the greenhouse.

11. Carry Out Regular Maintenance

• Monitor temperature and humidity: Use a thermometer and hygrometer.
• Remove snow where relevant: This helps avoid structural damage.
• Reduce condensation: Wipe down surfaces regularly.

12. Plan for Emergencies

• Backup power: Plan for a generator during power outages, and operate it outdoors away from doors, vents and other openings.
• Spare insulation: Keep extra bubble wrap close at hand.